Thèses sur le sujet « TWO ELECTRON ATOMS »
Pour voir les autres types de publications sur ce sujet consultez le lien suivant : TWO ELECTRON ATOMS.
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les 23 meilleures thèses pour votre recherche sur le sujet « TWO ELECTRON ATOMS ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Parcourez les thèses sur diverses disciplines et organisez correctement votre bibliographie.
1
Armstrong, G. S. J. « Electron dynamics of one- and two-electron atoms in intense laser fields ». Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546004.
Texte intégral
2
Vaillant, Christophe Louis J. « Long-range interactions in one- and two-electron Rydberg atoms ». Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10594/.
Texte intégralRésumé :
We present calculations of long-range interactions in Rydberg atoms, with a focus on the dipole-dipole interactions of strontium Rydberg states. The growing use of Rydberg states in the field of cold atoms necessitates a more detailed understanding of the effects of dipole-dipole interactions, which are currently being investigated in a number of research groups worldwide. Calculations of long-range interactions in Rydberg states of caesium, cal- cium, rubidium, strontium and ytterbium are presented. By taking the one active electron approximation we develop consistent models of these long- range interactions, and construct a survey of the Rydberg state dipole-dipole interactions and quadrupole-quadrupole interactions. We compare the inter- actions between series and between atoms, highlighting the importance of certain series for applications suggested in previous works. In order to include two-electron effects in the description of dipole-dipole interactions in divalent atoms, we use multichannel quantum defect theory (MQDT) to develop models of the Rydberg series of strontium. We use an empirical reactance matrix formalism, where the reactance matrix is fitted to reproduce experimentally measured values of the bound state energy levels. Models are found for all series of strontium with L ≤ 3. We extend the MQDT formalism to the description of the natural radiative lifetimes of strontium, where the perturbers are found to have a large quenching effect on these lifetimes. By incorporating the MQDT description of the Rydberg states of strontium into the calculation of dipole-dipole interactions, we find a spin-forbidden two-atom resonance in the 3D2 states of strontium. We consider a one- dimensional lattice of strontium atoms, and find that the internal dynamics of the Rydberg atoms demonstrates spin transport for large lattice spacings and a separation of the spin and total angular momentum dynamics for small lattice spacings. Spin-angular momentum separation (analogous to spin-charge separation in condensed matter) in strontium Rydberg atoms may have uses in the investigation of one-dimensional Fermi gases and their description using Luttinger liquid theory.
3
Persaud, Michael Alan. « Doppler-free two-photon spectroscopy of one electron atoms using pulsed lasers ». Thesis, University of Southampton, 1991. https://eprints.soton.ac.uk/361600/.
Texte intégralRésumé :
In two independent experiments, frequency doubled pulse amplified dye laser light has been used in performing Doppler-free two-photon spectroscopy of the 1S½−2S½ transition in atomic hydrogen and muonium. Absolute values gained for the 1S½−2S½ transition frequencies were 2466 061 416(9) MHz and 2455 528 964(72) MHz for hydrogen and muonium respectively. Values for the ground state Lamb shifts were inferred to be 8171(9) MHz for hydrogen and 8079(73) MHz for muonium. All results were found to be in agreement with current quantum electrodynamic (QED) theory. Assuming QED theory to be accurate, then the hydrogen experiment yielded a new value for the Rydberg constant of 109 737 31.58(4) m−1, which is in agreement with other independent measurements. A separate experiment demonstrated a novel and general technique for efficiently frequency doubling mode-locked laser light, based on second harmonic generation inside an actively stabilised external ring enhancement cavity. When applied to a synchronously pumped mode-locked dye laser, over 100mW average power of tunable light around 243nm was available from the system corresponding to crystal conversion efficiencies in excess of 55%. A simple theoretical model successfully described the performance of this system. FM sideband frequency stabilisation of mode-locked lasers is treated both theoretically and experimentally. For the mode-locked dye laser, a frequency stability to within 500kHz relative to a reference interferometer was routinely possible. The frequency stabilised tunable uv light is ideal for performing Doppler-free coherent multiple pulse spectroscopy and may find application in the synchronous pumping of optical parametric oscillators or in selectively breaking chemical bonds.
4
Yamamoto, Ryuta. « A Quantum Gas Microscope of Two-electron Atoms with Fluorescence and Faraday Imaging ». Kyoto University, 2016. http://hdl.handle.net/2433/217727.
Texte intégral
5
Hofbrucker, Jiří [Verfasser], Stephan [Gutachter] Fritzsche, Alejandro [Gutachter] Saenz et Eva [Gutachter] Lindroth. « Two-photon ionization of many-electron atoms / Jiří Hofbrucker ; Gutachter : Stephan Fritzsche, Alejandro Saenz, Eva Lindroth ». Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1212509110/34.
Texte intégral
6
Gorman, Timothy Thomas. « Attosecond Probing of Electron Dynamics in Atoms and Molecules using Tunable Mid-Infrared Drivers ». The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu15428283538078.
Texte intégral
7
Filippin, Livio. « Relativistic study of electron correlation effects on polarizabilities, two-photon decay rates, and electronic isotope-shift factors in atoms and ions : ab initio and semi-empirical approaches ». Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/261670.
Texte intégralRésumé :
The first aim of this thesis is to perform relativistic calculation of atomic and ionic polarizabilities and two-photon decay rates. Hydrogenic systems are treated by the Lagrange-mesh method. The extension to alkali-like systems is realized by means of a semiempirical-core-potential approach combined with the Lagrange-mesh method. The studied systems are partitioned into frozen-core electrons and an active valence electron. The core orbitals are defined by a Dirac-Hartree-Fock (DHF) calculation using the GRASP2K package. The valence electron is described by a Dirac-like Hamiltonian involving a core-polarization potential to simulate the core-valence electron correlation. Polarizabilities appear in a large number of fields and applications, namely in cold atoms physics, metrology and chemical physics. Two-photon transitions are part of a priori highly unlikely processes and are therefore called forbidden radiative processes. Experimental situations report decays from metastable excited states through these channels. Long lifetimes were measured for highly charged Be-like ions in recent storage-ring experiments, but their interpretation is problematic. The study of the competition between forbidden (one-photon beyond the dipole approximation, or multi-photon) and unexpected (hyperfine-induced or induced by external magnetic fields) radiative processes is all obviously relevant. The second aim of this thesis is to perform relativistic ab initio calculations of electronic isotope-shift (IS) factors by using the multiconfiguration DHF (MCDHF) method implemented in the RIS3/GRASP2K and RATIP program packages. Using the MCDHF method, two different approaches are adopted for the computation of electronic IS factors for a set of transitions between low-lying levels of neutral systems. The first one is based on the estimate of the expectation values of the one- and two-body nuclear recoil Hamiltonian for a given isotope, including relativistic corrections derived by Shabaev, combined with the calculation of the total electron densities at the origin. In the second approach, the relevant electronic factors are extracted from the calculated transition shifts for given triads of isotopes. These electronic quantities together with observed ISs between different pairs of isotopes provide the changes in mean-square charge radii of the atomic nuclei. Within this computational approach for the estimation of the mass- and field-shift factors, different models for electron correlation are explored in a systematic way to determine a reliable computational strategy, and to estimate theoretical error bars of the IS factors.Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
8
Pal, Rupsi. « Development of non-linear coupled-cluster single-double method and calculation of properties of atoms with one and two valence electrons ». Access to citation, abstract and download form provided by ProQuest Information and Learning Company ; downloadable PDF file, 121 p, 2009. http://proquest.umi.com/pqdweb?did=1654501301&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texte intégral
9
Dulieu, Olivier. « Etude des systemes atomiques a deux electrons externes par la methode de fonction d'onde correlee de pluvinage : application a l'etude des ions alcalins negatifs ». Paris 6, 1987. http://www.theses.fr/1987PA066350.
Texte intégralRésumé :
Par cette methode, etude detaillee des etats excites et autoionisants de l'atome me; comparaison aux donnees experimentales et a des calculs par d'autres methodes. Extension de la methode de l'analyse a des systemes a deux electrons externes : li**(-), na**(-), k**(-)
10
Ott, Christian [Verfasser], et Thomas [Akademischer Betreuer] Pfeifer. « Attosecond multidimensional interferometry of single and two correlated electrons in atoms / Christian Reinhold Ott ; Betreuer : Thomas Pfeifer ». Heidelberg : Universitätsbibliothek Heidelberg, 2012. http://d-nb.info/117978569X/34.
Texte intégral
11
Gao, Junwen. « Two-electron processes and correlation effects in ion-atom collisions : a close-coupling approach at intermediate energies ». Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS117.
Texte intégralRésumé :
Cette thèse présente une théorie non perturbative pour décrire les processus multi-électroniques intervenant au cours des collisions ion-atome. Le traitement choisi est semiclassique en ce sens que le mouvement relatif cible-projectile est décrit par des trajectoires classiques (mouvement rectiligne uniforme), tandis que la dynamique électronique est traitée quantiquement, en résolvant de manière non perturbative l’équation de Schrödinger dépendante du temps. Cette approche théorique a été codée au cours de la thèse dans une nouvelle version du code informatique à deux électrons actifs et mise en œuvre à l'étude de plusieurs systèmes de collision. Outre le développement long et complexe et les tests du code, les trois dernières années ont été spécialement consacrées à la compréhension de la physique d'événements spécifiques de diffusion de particules lourdes. Nous avons entrepris l’étude de trois types de systèmes de collision : par ordre d’apparition dans cette thèse, (i) collisions ion-ion faiblement chargé avec une extrême importance de la corrélation électronique (H+ - H-), (ii) collisions entre projectiles multiplement chargés et atome (C4+ - He) et (iii) collisions He+ - He avec un traitement très original prenant en compte des trois électrons dans la dynamique. Le choix de ces systèmes était guidé sur des systèmes benchmark pour lesquels des résultats expérimentaux et théoriques étaient disponibles, et présentant des questions ouvertes, liées par exemple à de forts désaccords entre les données existantes.Systématiquement, nous avons essayé de produire des résultats avec une convergence contrôlée permettant des interprétations physiques originalesThis thesis presents a non perturbative theory to describe multi-electronic processes occurring in the course of ion-atom collisions. The treatment is semiclassical in that the relative target-projectile motion is described by classical straight-line constant velocity trajectories, while the electronic dynamics is treated quantum mechanically, by solving non perturbatively the time-dependent Schödinger equation. The treatment has been implemented in a new version of two-active-electron computer code. Besides the long and complex development and tests of the code, the last three years have been especially devoted to understanding of the physics of specific heavy particle scattering events. We have undertaken the study of three collision systems with various features: (i) low charge ion-ion collisions with an extreme importance of electronic correlation (H+ + H− collisions), (ii) multiply charged projectile-atom collisions (C4+ + He) and (iii) He+ + He collisions with the dynamical treatment of the three electrons. Our guideline was always to target systems for which experimental and theoretical results were available (at least in some energy domain), with still open questions, related, for example, to strong disagreement between the various data. We have tried as much as our computing resources and allowed it to produce results with controlled convergence. These investigations were carried out in a very wide, up to three decades, energy domain with same collision description (i.e. same basis sets), which brought continuity and coherence on the predictions and the interpretations of the results and of the underlying mechanisms giving rise to the processes considered
12
Spencer, Joseph. « Vibrational and electronic excitations of two atom diameter mercury telluride nanowires studied by resonance Raman spectroscopy ». Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/409712/.
Texte intégralRésumé :
This thesis presents the results from a temperature dependant resonance Raman spectroscopy study of HgTe extreme nanowires embedded within SWCNTs. Extreme nanowires are nanowires at the absolute limits of the nanoscale, in this case, just 1-2 atoms in diameter. This work demonstrates that due to the effect of quantum confinement on the electronic wavefunction and the reordering of atoms creating a new allotrope of HgTe never previously measured, new physics of 1D materials is observed. In this body of work we perform resonance Raman spectroscopy experiments with excitation photon energies of 1.65eV to 1.90eV and sample temperatures between 4-300K on an ensemble of HgTe filled single-walled carbon nanotubes. The Raman spectra are analysed and show that 1D HgTe within a SWCNT exhibits new Raman peaks not associated with modification of the bulk material. We couple the Raman results with HRTEM and utilise symmetry arguments to propose two of the fundamental vibrational modes at 47cm⁻¹ and 52cm⁻¹ are associated with vibrations with Bg and Ag symmetry respectively. Most strikingly, our results indicate a decrease in the rate of Raman scattering as a function of increasing temperature, not clearly in-line with the expected behaviour of Raman scattering due to an increase in the thermal phonon population. Through detailed analysis of temperature dependent resonance Raman data we can understand this effect in terms of broadening of the linewidth of the optical transition. We set out the evidence that this result can be understood by a model in which the resonance’s broadening is dominated by the coherence lifetime broadening. This allows us to determine the coherence lifetime of the underlying optical transition: 9fs at 295K and 18fs at 50K. The results are compared with similar results on carbon nanotubes which suggests that the optical transitions responsible for the Raman resonances are excitonic and is likely general to small diameter nanowires. A review of existing and comparable Raman measurements on such nanowires is presented and the implications of the main results in this thesis are discussed in terms of a general interest to the wider physics community.
13
Moudden, Ali. « Etude comparative des series **(1)s : :(0), **(1)d ::(2) du zinc et du magnesium ». Caen, 1987. http://www.theses.fr/1987CAEN2043.
Texte intégralRésumé :
Etude par fluorescence des durees de vie radiatives et des probabilites de transition vers l'etat de resonance (ms mp)**(1)p::(1) du zinc et du magnesium, montrant de fortes perturbations des series **(1)d::(2) et **(1)s::(0). Mise en evidence par des calculs theoriques des melanges tres important avec la configuration (mp**(2))
14
Janke, Svenja Maria. « Theoretical Description of Hydrogen Atom Scattering off Noble Metals ». Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-87A3-4.
Texte intégral
15
Reynal, François. « Etude des processus non-linéaires dans les atomes complexes en interaction avec un champ XUV intense et bref ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 2012. http://tel.archives-ouvertes.fr/tel-00748138.
Texte intégralRésumé :
Etude th'eorique de l'interaction entre un atome à deux ou trois électrons actifs et un champ laser de fort éclairement (10^13 à 10^15 W.cm−2) et de durée d'impulsion ultra-brève (femto à attoseconde) dans le domaine spectral XUV. Notre approche est basée sur la résolution de l' équation de Schrödinger dépendante du temps (ESDT). Nous utilisons une méthode spec- trale pour résoudre l'ESDT avec des fonctions d'onde construites sur des B- splines. Nous étudions particulièrement la double ionisation à deux photons (TPDI) de l'hélium dans l'état fondamental ainsi que dans l' état excité 1s2s. Plusieurs modèles sont d'eveloppés pour traiter le cas des impulsions ultra- brèves. Enfin nous abordons la TPDI du Lithium, système à trois électrons actifs. Nous comparons la double ionisation à deux photons dans le régime séquentiel pour Li et He(1s2s) ; le régime direct est également abordé
16
Li, Chengjun. « Experimental study on electron impact double ionization dynamics for atomic and small molecular targets at intermediate incident energy ». Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00867037.
Texte intégralRésumé :
In this work, different double ionization (DI) mechanisms of various atomic and molecular targets by electron impact at different intermediate incident energies have been studied by so-called (e, 3-1e) and (e, 3e) experiments. Four and five fold differential cross sections in angle and in energy have been measured and analyzed in a coplanar geometry. The experimental measurements are compared with both first order and second order theoretical model calculations. The results shows that the theories including second order mechanism (such as Two Step 2, TS2) are generally in better agreement with the experimental data than these only including first order mechanisms (such as Shake Off and Two Step 1). This demonstrates that under present kinematics, second order mechanism plays an important role or even dominates over first order mechanisms. Besides, all DI results are compared with the predictions of TS2 kinematical analysis developed by Lahmam-Bennani et al (2010). Most of the structures shown in the measured angular distribution can be correctly explained by the TS2 kinematical analysis predictions. Besides, we extend this model by including the recoil contribution in each step. Some structures which cannot be explained by the previous model are well explained by the extended TS2 kinematical model. The isoelectronic target structure influence in DI is investigated preliminarily. The (e, 3-1e) results on Ne and CH₄ indicate the differences under same kinematics. The data analysis is underway.
17
cheng, yiting, et 陳宜婷. « two electron atoms structure ». Thesis, 1996. http://ndltd.ncl.edu.tw/handle/26770800408018280449.
Texte intégral
18
Shuman, Edward Somerville. « Structure and dynamics in two-electron atoms / ». 2007. http://wwwlib.umi.com/dissertations/fullcit/3286969.
Texte intégral
19
Eiglsperger, Johannes [Verfasser]. « Highly doubly excited states of two-electron atoms : spectra, cross sections and localization properties / Johannes Eiglsperger ». 2010. http://d-nb.info/1003872085/34.
Texte intégral
20
CAPPELLINI, GIACOMO. « Two-orbital quantum physics in Yb Fermi gases exploiting the 1S0 -> ; 3P0 clock transition ». Doctoral thesis, 2016. http://hdl.handle.net/2158/1045924.
Texte intégralRésumé :
La tesi riguarda lo studio di fenomeni di fisica a due orbitali con atomi fermioni di itterbio. In particolare vengono studiate e caratterizzate le interazioni tra atomi in due stati elettronici e di spin nucleare diverso e come sia possibile controllare la forza di tale interazioni tramite "risonanze di Feshbach orbitali". Nella tesi viene inoltre illustrata la realizzazione di un laser ultrastretto atto ad eccitare la transizione verso lo stato metastabile 3P0 degli atomi di itterbio, stabilizzato sul lungo termine su un link in fibra ottica tra il Laboratorio Europeo di Spettroscopie Nonlineari (LENS) di firenze all'Istituto Italiano di Ricerca Metrologica (INRIM) di Torino. - This thesis reports on the study of two-orbital physics with fermionic ytterbium atoms. In particular, we study the interactions between atoms in different electronic and nuclear spin states, as well as the possibility to tune the strenght of such interactions through an "orbital Feshbach resonance". The thesis also illustrates the realization of an ultranarrow laser system able to excite the transition to the mestastable 3P0 state of ytterbium, frequency-stabilized on the long term to an optical fiber link that connects the European Laboratory for Nonlinear Spectroscopy (LENS) in Florence to the italian National Metrology Institute (INRIM) in Turin.
21
Kim, Moochan. « Problems on Non-Equilibrium Statistical Physics ». Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007.
Texte intégralRésumé :
Four problems in non-equilibrium statistical physics are investigated: 1. The
thermodynamics of single-photon gas; 2. Energy of the ground state in Multi-electron
atoms; 3. Energy state of the H2 molecule; and 4. The Condensation behavior in N
weakly interacting Boson gas.
In the single-photon heat engine, we have derived the equation of state similar
to that in classical ideal gas and applied it to construct the Carnot cycle with a single
photon, and showed the Carnot efficiency in this single-photon heat engine.
The energies of the ground state of multi-electron atoms are calculated using the
modi ed Bohr model with a shell structure of the bound electrons. The di erential
Schrodinger equation is simpli ed into the minimization problem of a simple energy
functional, similar to the problem in dimensional scaling in the H-atom. For the
C-atom, we got the ground state energy -37:82 eV with a relative error less than 6
%.
The simplest molecular ion, H+
2 , has been investigated by the quasi-classical
method and two-center molecular orbit. Using the two-center molecular orbit derived
from the exact treatment of the H+
2 molecular ion problem, we can reduce the number
of terms in wavefunction to get the binding energy of the H2 molecule, without using
the conventional wavefunction with over-thousand terms. We get the binding energy
for the H2 with Hylleraas correlation factor 1 + kr12 as 4:7eV, which is comparable
to the experimental value of 4:74 eV.
Condensation in the ground state of a weakly interacting Bose gas in equilibrium
is investigated using a partial partition function in canonical ensemble. The recursive
relation for the partition function developed for an ideal gas has been modi ed to
be applicable in the interacting case, and the statistics of the occupation number in
condensate states was examined. The well-known behavior of the Bose-Einstein Condensate
for a weakly interacting Bose Gas are shown: Depletion of the condensate
state, even at zero temperature, and a maximum
uctuation near transition temperature.
Furthermore, the use of the partition function in canonical ensemble leads to
the smooth cross-over between low temperatures and higher temperatures, which has
enlarged the applicable range of the Bogoliubov transformation. During the calculation,
we also developed the formula to calculate the correlations among the excited
states.
22
Timko, Jeff. « Bohmian Trajectories of the Two-Electron Helium Atom ». Thesis, 2007. http://hdl.handle.net/10012/3491.
Texte intégralRésumé :
We introduce the de Broglie-Bohm causal interpreation of quantum mechanics and compare it to the standard interpretation of quantum mechanics, the Copenhagen interpretation. We examine the possibility of experimentally distinguishing between the two theories, as well as the potential for the causal interpretation to more easily bridge the gap between the physics of the quantum and classical worlds. We then use the causal interpretation to construct a deterministic model of the helium atom in which the two electrons move along trajectories through space and time about a stationary nucleus. The dynamics are governed by the non-relativistic Schrödinger equation and the spin vectors of both electrons are assumed to be constant along their respective trajectories. We examine the Bohmian trajectories associated with (approximations to) eigenstates of the helium Hamiltonian as well as the trajectories associated with some non-eigenstates. We also compute an approximation to the ground state energy of the helium atom using a representation of the helium wavefunction in terms of hydrogenic eigenfunctions which is motivated by a perturbation approach.
23
Howard, Colin. « Measuring, interpreting, and translating electron quasiparticle-phonon interactions on the surfaces of the topological insulators bismuth selenide and bismuth telluride ». Thesis, 2015. https://hdl.handle.net/2144/15681.
Texte intégralRésumé :
The following dissertation presents a comprehensive study of the interaction between Dirac fermion quasiparticles (DFQs) and surface phonons on the surfaces of the topological insulators Bi2Se3 and Bi2Te3. Inelastic helium atom surface scattering (HASS) spectroscopy and time of flight (TOF) techniques were used to measure the surface phonon dispersion of these materials along the two high-symmetry directions of the surface Brillouin zone (SBZ). Two anomalies common to both materials are exhibited in the experimental data. First, there is an absence of Rayleigh acoustic waves on the surface of these materials, pointing to weak coupling between the surface charge density and the surface acoustic phonon modes and potential applications for soundproofing technologies. Secondly, both materials exhibit an out-of-plane polarized optical phonon mode beginning at the SBZ center and dispersing to lower energy with increasing wave vector along both high-symmetry directions of the SBZ. This trend terminates in a V-shaped minimum at a wave vector corresponding to 2kF for each material, after which the dispersion resumes its upward trend. This phenomenon constitutes a strong Kohn anomaly and can be attributed to the interaction between the surface phonons and DFQs.
To quantify the coupling between the optical phonons experiencing strong renormalization and the DFQs at the surface, a phenomenological model was constructed based within the random phase approximation. Fitting the theoretical model to the experimental data allowed for the extraction of the matrix elements of the coupling Hamiltonian and the modifications to the surface phonon propagator encoded in the phonon self energy. This allowed, for the first time, calculation of phonon mode-specific quasiparticle-phonon coupling λⱱ(q) from experimental data. Additionally, an averaged coupling parameter was determined for both materials yielding ¯λ^Te ≈ 2 and ¯λ^Se ≈ 0.7. These values are significantly higher than those of typical metals, underscoring the strong coupling between optical surface phonons and DFQs in topological insulators.
In an effort to connect experimental results obtained from phonon and photoemission spectroscopies, a computational process for taking coupling information from the phonon perspective and translating it to the DFQ perspective was derived. The procedure involves using information obtained from HASS measurements (namely the coupling matrix elements and optical phonon dispersion) as input to a Matsubara Green function formalism, from which one can obtain the real and imaginary parts of the DFQ self energy. With these at hand it is possible to calculate the DFQ spectral function and density of states, allowing for comparison with photoemission and scanning tunneling spectroscopies. The results set the necessary energy resolution and extraction methodology for calculating ¯λ from the DFQ perspective. Additionally, determining ¯λ from the calculated spectral functions yields results identical to those obtained from HASS, proving the self-consistency of the approach.