Готові списки джерел за темами / Probing Exciton Dynamics

Добірка наукової літератури з теми "Probing Exciton Dynamics"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Probing Exciton Dynamics"

Pan, Jie. "Computationally probing exciton dynamics." Nature Computational Science 1, no. 4 (April 2021): 246. http://dx.doi.org/10.1038/s43588-021-00065-4.

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Zhao, Siqi, Dawei He, Jiaqi He, Xinwu Zhang, Lixin Yi, Yongsheng Wang, and Hui Zhao. "Probing excitons in transition metal dichalcogenides by Drude-like exciton intraband absorption." Nanoscale 10, no. 20 (2018): 9538–46. http://dx.doi.org/10.1039/c8nr03135e.

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Tikhomirov, S. A. "Ultrafast dynamics and mechanisms of non-stationary absorption in thin gallium selenide samples." Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series 57, no. 1 (April 2, 2021): 99–107. http://dx.doi.org/10.29235/1561-2430-2021-57-1-99-107.

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Herein, the dynamics and mechanisms of induced absorption in thin samples of gallium selenide under various excitation conditions are studied using femtosecond kinetic spectroscopy. We have registered several types of induced changes including induced absorption on free charge carriers (“hot” and thermalized electrons), bleaching and absorption due to the population of near-edge trap or exciton states, as well as rapid changes in the absorption of probing radiation in the region of the overlap of the exciting and probing pulses due to two-quantum two-frequency interband transitions. The time ranges of the relaxation processes are estimated. It is shown that when using relatively low-intensity long-wave excitation (790 nm), the resonant excitation of the near-edge states occurs mainly due to two-quantum two-frequency transitions followed by the formation of the dynamic equilibrium between bound and free electrons in the time range up to 5 ps. When electrons are excited deeply into the conduction band with the formation of hot free electrons and their subsequent thermalization to the bottom of the conduction band in the time range up to 1 ps, the population of the near-edge states and the establishment of the dynamic equilibrium between bound and free electrons is realized in the same time range (5 ps) as when they are excited “from below”.

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Somoza Márquez, Alejandro, Lipeng Chen, Kewei Sun, and Yang Zhao. "Probing ultrafast excitation energy transfer of the chlorosome with exciton–phonon variational dynamics." Physical Chemistry Chemical Physics 18, no. 30 (2016): 20298–311. http://dx.doi.org/10.1039/c5cp06491k.

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Bock, A. M., D. Schmid, and C. Kryschi. "Femtosecond probing of singlet exciton dynamics in polybithiophene films." Radiation Effects and Defects in Solids 155, no. 1-4 (November 2001): 299–303. http://dx.doi.org/10.1080/10420150108214128.

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Gdor, I., H. Sachs, A. Roitblat, D. Strasfeld, M. G. Bawendi, and S. Ruhman. "Hyperspectral Probing of Exciton dynamics and Multiplication in PbSe Nanocrystals." EPJ Web of Conferences 41 (2013): 04037. http://dx.doi.org/10.1051/epjconf/20134104037.

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Yan, Tengfei, Hongyi Yu, Ke Xiao, Wang Yao, and Xiaodong Cui. "Probing the exciton k-space dynamics in monolayer tungsten diselenides." 2D Materials 6, no. 2 (March 15, 2019): 025035. http://dx.doi.org/10.1088/2053-1583/ab0a4e.

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Bock, Alexander M., Dankward Schmid, and Carola Kryschi. "Femtosecond probing of exciton relaxation and transport dynamics in polybithiophene." Journal of Chemical Physics 111, no. 3 (July 15, 1999): 1185–90. http://dx.doi.org/10.1063/1.479303.

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Korotkevich, Alexander A., and Huib J. Bakker. "Ultrafast vibrational dynamics of aqueous acetate and terephthalate." Journal of Chemical Physics 156, no. 9 (March 7, 2022): 094501. http://dx.doi.org/10.1063/5.0082462.

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We study the vibrational population relaxation and mutual interaction of the symmetric stretch ( ν s) and antisymmetric stretch ( ν as) vibrations of the carboxylate anion groups of acetate and terephthalate ions in aqueous solution by femtosecond two-dimensional infrared spectroscopy. By selectively exciting and probing the ν s and ν as vibrations, we find that the interaction of the two vibrations involves both the anharmonic coupling of the vibrations and energy exchange between the excited states of the vibrations. We find that both the vibrational population relaxation and the energy exchange are faster for terephthalate than for acetate.

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Leone, Stephen R., and Daniel M. Neumark. "Probing matter with nonlinear spectroscopy." Science 379, no. 6632 (February 10, 2023): 536–37. http://dx.doi.org/10.1126/science.add4509.

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Дисертації з теми "Probing Exciton Dynamics"

Lott, Geoffrey Adam 1980. "Probing local conformation and dynamics of molecular complexes using phase-selective fluorescence correlation and coherence spectroscopy." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10914.

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xv, 177 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.
When two or more fluorescent chromophores are closely spaced in a macromolecular complex, dipolar coupling leads to delocalization of the excited states, forming excitons. The relative transition frequencies and magnitudes are sensitive to conformation, which can then be studied with optical spectroscopy. Non-invasive fluorescence spectroscopy techniques are useful tools for the study of dilute concentrations of such naturally fluorescent or fluorescently labeled biological systems. This dissertation presents two phase-selective fluorescence spectroscopy techniques for the study of dynamical processes in bio-molecular systems across a wide range of timescales. Polarization-modulated Fourier imaging correlation spectroscopy (PM-FICS) is a novel phase-selective fluorescence spectroscopy for simultaneous study of translational and conformational dynamics. We utilize modulated polarization and intensity gratings with phase-sensitive signal collection to monitor the collective fluctuations of an ensemble of fluorescent molecules. The translational and conformational dynamics can be separated and analyzed separately to generate 2D spectral densities and joint probability distributions. We present results of PM-FICS experiments on DsRed, a fluorescent protein complex. Detailed information on thermally driven dipole-coupled optical switching pathways is found, for which we propose a conformation transition mechanism. 2D phase-modulation electronic coherence spectroscopy is a third-order nonlinear spectroscopy that uses collinear pulse geometry and acousto-optic phase modulation to isolate rephasing and nonrephasing contributions to the collected fluorescence signal. We generate 2D spectra, from which we are able to determine relative dipole orientations, and therefore structural conformation, in addition to detailed coupling information. We present results of experiments on magnesium tetraphenylporphyrin dimers in lipid vesicle bilayers. The 2D spectra show clearly resolved diagonal and off-diagonal features, evidence of exciton behavior. The amplitudes of the distinct spectral features change on a femtosecond timescale, revealing information on time-dependent energy transfer dynamics. This dissertation includes co-authored and previously published material.
Committee in charge: Hailin Wang, Chairperson, Physics; Andrew Marcus, Advisor, Chemistry; Stephen Gregory, Member, Physics; Michael Raymer, Member, Physics; Marina Guenza, Outside Member, Chemistry

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Mohapatra, Aiswarya Abhisek. "Mechanistic Understanding of Organic Solar Cells: A Detailed Investigation on Role of Förster Resonance Energy Transfer, Dielectric Constant and Exciton Dynamics." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4679.

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Organic solar cells (OSC) have been emerging as promising energy harvesting technology because of their low-cost fabrication, semitransparency, solution processability and ability to be produced in large scale using roll-to-roll processing methods. It was envisaged that, resonance energy transfer (RET) is pivotal for improving device efficiencies of ternary blend solar cells (TBSCs). Taking analogy from natural photosynthetic systems, we have shown that mechanistic deviations of observed RET rates from an expected Förster type mechanism are anticipated in OSCs. But unlikely the highly efficient photosynthetic systems, blend morphology plays an important role in dictating the device performance of OSCs. We extracted new suggested strategies to systematically correlate the R0 with increments in current density (ΔJSC) and to optimize the effect of FRET in enhancing the photocurrent for realizing high efficiency OSCs. Chapter 2 and 3 discuss incorporation of a small molecule and polymer in fullerene and NFA based TBSCs, respectively. FRET between the donor components played an important role in enhancement of PCE and this was established by probing the excited state photophysics using both steady state and transient absorption (TA) spectroscopy. The fullerene based TBSCs had >300 nm thick active layer which implicates its potential application in roll-to-roll processable OSCs. In the NFA based TBSCs, we observed ≥ 10% increment in JSC, which enhanced PCE up to 10.34% for PTB7-Th:PBDB-T:IT4F blend. An important conclusion drawn from this work is although FRET plays an important role in enhancing device photocurrent, its extent is limited by blend morphology, synchronous with our finding in the first chapter. The ultrafast charge generation mechanism of a reported high-performing NFA based OSC, PM6:Y6 is discussed in Chapter 4. The PCE of ~15 % is achieved with external quantum efficiency > 70 % in the 400-900 nm region. TA spectroscopy was employed to understand the charge generation by probing both electron and hole transfer processes at ultrafast timescales. It was concluded that the slow hole transfer rate is limited by singlet exciton diffusion in Y6 molecule and is key to the observed dynamics of charge generation. These results also suggest that ultrafast charge transfer is not a necessary condition for efficient generation of free charges. In Chapter 5, we reported synthesis of three new conjugated copolymers with high dielectric constant (εr). To improve the εr of semiconducting polymers, we followed a two-pronged approach: (i) introduction of TEG sidechains in D-A type semiconducting polymers to enhance the dipolar polarization and (ii) variation in electron-donating strength of donor chromophores in the polymer backbone. This led to the achievement of εr ~ 4-5 at room temperature in MHz frequency range. However, free charge generation could not be achieved for any of the polymers, which is possibly because the low electronic polarization of TEG groups rendering the screening of hole and electrons ineffective. We conclude that concerted efforts should be made to not only improve the εr in MHz frequency regime but also in high frequency regime so as to achieve free charge carrier generation.

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Частини книг з теми "Probing Exciton Dynamics"

Ma, Y. Z., M. W. Graham, L. Valkunas, S. M. Bachilo, and G. R. Fleming. "Probing Exciton Dynamics of Semiconducting Single-Walled Carbon Nanotubes Using Photon Echo Spectroscopy." In Ultrafast Phenomena XV, 686–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_220.

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Dey, Shantanu, Ujjwal Mandal, Aniruddha Adhikari, Subhadip Ghosh, and Kankan Bhattacharyya. "Probing Dynamic Heterogeneity in Nanoconfined Systems: The Femtosecond Excitation Wavelength Dependence and Fluorescence Correlation Spectroscopy." In Hydrogen Bonding and Transfer in the Excited State, 159–74. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470669143.ch7.

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Sension, Roseanne J., Zhaohui Wang, Ofir Shoshana, Bixue Hou, and Sanford Ruhman. "Reexamining CTTS dynamics of Na− — Probing the excited state and electron using multipulse pump-probe." In Ultrafast Phenomena XIII, 462–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_144.

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Shi, Ying, and Hang Yin. "Probing Dynamics of Nonfluorescent Excited-State Intramolecular Proton Transfer." In Hydrogen-Bonding Research in Photochemistry, Photobiology, and Optoelectronic Materials, 119–36. WORLD SCIENTIFIC (EUROPE), 2019. http://dx.doi.org/10.1142/9781786346087_0005.

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Тези доповідей конференцій з теми "Probing Exciton Dynamics"

Grevatt, T., N. J. Traynor, R. E. Worsley, and R. T. Harley. "Magnetic field dependence of exciton spin dynamics in GaAs quantum wells." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.tuc.5.

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We discuss the significance of spin-relaxation for exciton dephasing in quantum well systems at low temperatures and also study the magnetic field dependence of spin-relaxation. We have used a novel technique employing reflective probing of pump-induced transient linear birefringence to investigate ultrafast dephasing of n=1 heavy-hole excitons as a function of magnetic field in GaAs/AlGaAs samples. We have also measured the spin-relaxation time and exciton lifetime of the samples. Exciton spin-relaxation in such samples is dominated, in zero field, by simultaneous electron and hole spin flips driven by confinement-enhanced exchange interaction [1]. We find that for localised excitons in narrow wells pure dephasing processes are negligible and spin-relaxation is dominant in zero magnetic field. In applied field the exciton spin-relaxation is strongly suppressed and the dephasing becomes lifetime-limited.

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Maslov, A., and D. S. Citrin. "Probing radial electron-hole wavepacket dynamics in quantum wells with terahertz pulses." In Quantum Optoelectronics. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/qo.1997.qwb.6.

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The routine availability of sub-ps laser pulses has led to the preparation and probing of electronic wavepackets in Rydberg atoms. [1] An atom – initially in the ground state – is excited optically by a short pulse to a superposition of states centered at a large principle quantum number n. Both radially [2] and angularly localized [3] electronic wavepackets have been created. The wavepacket at various time delays may then be probed by field ionization using a pulsed electric field. [2-4] In semiconductor quantum wells (QW) optically excited electron-hole (e-h) wavepackets have also been observed; [5,6] however, such wavepackets differ markedly from their Rydberg-atom counterparts. In the QW, an optical pulse centered near the QW bandedge E0 and with a bandwidth that exceeds the 1s-exciton binding energy coherently excites from the crystal ground state excitons with principle quantum numbers ranging from n = 1 through the continuum. Moreover, the dipole selection rule for the excitation of e-h pairs from the crystal ground state dictates that only s states are created since these are the only states with nonzero e-h overlap. In Ref. [5], two-pulse four-wave mixing (FWM) experiments were performed on compressively strained Ino.o8Gao.92As/GaAs multiple QW’s excited by 110-fs optical pulses. Compressive strain in such structures substantially increases the light-hole-heavy-hole splitting, thus allowing the excitation of e-h pairs involving only the heavy-hole. The time-integrated (TI-) FWM signal as a function of time delay between the two pulses shows distinct beating when the laser center frequency is near resonance with E0.

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Policht, Veronica R., Oleg Dogadov, Andrea Villa, Qiuyang Li, Aaron M. Ross, Francesco Scotognella, Xiaoyang Zhu, Stefano Dal Conte, and Giulio Cerullo. "Direct Observation of the Interlayer Exciton Formation Dynamics in Transition Metal Dichalcogenide Heterostructures." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.m2b.4.

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MoSe2/WSe2 transition metal dichalcogenide heterostructures host spatially-indirect interlayer excitons (ILX) following interlayer charge transfer (ICT). We perform ultrafast transient absorption spectroscopy directly probing the ILX formation time and find it to be significantly longer than ICT.

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Ma, Y. Z., M. W. Graham, G. R. Fleming, L. Valkunas, and S. M. Bachilo. "Probing Exciton Dynamics of Semiconducting Single-Walled Carbon Nanotubes Using Photon Echo Spectroscopy." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/up.2006.mh17.

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Deckert, Thomas, Jonas Allerbeck, Laurens Spitzner, and Daniele Brida. "Probing Free Carrier and Exciton Dynamics in Bulk Gallium Selenide with Two-Dimensional Electronic Spectroscopy." In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fm4n.7.

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Ultrafast two-dimensional electronic spectroscopy with phase-locked pump pulses provides a unique method to disentangle exciton and free carrier dynamics in the prototypical semiconductor gallium selenide with sub-10 fs temporal and 4 meV spectral resolution.

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Allerbeck, Jonas, Thomas Deckert, Laurens Spitzner, and Daniele Brida. "Probing Free Carrier and Exciton Dynamics in a Bulk Semiconductor with Two-Dimensional Electronic Spectroscopy." In 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2021. http://dx.doi.org/10.1109/cleo/europe-eqec52157.2021.9541942.

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Lu, X. Z., R. Rao, A. Doukas, B. Willman, S. Lee, and R. R. Alfano. "Photoluminescence dynamics of the layered GaSe semiconductor under Intense picosecond laser-induced shock waves." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.thf4.

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The generation of intense picosecond laser- driven shock waves in the layered GaSe semiconductor and simultaneous probing of the sample using another picosecond laser to study the shock- induced phenomena are discussed. In unshock condition, at low probe intensity, spontaneous emission is observed while at high probe intensity stimulated emission is observed. Under laser- induced shock pressure, 20-nm spectral shift of spontaneous emission and sixfold decrease in the intensity of stimulated emission have been detected. By careful band-shape analysis, both spontaneous and stimulated emission is attributed to the exciton-exciton scattering process. The red shift of the spontaneous emission is caused by the shrinkage of GaSe band gap under shock pressure. The quenching of the stimulated emission is explained on the basis of stimulated absorption by the electron-hole recombination process.

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Sharma, Chhavi, and Mahesh Kumar. "Probing ultrafast dynamics of photo-excited Bismuth nanostructure." In 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC). IEEE, 2019. http://dx.doi.org/10.23919/ursiap-rasc.2019.8738275.

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Dani, Keshav M. "Probing the momentum-resolved dynamics of excitons in 2D semiconductors." In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.cmp14a_01.

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Cardoza, David, Andrei Florean, James White, Roseanne Sension, and Philip Bucksbaum. "Probing excited state dynamics of retinal isomerization in bacteriorhodopsin." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4552194.

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