Tesi sul tema "Dimensioncal crossover"
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Lammers, Sören [Verfasser], e Christof [Akademischer Betreuer] Wetterich. "Dimensional crossover of nonrelativistic bosons / Sören Lammers ; Betreuer: Christof Wetterich". Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1178010848/34.
Testo completoSommer, Ariel T. (Ariel Tjodolv). "Strongly interacting Fermi gases : non-equilibrium dynamics and dimensional crossover". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83820.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 163-176).
Experiments using ultracold atomic gases address fundamental problems in many-body physics. This thesis describes experiments on strongly-interacting gases of fermionic atoms, with a focus on non-equilibrium physics and dimensionality. One of the fundamental dissipative processes in two-component gases is the transport of spin due to relative motion between the two spin components. We generate spin transport in strongly-interacting Fermi gases using a spin dipole excitation and measure the transport coefficients describing spin drag and spin diffusion. For resonant interactions, we observe strong suppression of spin transport, with the spin transport coefficients reaching quantum-mechanical limits. Dimensionality plays an important role in the formation of bound states between pairs of particles. We tune the dimensionality of a Fermi gas from three to two dimensions (2D) using an optical lattice potential and observe the evolution of the pair binding energy using radio-frequency spectroscopy. The binding energy increases as the lattice depth increases, approaching the 2D limit. Gases with resonant interactions, which have no two-body bound state in three dimensions, show a large binding energy determined by the confinement energy of the lattice wells. The themes of non-equilibrium dynamics and dimensionality come together in the study of soliton excitations in superfluid Fermi gases. We create a planar defect in the superfluid order parameter of an elongated Fermi gas using detuned laser light. This defect moves through the gas as a solitary wave, or soliton, without dispersing. We measure the oscillation period of the soliton and find it to exceed the predictions of mean-field theory by an order of magnitude.
by Ariel T. Sommer.
Ph.D.
Xu, Jie. "Magnetic Order and Dimensional Crossover in Optical Lattices with Repulsive Interaction". W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539623610.
Testo completoBöttcher, Igor [Verfasser], e Christof [Akademischer Betreuer] Wetterich. "Dimensional BCS-BEC crossover in ultracold Fermi gases / Igor Böttcher ; Betreuer: Christof Wetterich". Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180301226/34.
Testo completoGarst, Markus [Verfasser]. "Aspects of Quantum Phase Transitions: Grüneisen Parameter, Dimensional Crossover and Coupled Impurities / Markus Garst". Aachen : Shaker, 2004. http://d-nb.info/1170537421/34.
Testo completoBrillon, Charles. "Le crossover dimensionel dans la chaleur spécifique du modèle de Hubbard demi-rempli". Mémoire, Université de Sherbrooke, 2007. http://savoirs.usherbrooke.ca/handle/11143/4770.
Testo completoReimann, Thomas. "Resonant spin dynamics and 3D-1D dimensional crossovers in ultracold Fermi gases". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE029/document.
Testo completoThe exploration of strongly correlated quantum many-body systems represents one of the most challenging fields of research of contemporary physics. Over the past thirty years, dilute vapors of neutral atoms suspended in vacuum and controlled with laser light have become a versatile and powerful platform for the study of such systems. At the very heart lies the ability to arbitrarily tune the interaction strength by means of magnetically induced Feshbach resonances as well as the possibility to create a wide range of potential landscapes via precisely tailored optical fields. This thesis reports on the recent results of the FerMix experiment, which is dedicated to the study of fermionic quantum many-body-systems at ultralow temperatures using the Alkali atoms 40K and 6Li. The main results presented in this text are twofold. First, we report on the experimental characterization of a novel (s,d)-wave Feshbach resonance in 6Li, the results of which are compared to the corresponding theoretical predictions. In particular, the spectrum of the inelastic loss rate is determined for different temperatures and trap depths, which enables us to identify the losses as two-body processes. Moreover, the dominant entrance channel is confirmed to be s-wave in nature. Using rate equation models we analyze the observed heating of the atomic ensemble and find the behavior to be consistent with the predicted L = 2 bound state present in the exit channel. Finally, we investigate experimentally the dynamics of the spin populations driven by resonantly enhanced inelastic collisions in dwave, observing good agreement with our numerical models. Second, we summarize our progress towards the study of dimensional crossovers between the Tomonaga-Luttinger liquid in 1D and the Landau-Fermi liquid in 3D using Fermi gases of 40K confined in a large spacing optical lattice. This includes both the fundamental design considerations as well as the implementation of the required experimental hardware
Ries, Martin Gerhard [Verfasser], e Selim [Akademischer Betreuer] Jochim. "A Two-Dimensional Fermi Gas in the BEC-BCS Crossover / Martin Gerhard Ries ; Betreuer: Selim Jochim". Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180301994/34.
Testo completoVignarooban, Kandasamy. "Boson Mode, Dimensional Crossover, Medium Range Structure and Intermediate Phase in Lithium- and Sodium-Borate Glasses". University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353100044.
Testo completoTakeuchi, Tsunehiro, Takeshi Kondo, Takio Kitao, Hiroyuki Kaga, Hongbo Yang, Hong Ding, Adam Kaminski e Juan Carlos Campuzano. "Two- to Three-Dimensional Crossover in the Electronic Structure of (Bi,Pb)_2(Sr; La)_2 CuO_6+δ from Angle-Resolved Photoemission Spectroscopy". The American Physical Society, 2005. http://hdl.handle.net/2237/7155.
Testo completoArmijo, Julien. "Fluctuations de densité dans des gaz de bosons ultafroids quasi-unidimensionnels". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00601066.
Testo completoRuess, Frank Joachim Physics Faculty of Science UNSW. "Atomically controlled device fabrication using STM". Awarded by:University of New South Wales. Physics, 2006. http://handle.unsw.edu.au/1959.4/24855.
Testo completoBakrim, Hassan. "Étude des transitions de Peierls dans les systèmes unidimensionnels et quasi-unidimensionnels". Thèse, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/5140.
Testo completoYeh, Che-Kai, e 葉哲愷. "Dimensional Analysis and Prediction of Dielectrophoretic Crossover Frequency of Spherical Particles". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/dzja64.
Testo completo國立臺灣大學
機械工程學研究所
105
In recent years, the biochip technology is flourishing as the demand for medical laboratory has been increasing. However, the phenomenon of dielectrophoresis (DEP) plays an indispensable role in the biochip for many biological and colloidal science application. We can easily manipulate the motion of micro particle with non-contact by changing the alternating current (AC) electric field frequency, the kinds of medium and electrode shape, to separate different properties and size of particle. Then we can reach a variety of biomedical purposes. In dielectrophoresis research, the general calculation of the crossover frequency method include the dipole model and numerical simulations based on Maxwell stress tensor (MST). The dipole model is high computation efficiency but cannot predict the crossover frequency for larger particles or large medium conductivity accurately and the situation of no crossover frequency. The MST method is accuracy but time-consuming and may lack predictive understanding of the interplay between key parameters. Here, we present a mathematical model using Buckingham pi theorem and predict the crossover frequency of different parameter sets and the situation of no crossover frequency. The first research process is dimensional analysis using Buckingham pi theorem. Secondly, we establish a database of electrophoretic parameters using MST simulation and insert them to dimensional parameter set. Third, we can find the relationship between the crossover frequency and five import parameters (medium conductivity, medium permittivity, particle permittivity, particle size and particle surface conductivity) and built mathematical model to predict the crossover frequency of different situations and the situation of no crossover frequency. Finally we compare the results with previous experiment, dipole model and MST. In addition, we explore the reasons for dipole model error and provide physical insights through our mathematic model our research establish.
Ghosh, Sudeep Kumar. "Ultra Cold Fermions : Dimensional Crossovers, Synthetic Gauge Fields and Synthetic Dimensions". Thesis, 2016. http://hdl.handle.net/2005/3062.
Testo completo"The Packing Landscapes of Quasi-One Dimensional Hard Sphere Systems". Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-09-1640.
Testo completoChih-Yu, Chen. "Two-dimensional BCS-BEC Crossover at Finite Temperature -A Study on the D-wave Pair Susceptibility". 2003. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2807200614520500.
Testo completoChen, Chih-Yu, e 陳志宇. "Two-dimensional BCS-BEC Crossover at Finite Temperature-A Study on the D-wave Pair Susceptibility". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/53338324927849636895.
Testo completo國立臺灣大學
物理研究所
94
In this article we studied the BCS-BEC crossover in two-dimensional d-wave pairing at finite temperature. We would life to calculat the relation between condensate numbers and chemical potential and then find the energy gap in superconductors. We will discuss the attractive seperable potential and the contact (hard core) potential with d-wave form. The main diffrence between d-wave and s-wave is that the d-wave is angle dependent. It will lead to a factor of 1/2 in the perturbation expansion of the hard core potential. We analyzed the asymptotic property of the two potentials. It is showed that the pair susceptibility will diverge for some kinds of potential. That is, some of potentials is computable in mean field theory but not in the pair susceptibility method.
"Analytical Methods for High Dimensional Physiological Sensors". Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.44015.
Testo completoDissertation/Thesis
Doctoral Dissertation Industrial Engineering 2017
Lenz, Benjamin. "Unconventional Phases in Two-Dimensional Hubbard and Kondo-Lattice Models by Variational Cluster Approaches". Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0023-3DFC-1.
Testo completo"Dimensional crossover in the properties of nonlinear composites by real-space renormalization group theory =: 用重正化理論硏究非線性複合物的維度交疊物性". Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888839.
Testo completoThesis (Ph.D.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references.
by Siu Wing Hon.
Acknowledgement --- p.i
Abstract --- p.ii
Publication List --- p.iv
Chapter 1 --- Introduction --- p.1
References --- p.6
Chapter 2 --- Real-Space Renormalization Group (RG) Theory in Electrical Conduction --- p.9
Chapter 2.1 --- Scale Invariance --- p.10
Chapter 2.2 --- Critical Exponents --- p.14
Chapter 2.3 --- Alternative View-Point of RG Theory --- p.15
References --- p.18
Chapter 3 --- "Weakly Nonlinear Composites: Critical Behavior, Flicker Noise and Crossover Behavior" --- p.19
Chapter 3.1 --- Introduction --- p.19
Chapter 3.2 --- Formalism --- p.20
Chapter 3.3 --- Critical Exponents by RG Method --- p.22
Chapter 3.4 --- Connection to Flicker Noise Problem and Crossover Behavior --- p.25
Chapter 3.5 --- Discussions and Conclusions --- p.27
References --- p.28
Chapter 4 --- Critical Behavior of Strongly Nonlinear Composites --- p.30
Chapter 4.1 --- Introduction --- p.30
Chapter 4.2 --- Formalism --- p.31
Chapter 4.3 --- Applications of RG Theory to Strongly Nonlinear Composites --- p.32
Chapter 4.4 --- Connections with Links-Nodes-Blobs picture --- p.36
Chapter 4.5 --- Discussions and Conclusions --- p.39
References --- p.41
Chapter 5 --- "Enhanced Nonlinear Response of Superconductor-Normal-conductor Composite Wires, Strips and Rods" --- p.43
Chapter 5.1 --- Introduction --- p.43
Chapter 5.2 --- Formalism --- p.45
Chapter 5.3 --- Linear and Nonlinear Responses of Composite Wires --- p.46
Chapter 5.4 --- Linear and Nonlinear Response of Composite Strips --- p.49
Chapter 5.5 --- Linear and Nonlinear Responses of Composite Rods --- p.56
Chapter 5.6 --- Scaling Behaviors --- p.59
Chapter 5.7 --- Discussions and Conclusions --- p.63
References --- p.64
Chapter 6 --- Renormalized Effective Medium Theory for Weakly Nonlinear Composites --- p.66
Chapter 6.1 --- Introduction --- p.66
Chapter 6.2 --- Weakly Nonlinear Conductance Network --- p.69
Chapter 6.3 --- Simulation --- p.70
Chapter 6.4 --- Effective Medium Approximation --- p.76
Chapter 6.5 --- Renormalized Effective Medium Approximation --- p.79
Chapter 6.6 --- Discussion and Conclusions --- p.81
References --- p.83
Chapter 7 --- Conclusions --- p.86
Chapter A --- Derivation of Voltage-Summation Formulas --- p.88
Chapter B --- Effective Linear and Nonlinear Response of 2 x 2 cell --- p.92
Chapter C --- Duality Symmetry in 2D Network --- p.97
Chapter D --- Derivation of Effective-Medium Approximation --- p.99