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Friday, July 17, 2020 | History

2 edition of Finite temperature excitations in a dilute Bose-condensed gas. found in the catalog.

Finite temperature excitations in a dilute Bose-condensed gas.

Hua Shi

Finite temperature excitations in a dilute Bose-condensed gas.

by Hua Shi

  • 123 Want to read
  • 18 Currently reading

Published .
Written in English

    Subjects:
  • Physics Theses

  • Edition Notes

    SeriesCanadian theses = Thèses canadiennes
    ContributionsGriffin, A. (supervisor)
    The Physical Object
    Pagination123 leaves.
    Number of Pages123
    ID Numbers
    Open LibraryOL19609650M
    ISBN 100612280586

    research on the properties of Bose-condensed dilute gases. The first treatment of BEC at finite temperatures, this book presents and the author of Excitations in a Bose-condensed Liquid (, , Green’s functions in a Bose-condensed gas 68 Classification of self-energy approximations Landau damping in weakly interacting Bose gases is investigated by means of perturbation theory. Our approach points out the crucial role played by Bose-Einstein condensation and yields an explicit expression for the decay rate of elementary excitations in both uniform and non uniform gases. Systematic results are derived for the phonon width in homogeneous gases interacting with repulsive.

    Get this from a library! Bose-condensed gases at finite temperatures. [Allan Griffin; Tetsuro Nikuni; Eugene Zaremba] -- The discovery of Bose-Einstein condensation in trapped ultracold atomic gases in has led to an explosion of theoretical & experimental research on the properties of Bose-condensed dilute gases.   The thermal conductivity of a trapped dipolar Bose condensed gas is calculated as a function of temperature in the framework of linear response theory. The contributions of the interactions between condensed and noncondensed atoms and between noncondensed atoms in the presence of both contact and dipole-dipole interactions are taken into account to the thermal relaxation time, by .

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We present results from a detailed Quantum Monte Carlo study of BEC applied to JILA experiment[Jin et al, Phys. Rev. Lett,,]. This is the first Monte Carlo approach (based on Feynman-Kac path integral method) to the above problem where good agreement is found for both the lowest lying m = 2 and m = 0 mode. HFB excitation spectrum of an inhomogeneous Bose gas at T 6= 0, of the kind recently discussed by Edwards et al. [10] and Fetter [11] using the Bogoliubov approximation at T = 0 [7]. However, as we emphasize in the final section, the question of what are the “correct” excitations in a dilute weakly-interacting Bose gas is not simple one.


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Finite temperature excitations in a dilute Bose-condensed gas by Hua Shi Download PDF EPUB FB2

We present a systematic account of several approximations for the Beliaev self-energies for a uniform dilute Bose gas at finite temperature.

We discuss the first-order Popov approximation, which gives a phonon velocity which vanishes as n 0 (T), where n 0 (T) is the Bose condensate generalize this Popov approximation using a t-matrix calculated with self-consistent ladder Cited by: We present a systematic account of several approximations for the Beliaev self-energies for a uniform dilute Bose gas at finite temperature.

We discuss the first-order Popov approximation, which gives a phonon velocity which vanishes as n 0 (T), where n 0 (T) is the Bose condensate density. We generalize this Popov approximation using a t-matrix calculated with self-consistent ladder by:   Bose-Condensed Gases at Finite Temperatures 1st Edition by ultracold atomic gases in has led to an explosion of theoretical and experimental research on the properties of Bose-condensed dilute gases.

The first treatment of BEC at finite temperatures, this book presents a thorough account of the theory of two-component dynamics and Cited by: Collective excitations of a dilute Bose gas at finite temperature: TDHFB Theory Article (PDF Available) in Journal of Physics A Mathematical and Theoretical 50(42) September with 92 Reads.

FINITE-TEMPERATURE EXCITATIONS IN A DILUTE BOSE-CONDENSED GAS by Hua Shi Doctor of Philosophy. L Graduate Depart ment of P hysics University of Toronto ABSTRACT In this present several approximations applicable to a uniform tvcak1~- interacting Bose gas at fini te temperature.

and investigate the excitations ancl ot her. At T = 0, this analysis was initiated by Bogoliubov in for a weakly interacting dilute Bose gas (WIDBG) and the resulting picture is discussed in all advanced textbooks on statistical mechanics.

Much less well known are the dynamical properties of a WIDBG at intermediate temperatures (where the condensate fraction may be strongly depleted). Read the latest articles of Physics Reports atElsevier’s leading platform of peer-reviewed scholarly literature.

Books; Bose-Condensed Gases at Finite Temperatures; ultracold atomic gases in has led to an explosion of theoretical and experimental research on the properties of Bose-condensed dilute gases.

The first treatment of BEC at finite temperatures, this book presents a thorough account of the theory of two-component dynamics and. 15 Two-fluid hydrodynamics in a dilute Bose gas Equations of motion for local equilibrium Equivalence to the Landau two-fluid equations First and second sound in a Bose-condensed gas Hydrodynamic modes in a trapped normal Bose gas 16 Variational formulation of the Landau two-fluid equations   Physica C () North-Holland, Amsterdam EXCITATIONS OF A DENSE CHARGED BOSE GAS AT FINITE TEMPERATURES A.

GRIFFIN Department of Physics, Kyoto University, KyotoJapan Received 7 June We discuss the finite temperature excitation spectrum in a dense charged Bose-condensed gas (CBG), which is of interest in connection with the new high transition temperature.

Finite Temperature Excitations of a Trapped Bose Gas Article (PDF Available) in Physical Review Letters 78(10) November with 24 Reads How we measure 'reads'.

Using a field-theoretic formalism in terms of regular (proper, irreducible) quantities, we give a detailed analysis of the long-wavelength collisionless excitations of a weakly interacting dilute Bose-condensed gas in the intermediate-temperature region.

Earlier work by Szépfalusy and Kondor has shown that use of the free-Bose-gas approximation for the regular quantities leads to a phonon. Dynamics at finite temperatures using the moment method; Numerical simulation of the ZNG equations; Numerical simulation of collective modes at finite temperature; Landau damping in trapped Bose-condensed gases; Landau's theory of superfluidity; Two-fluid hydrodynamics in a dilute Bose gas; We discuss the finite temperature excitation spectrum in a dense charged Bose-condensed gas (CBG), which is of interest in connection with the new high transition temperature oxide superconductors.

The free Bose gas (RPA), and the 1-loop approximations for the proper, irreducible quantities are examined. We point out that while the plasmon excitation frequency is essentially temperature. Bose-Condensed Gases at Finite Temperatures Allan Griffin, Tetsuro Nikuni, Eugene Zaremba The discovery of Bose Einstein condensation (BEC) in trapped ultracold atomic gases in has led to an explosion of theoretical and experimental research on the properties of Bose-condensed dilute gases.

The above "high" T regime has been recently employed in Ref. [7] to provide a quantitative estimate of the width of the collective excitations of a dilute Bose gas trapped by a harmonic potent of the excitation as hw f c where cv is the frequency of the excitation and c = (h/m) [4Trano(r = 0) ] 1/2 is the value of the sound velocity calculated.

We present a systematic study of dilute three-dimensional dipolar Bose gas employing a finite temperature perturbation theory (beyond the mean field). We analyze in particular the behavior of the anomalous density, we find that this quantity has a finite value in the limit of weak interactions at both zero and finite temperatures.

We show that the presence of the dipole-dipole interaction. It is known that in a dilute gas of bosons cooled below a critical temperature a Bose-Einstein condensation occurs, i.e. a large fraction of bosons occupy the lowest quantum state, and.

A Bose–Einstein condensate (BEC) is a state of matter (also called the fifth state of matter) which is typically formed when a gas of bosons at low densities is cooled to temperatures very close to absolute zero ( °C). Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point microscopic quantum phenomena, particularly wavefunction interference.

Finite Temperature Excitations of a Trapped Bose Gas by Feynman-Kac Path Integral Approach S Datta Department of Theoretical Physics, 2A and 2B Raja S.

Mullick Road, Indian Association For the Cultivation of Science, Jadavpur, Kolkata Abstract- We. We present a systematic study of dilute three-dimensional dipolar Bose gas employing a finite temperature perturbation theory (beyond the mean field). We analyze in particular the behavior of the anomalous density, we find that this quantity has a finite value in the limit of weak interactions at both zero and finite temperatures.In this work, we employ the quasiparticle formalism at the Bogoliubov level to describe a weakly-interacting dilute Bose gas with SOC at zero temperature [46] [47] [48][49][50].

Following the. Title: Finite temperature excitations of a trapped Bose gas. Authors: D. A. W. Hutchinson, E. Zaremba, A. Griffin (Submitted on 4 Nov ) Abstract: We present a detailed study of the temperature dependence of the condensate and noncondensate density profiles of a Bose-condensed gas in a parabolic trap.

These quantitites are calculated self.