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Thursday, July 23, 2020 | History

2 edition of Collective modes in uncharged superfluid fermi systems. found in the catalog.

Collective modes in uncharged superfluid fermi systems.

M. T. Arthur

Collective modes in uncharged superfluid fermi systems.

by M. T. Arthur

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  • 35 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Birmingham, Dept of Mathematical Physics, 1981.

ID Numbers
Open LibraryOL13802281M

  The field of ultra-cold Fermi gases offers a great tool to study many different problems of correlated quantum systems. For example, in recent experiments [] polarized Fermi gases were systems make it possible to study physics in the presence of mismatched Fermi surfaces, and non-BCS (Bardeen, Cooper and Schrieffer) type pairing such . Vortices and Solitons in Fermi Superfluids or rather: Our search for an easy, yet versatile way to describe them UltracoldQuantum Gases ‐Current Trends and Future Perspectives th WE‐Heraus Seminar Bad Honnef, May 9th –13th Financial support by the Fund for Scientific Research‐Flanders Theory of Quantum and.

Now a concerted research effort is focused on creating and studying a BCS (Bardin-Cooper-Schrieffer) superfluid of Cooper pairs in an atomic Fermi gas. An outstanding issue is the apparent lack of a smoking gun for superfluidity in a Fermi gas, since the bulk properties are essentially unaffected by the : N Nygaard, G M. Bruun, B I. Schneider, D L. Feder, Charles W. Clark. Collective excitations in ultracold Fermi gases Julkaisija Perustieteiden korkeakoulu Yksikkö Department of Applied Physics Sarja Aalto University publication series DOCTORAL DISSERTATIONS 45/ Tutkimusala Ultracold Fermi gases Käsikirjoituksen pvm Väitöspäivä

occurs when some Fermi atoms have not paired up to form molecules. As mentioned earlier, the other extreme is the BCS superfluid phase, where Cooper pairs play the role of the molecules. This leads us to the crossover between the BCS and BEC phases of superfluid Fermi gases. The rest of these lectures will discuss this crossover in more Size: 3MB. Revealing the Superfluid Lambda Transition in the Universal Thermodynamics of a Unitary Fermi Gas Mark J. H. Ku, Ariel T. Sommer, Lawrence W. Cheuk, Martin W. Zwierlein* Fermi gases, collections of fermions such as neutro ns and electrons, are found throughout nature, from solids to neutron stars.


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Collective modes in uncharged superfluid fermi systems by M. T. Arthur Download PDF EPUB FB2

The low-energy modes of a superfluid atomic Fermi gas at zero temperature are investigated. The Bose-Einstein-condensate (BEC) side of the superfluid phase is studied in detail. The atoms are assumed to be in only one internal state, so that for a sufficiently diluted gas the pairing of fermions can be considered effective in the l = 1 channel by: 1.

We derive the long wavelength effective action for the collective modes in systems of fermions interacting via a short-range s-wave attraction, featuring unequal chemical potentials for the two fermionic species (asymmetric systems).As a consequence of the attractive interaction, fermions form a condensate that spontaneously breaks the U(1) symmetry associated with total number Cited by: 3.

All eigenvalues and eigenfunctions of the collective modes in Q1D are given explicitly. In Section 3 we study the collective modes in a Q2D and provide their eigenvalues and eigenfunctions.

In addition, the sound speeds in the Q1D and Q2D superfluid Fermi gases are calculated and their physical properties are also by: 5. Higgs and Goldstone modes are possible collective modes of an order parameter on spontaneously breaking a continuous symmetry.

Whereas the low-energy Goldstone (phase) mode is always stable Cited by: Abstract: A functional integral technique and a Legendre transform are used to give a systematic derivation of the Schwinger-Dyson equations for the generalized single-particle Green's function and the Bethe-Salpeter equation for the two-particle Green's function and the associated collective modes of a population-imbalanced spin-orbit-coupled atomic Fermi gas loaded in a.

Abstract: We characterize the collective modes of a soliton train in a quasi-one-dimensional Fermi superfluid, using a mean-field formalism. In addition to the expected Goldstone and Higgs modes, we find novel long-lived gapped modes associated with oscillations of the soliton by: 3.

This article presents an overview of recent theoretical progress made in Shanghai on collective excitations in superfluid Fermi gases in the BCS-BEC crossover.

All linear eigenvalues and eigenfunctions for systems of three-dimensional (3D) trapping potentials with spherical and axial symmetries are provided analytically and compared with Author: G.-X.

Huang. 8 CHAPTER 5. LANDAU THEORY OF THE FERMI LIQUID We now introduce the Fermi temperature TF = p2 F 2m∗k B ≡ εF kB () as the Fermi energy in temperature units, in terms of which the specific heat becomes CV = π2 2 nkB T TF = π2 3 T TF C0 V () where C0 V = 3 2 nkB is the specific heat of a classical ideal gas, and n is the particle File Size: KB.

lead to oscillations or collective modes. Pictorially, we can think of the modes as “oscillations of the Fermi sea”, although since the Fermi sea is a momentum space construction, and perturbations lead to velocities, the modes must also involve spatial derivatives.

Elongated traps are good for looking for novel superfluid phases: FFLO The coordinate-space HFB calculations are useful in the respect. ASLDA calculations include local polarizations, i.e., different Hartree potentials for two-spin components, washed out the deformation effect of the superfluid core.

In an ultracold, superfluid Fermi gas, measurements of second sound — a wave in which the superfluid and normal components of the gas oscillate in antiphase — make it possible to determine the. A fermionic condensate is a superfluid phase formed by fermionic particles at low is closely related to the Bose–Einstein condensate, a superfluid phase formed by bosonic atoms under similar conditions.

The earliest recognized fermionic condensate described the state of electrons in a superconductor; the physics of other examples including recent work with. Collective excitations of dilute Bose-Fermi superfluid mixtures Using the effective action formalism, we investigate collective excitations of a dilute mixture of a Bose gas and a two component Fermi gas when both bosons and fermions have undergone superfluid transitions.

We show that there is a repulsion between Bogoliubov and Anderson Cited by: 1. Local Density Functional Theory for Superfluid Fermionic Systems The Unitary Fermi Gas A. Bulgac, arXiv:cond-mat/ Kohn-Sham theorem [] 00 2 3 0 Fermi (), Blatt and Weiskopf () Lee, Huang and Yang () [] []r r r B r B r r A r r r r kr V r r g r m ika a Extension of Kohn-Sham approach to superfluid Fermi systems.

Landau’s theory of Fermi liquids is generalized by incorporating the de Broglie waves diffraction. A newly derived kinetic equation of the Fermi particles is used to derive a general dispersion relation and the excitation of zero sound is studied.

A new mode is found due to the quantum correction. It is shown that the zero sound can exist even in an ideal Fermi by: 3. Furthermore, linear excitations and sound propagation in a cigar-shaped 3D superfluid Fermi gas is described and eigenvalue problems of linear collective excitations for quasi 1D and quasi 2D.

Theory of ultracold atomic Fermi gases Stefano Giorgini Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I Povo, these dilute systems, interactions are characterized by a single parameter, B. Expansion of a superfluid Fermi gas C.

Collective oscillations Cited by: Under the hydrodynamic approximation, the collective excitations for the trapped superfluid Fermi gas in a BCS-BEC crossover in an harmonic trap has been studied in Ref. [9][10][11]. Strongly coupled quantum criticality with a Fermi surface in two dimensions: fractionalization of spin and charge collective modes Item Preview remove-circle Share or Embed This Item.

Fermi liquid theory (also known as Landau–Fermi liquid theory) is a theoretical model of interacting fermions that describes the normal state of most metals at sufficiently low temperatures. The interactions among the particles of the many-body system do not need to be small. The phenomenological theory of Fermi liquids was introduced by the Soviet physicist.

Superfluid systems with no “gap”: 1) Dilute solutions of degenerate 3He in superfluid 4He: Particle-hole spectrum reaches down to ω =0 at q ⫩ 0.

Landau critical velocity vanishes, but system is superfluid. 2) Superfluid 4He at non-zero temperature: Can scatter a phonon of momentum k to –k with zero energy Size: 9MB. A gas of fermions, the class of particle that protons, neutrons, and electrons belong to, can be found in contexts as different as neutron stars and a block of metal.

When the interaction between fermions is on the brink of forming fermion pairs, the thermodynamics of the gas become dependent only on the gas temperature and density. Ku et al.

(p. [][1], Cited by: Bose-Fermi Systems • Experiment with. 6. Li Li isotopes • Excitation of center of mass modes: first sounds • Simple model • Critical velocity for two-superfluid counterflow • Perspectives.

Outline. 7Li and 6Li isotopes: • Production of a Bose-Fermi double superfluid.