Theoretical Approach to the Gauge Invariant Linear Response Theories for Ultracold Fermi Gases with Pseudogap
Joint Authors
Source
Advances in Condensed Matter Physics
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-10-01
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Recent experimental progress allows for exploring some important physical quantities of ultracold Fermi gases, such as the compressibility, spin susceptibility, viscosity, optical conductivity, and spin diffusivity.
Theoretically, these quantities can be evaluated from suitable linear response theories.
For BCS superfluid, it has been found that the gauge invariant linear response theories can be fully consistent with some stringent consistency constraints.
When the theory is generalized to stronger than BCS regime, one may meet serious difficulties to satisfy the gauge invariance conditions.
In this paper, we try to construct density and spin linear response theories which are formally gauge invariant for a Fermi gas undergoing BCS-Bose-Einstein Condensation (BEC) crossover, especially below the superfluid transition temperature Tc.
We adapt a particular t-matrix approach which is close to the G0G formalism to incorporate noncondensed pairing in the normal state.
We explicitly show that the fundamental constraints imposed by the Ward identities and Q-limit Ward identity are indeed satisfied.
American Psychological Association (APA)
Guo, Hao& He, Yan. 2015. Theoretical Approach to the Gauge Invariant Linear Response Theories for Ultracold Fermi Gases with Pseudogap. Advances in Condensed Matter Physics،Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1052279
Modern Language Association (MLA)
Guo, Hao& He, Yan. Theoretical Approach to the Gauge Invariant Linear Response Theories for Ultracold Fermi Gases with Pseudogap. Advances in Condensed Matter Physics No. 2015 (2015), pp.1-9.
https://search.emarefa.net/detail/BIM-1052279
American Medical Association (AMA)
Guo, Hao& He, Yan. Theoretical Approach to the Gauge Invariant Linear Response Theories for Ultracold Fermi Gases with Pseudogap. Advances in Condensed Matter Physics. 2015. Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1052279
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052279