Rashba-spin-orbit coupling in interacting fermi gases

Vyasanakere, Jayanth (2018) Rashba-spin-orbit coupling in interacting fermi gases. In: Synthetic Spin-Orbit Coupling in Cold Atoms. World Scientific, pp. 125-175. ISBN 9789813272521

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The possibility of employing cold atomic gases as emulators of condensed matter Hamiltonians has got boosted up by the birth and growth of the field of synthetic spin-orbit coupling. This being the case in the context of both bosonic and fermionic systems, here we discuss interacting Fermi gas in three spatial dimensions in presence of uniform synthetic non-Abelian gauge fields that induce a generalized Rashba-spin-orbit coupling (RSOC). We show that in presence of a class of RSOC, however small, a two-particle bound state exists even for a vanishingly small attraction. We discover that the fermion system can evolve to a Bose-Einstein condensate of a novel boson called the rashbon, whose properties are determined solely by RSOC and not by the interaction between the fermions or the fermion density. Most interestingly, via a study of collective excitations of the superfluid state, the rashbon-rashbon interaction is shown to be independent of the constituent fermion-fermion interaction. By constructing a fluctuation theory, we demonstrate that RSOC enhances the transition temperature of a weak Fermi superfluid to the order of Fermi temperature.

Item Type: Book Section
Authors: Vyasanakere, Jayanth
Uncontrolled Keywords: Rashba-spin-orbit coupling (RSOC), Fermi gases
Subjects: Natural Sciences > Physics
Divisions: Azim Premji University > School of Arts and Sciences
Full Text Status: Restricted
URI: http://publications.azimpremjiuniversity.edu.in/id/eprint/2755
Publisher URL: https://doi.org/10.1142/9789813272538_0003

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