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Fermions in Synthetic Non-Abelian Gauge Fields

Sanyal, Sambuddha and Ghosh, Sudeep Kumar and Vyasanakere, Jayantha P (2014) Fermions in Synthetic Non-Abelian Gauge Fields. In: JOURNAL OF THE INDIAN INSTITUTE OF SCIENCE, 94 (2). pp. 199-216.

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Quantum emulation property of the cold atoms has generated a lot of interest in studying systems with synthetic gauge fields. In this article, we describe the physics of two component Fermi gas in the presence of synthetic non-Abelian SU(2) gauge fields. Even for the non-interacting system with the gauge fields, there is an interesting change in the topology of the Fermi surface by tuning only the gauge field strength. When a trapping potential is used in conjunction with the gauge fields, the non-interacting system has the ability to produce novel Hamiltonians and show characteristic change in the density profile of the cloud. Without trap, the gauge fields act as an attractive interaction amplifier and for special kinds of gauge field configurations, there are two-body bound states for any attraction even in three dimensions. For a many body system, the gauge fields can induce a crossover from a weak superfluid to a strong superfluid with transition temperature as high as the Fermi temperature. The superfluid state obtained for a very large gauge field strength is a superfluid of new kind of bosons, called ``rashbons'', the properties of which are independent of its constituent two component fermions and are solely determined by the gauge field strength. We also discuss the collective excitations over the superfluid ground states and the experimental relevance of the physics.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the INDIAN INST SCIENCE, INDIAN INST SCIENCE, BANGALORE 560012, INDIA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Sep 2014 09:13
Last Modified: 03 Sep 2014 12:09
URI: http://eprints.iisc.ac.in/id/eprint/49739

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