A Realistic Model for Observing Spin-Balanced Fulde–Ferrell Superfluid in Honeycomb Lattices

doi:10.1088/0256-307X/33/8/080303

Chin. Phys. Lett.

2016, Vol. 33

Issue (08): 080303 DOI: 10.1088/0256-307X/33/8/080303

GENERAL

A Realistic Model for Observing Spin-Balanced Fulde–Ferrell Superfluid in Honeycomb Lattices

Bei-Bing Huang^**

Department of Physics, Yancheng Institute of Technology, Yancheng 224051

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Bei-Bing Huang 2016 Chin. Phys. Lett. 33 080303

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Abstract The combination of spin–orbit coupling (SOC) and in-plane Zeeman field breaks time-reversal and inversion symmetries of Fermi gases and becomes a popular way to produce single plane wave Fulde–Ferrell (FF) superfluid. However, atom loss and heating related to SOC have impeded the successful observation of FF state until now. In this work, we propose the realization of spin-balanced FF superfluid in a honeycomb lattice without SOC and the Zeeman field. A key ingredient of our scheme is generating complex hopping terms in original honeycomb lattices by periodical driving. In our model the ground state is always the FF state, thus the experimental observation has no need of fine tuning. The other advantages of our scheme are its simplicity and feasibility, and thus may open a new route for observing FF superfluids.

Received: 27 March 2016 Published: 31 August 2016

PACS:	03.75.Ss	(Degenerate Fermi gases)
	05.30.Fk	(Fermion systems and electron gas)
	67.85.-d	(Ultracold gases, trapped gases)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/8/080303 OR https://cpl.iphy.ac.cn/Y2016/V33/I08/080303

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