Fermionic superfluid from a bilayer band insulator in an optical lattice

Yogeshwar Prasad, Amal Medhi, and Vijay B. Shenoy
Phys. Rev. A 89, 043605 – Published 7 April 2014

Abstract

We propose a model to realize a fermionic superfluid state in an optical lattice circumventing the cooling problem. Our proposal exploits the idea of tuning the interaction in a characteristically low-entropy state, a band insulator in an optical bilayer system, to obtain a superfluid. By performing a detailed analysis of the model including fluctuations and augmented by a variational quantum Monte Carlo calculation of the ground state, we show that the superfluid state obtained has a high transition temperature of the order of the hopping energy. Our system is designed to suppress other competing orders such as a charge density wave. We suggest a laboratory realization of this model via an orthogonally shaken optical lattice bilayer.

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  • Received 1 March 2014

DOI:https://doi.org/10.1103/PhysRevA.89.043605

©2014 American Physical Society

Authors & Affiliations

Yogeshwar Prasad1, Amal Medhi1,2, and Vijay B. Shenoy1,*

  • 1Center for Condensed Matter Theory, Indian Institute of Science, Bangalore 560012, India
  • 2School of Physics, IISER Thiruvananthapuram, CET Campus, Thiruvananthapuram 695016, India

  • *shenoy@physics.iisc.ernet.in

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Vol. 89, Iss. 4 — April 2014

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