Chiral p-wave pairing of ultracold fermionic atoms due to a quadratic band touching

doi:10.1088/1674-1056/27/2/027402

Abstract

We study the superfuild ground state of ultracold fermions in optical lattices with a quadratic band touching. Examples are a checkerboard lattice around half filling and a kagome lattice above one third filling. Instead of pairing between spin states, here we focus on pairing interactions between different orbital states. We find that our systems have only odd-parity (orbital) pairing instability while the singlet (orbital) pairing instability vanishes thanks to the quadratic band touching. In the mean field level, the ground state is found to be a chiral p-wave pairing superfluid (mixed with finite f-wave pairing order-parameters) which supports Majorana fermions.

Keywords: degenerate cold fermionic atoms topological states Majorana fermions

Received: 30 November 2017
Revised: 21 December 2017
Accepted manuscript online:

PACS:	74.20.Rp	(Pairing symmetries (other than s-wave))
	67.85.Lm	(Degenerate Fermi gases)
	03.65.Vf	(Phases: geometric; dynamic or topological)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11675116) and the Soochow University, China.

Corresponding Authors: Jian-Hua Jiang
E-mail: jianhuajiang@suda.edu.cn

About author: 74.20.Rp; 67.85.Lm; 03.65.Vf

Cite this article:

Hai-Xiao Wang(王海啸), Zi-Heng Liu(刘子衡), Jian-Hua Jiang(蒋建华) Chiral p-wave pairing of ultracold fermionic atoms due to a quadratic band touching 2018 Chin. Phys. B 27 027402

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Chiral p-wave pairing of ultracold fermionic atoms due to a quadratic band touching

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