Topological phase transitions driven by next-nearest-neighbor hopping in noncentrosymmetric cold Fermi gases<xref ref-type="fn" rid="cpb141862fn1">*</xref>

Topological phase transitions driven by next-nearest-neighbor hopping in noncentrosymmetric cold Fermi gases*

Wang Rui^a),^b)†, Zhang Cun-Xi^a), Ji Qing-Shan^a)

The energy spectrum with edge states of 2D cold Fermi gases, both spin-singlet and spin-triplet pairings are considered. The system is periodic at the y direction and has two open edges at i _x = 0 and i _x = 100. The unit of energy is set as t . The parameters are v _R = 0.5, Δ _s = 0.6, Δ _p = 0.8; (a) μ = −0.5, H _z = 1, t ′ = 0.3; (b) μ = −0.5, H _z = 2.5, t ′ = 0.3; (c) μ = −0.5, H _z = 4, t ′ = 0.3; (d) μ = −0.5, H _z = 6, t ′ = 0.3; (e) μ = −0.5, H _z = 2.5, t ′ = 0.8; (f) μ = −3, H _z = 3, t ′ = 0.3.