Thermodynamic signatures for topological phase transitions to Majorana and Weyl superfluids in ultracold Fermi gases

Abstract

We discuss the thermodynamic signatures for the topological phase transitions into Majorana and Weyl superfluid phases in ultracold Fermi gases in two and three dimensions in the presence of Rashba spin-orbit coupling and a Zeeman field. We analyze the thermodynamic properties exhibiting the distinct nature of the topological phase transitions linked with the Majorana fermions (2D Fermi gas) and Weyl fermions (3D Fermi gas) which can be observed experimentally, including pressure, chemical potential, isothermal compressibility, entropy, and specific heat, as a function of the interaction and the Zeeman field at both zero and finite temperatures. We conclude that among the various thermodynamic quantities, the isothermal compressibility and the chemical potential as a function of the artificial Zeeman field have the strongest signatures of the topological transitions in both two and three dimensions.

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Cited by in corpus (18)

• Structured Weyl Points in Spin-Orbit Coupled Fermionic Superfluids
• Triangle anomaly in Weyl semi-metals
• Anisotropic Weyl Fermions from Quasiparticle Excitation Spectrum of a 3D Fulde-Ferrell Superfluid
• Type-II Weyl Points in Three-Dimensional Cold Atom Optical Lattices
• Dirac and Weyl Rings in Three Dimensional Cold Atom Optical Lattices
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• Fermion parity gap and exponential ground state degeneracy of the one-dimensional Fermi gas with intrinsic attractive interaction
• Enhanced interaction effects in the vicinity of the topological transition
• Signatures of topological phase transitions in the s-wave superconductor at finite temperature
• Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gases