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2D gapless topological superfluids generated by pairing phases.

Jiapei Zhuang1, Ching-Yu Huang2, Po-Yao Chang1

  • 1Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 26, 2022
PubMed
Summary
This summary is machine-generated.

We explored a Rydberg-dressed Fermi gas in an optical lattice, discovering a new gapless topological superfluid. This superfluid exhibits unique edge states and distinct critical temperatures, revealing complex many-body effects.

Keywords:
Majorana zero modesRydberg atomcold atomtopological superfluids

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Ultracold atomic gases

Background:

  • Rydberg-dressed Fermi gases offer a tunable platform for exploring quantum phenomena.
  • Bilayer optical lattices enable the study of interacting quantum systems in layered structures.
  • Topological superfluids possess unique properties arising from their non-trivial band topology.

Purpose of the Study:

  • Investigate the ground state phase diagram of a Rydberg-dressed Fermi gas in a bilayer optical lattice.
  • Analyze the finite temperature phase transitions of this system.
  • Characterize the emergent topological phases and their properties.

Main Methods:

  • Self-consistent mean-field calculations were employed to determine the phase diagram.
  • Analysis of effective finite-ranged attraction induced by Rydberg dressing.
  • Calculation of quantized topological charges and edge state properties.

Main Results:

  • A novel gapless topological superfluid phase was identified.
  • Spontaneous modulation of phases between s-wave and p-wave pairing was observed.
  • A zero-energy flat band at the edges, characteristic of topological edge states, was found.
  • Two distinct critical temperatures were determined for the finite temperature phase diagram.

Conclusions:

  • The study reveals a new topological phase in Rydberg-dressed Fermi gases.
  • The interplay between inter-layer pairing and spontaneous phase modulation leads to unique topological properties.
  • The observed phenomena highlight the significant role of many-body effects in paired topological superfluids.