Phase Dependent Quantum Phase Diagram of Paired Topological Superfluids of Fermionic Rydberg Atoms
Jiapei Zhuang1*, Ching-Yu Huang2, Daw-Wei Wang3,1
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
2Department of Applied Physics, Tunghai University, Taichung, Taiwan
3Physics Division, National Center for Theoretical Sciences, P.O.Box 2-131, Hsinchu, Taiwan
* Presenter:Jiapei Zhuang,
In this talk, we will introduce an exotic system, where spin-polarized fermionic atoms are loaded in a bilayer optical lattice. A weak light coupling to the Rydberg excited states is introduced to generate a finite range attractive interaction, which could support both intra-layer p-wave superfluidity as well as the inter-layer s-wave superfluidity in different parameter regimes. We find that the s-wave superfluidity and p-wave superfluidity could co-exist after certain modulation of their relative phases, making an interesting gapless topological superfluid from a paired gapped topological superfluidity. We systematically investigate the ground state energy and quantum phase diagram of such a system, providing the phase-modulation mechanism for the presence of gapless superfluidity.

Keywords: topological superconductors, Topological order, Majorana fermion, Quantum phase transitions, Optical lattice