From semimetal to chiral Fulde-Ferrell superfluids
| Autor: | Xiong-Jun Liu, Ting Fung Jeffrey Poon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
FOS: Physical sciences
02 engineering and technology 01 natural sciences Superconductivity (cond-mat.supr-con) Superfluidity symbols.namesake Ultracold atom Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Physics Superconductivity Condensed Matter::Quantum Gases Quantum Physics Chern class Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity Quantum vortex Fermion 021001 nanoscience & nanotechnology Dirac fermion Pairing symbols Quantum Physics (quant-ph) 0210 nano-technology |
| Popis: | The recent realization of two-dimensional (2D) synthetic spin-orbit (SO) coupling opens a broad avenue to study novel topological states for ultracold atoms. Here, we propose a new scheme to realize exotic chiral Fulde-Ferrell superfluid for ultracold fermions, with a generic theory being shown that the topology of superfluid pairing phases can be determined from the normal states. The main findings are two fold. First, a semimetal is driven by a new type of 2D SO coupling whose realization is even simpler than the recent experiment, and can be tuned into massive Dirac fermion phases with or without inversion symmetry. Without inversion symmetry the superfluid phase with nonzero pairing momentum is favored under an attractive interaction. Furthermore, we show a fundamental theorem that the topology of a 2D chiral superfluid can be uniquely determined from the unpaired normal states, with which the topological chiral Fulde-Ferrell superfluid with a broad topological region is predicted for the present system. This generic theorem is also useful for condensed matter physics and material science in search for new topological superconductors. 4 figures, 5 pages + Supplemenrary Material. Figures are updated, typos are corrected |
| Databáze: | OpenAIRE |
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