期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.017001
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Sun Yat-sen University [74130-18841219]
- NSFC [11904417]
- JSPS KAKENHI [18K11345, 18K03552]
- Topological Materials Science KAKENHI on Innovative Areas from JSPS of Japan [JP18H04228]
- Grants-in-Aid for Scientific Research [18K03552] Funding Source: KAKEN
The combination of spin-orbit coupling with interactions results in many exotic phases of matter. In this Letter, we investigate the superconducting pairing instability of the two-dimensional extended Hubbard model with both Rashba and Dresselhaus spin-orbit coupling within the mean-field level at both zero and finite temperature. We find that both first- and second-order time-reversal symmetry breaking topological gapped phases can be achieved under appropriate parameters and temperature regimes due to the presence of a favored even-parity s + id-wave pairing even in the absence of an external magnetic field or intrinsic magnetism. This results in two branches of chiral Majorana edge states on each edge or a single zero-energy Majorana comer state at each comer of the sample. Interestingly, we also find that not only does tuning the doping level lead to a direct topological phase transition between these two distinct topological gapped phases, but also using the temperature as a highly controllable and reversible tuning knob leads to different direct temperature-drivcn topological phase transitions between gapped and gapless topological superconducting phases. Our findings suggest new possibilities in interacting spin-orbit coupled systems by unifying both first- and higher-order topological superconductors in a simple but realistic microscopic model.
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