Topological superconductivity with mixed singlet-triplet pairing in moiré transition-metal-dichalcogenide bilayers
arxiv(2024)
摘要
We investigate strong coupling topological superconductivity in twisted
moiré bilayer WSe_2. Our approach is based on an effective t-J model
with displacement-field-dependent complex hoppings, which is treated with the
variational Gutzwiller projection method. The calculated phase diagram contains
domes of topologically nontrivial superconducting phases, with Chern numbers
C=± 2, ± 4. The order parameter is characterized by a mixed
d+id-wave (singlet) and p-ip-wave (triplet) gap symmetry. We also
report on the appearance of an additional topologically trivial extended
s-wave and f-wave paired phase. As we show, by changing the electron
density and displacement field, one can tune the singlet and triplet
contributions to the pairing, as well as induce topological phase transitions
between superconducting states characterized by different values of the Chern
number. We analyze the physical origin of the reported effects and discuss it
briefly in the view of new possibilities for designing unconventional
superconductivity in moiré systems.
更多查看译文
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要