Charged skyrmions and topological origin of superconductivity in magic-angle graphene.
Charged skyrmions and topological origin of superconductivity in magic-angle graphene.
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DOI:
10.1126/sciadv.abf5299
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发表时间:
2021-05
期刊:
影响因子:
13.6
通讯作者:
Vishwanath A
中科院分区:
文献类型:
--
作者:
Khalaf E;Chatterjee S;Bultinck N;Zaletel MP;Vishwanath A
Pairing from topology explains superconductivity in magic-angle graphene and predicts other unconventional superconductors. Topological solitons, a class of stable nonlinear excitations, appear in diverse domains as in the Skyrme model of nuclear forces. Here, we argue that similar excitations play an important role in a remarkable material obtained on stacking and twisting two sheets of graphene. Close to a magic twist angle, insulating behavior is observed, which gives way to superconductivity on doping. Here, we propose a unifying description of both observations. A symmetry breaking condensate leads to the ordered insulator, while topological solitons in the condensate—skyrmions—are shown to be charge 2e bosons. Condensation of skyrmions leads to a superconductor, whose physical properties we calculate. More generally, we show how topological textures can mitigate Coulomb repulsion and provide a previously unexplored route to superconductivity. Our mechanism not only clarifies why several other moiré materials do not show superconductivity but also points to unexplored platforms where robust superconductivity is anticipated.
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