期刊
SCIENCE
卷 362, 期 6412, 页码 324-328出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aar6855
关键词
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资金
- Swiss National Science Foundation
- NCCR QSIT
- EU Graphene Flagship Project
Suspended Bernal-stacked graphene multilayers up to an unexpectedly large thickness exhibit a broken-symmetry ground state whose origin remains to be understood. We show that a finite-temperature second-order phase transition occurs in multilayers whose critical temperature (T-c) increases from 12 kelvins (K) in bilayers to 100 K in heptalayers. A comparison of the data with a phenomenological model inspired by a mean-field approach suggests that the transition is associated with the appearance of a self-consistent valley-and spin-dependent staggered potential that changes sign from one layer to the next, appearing at T-c and increasing upon cooling. The systematic evolution with thickness of several measured quantities imposes constraints on any microscopic theory aiming to analyze the nature of electronic correlations in this system.
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