期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.266801
关键词
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资金
- EU
- ANR [2010-BLANC-041902]
- DOE Office of Basic Energy Sciences [DE-FG02-06ER46305, DE-AC02-05CH1123]
- NSF [DMR-0958596]
- Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under US Department of Energy [DE-AC02-05CH11231]
- institute for condensed matter theory at the University of Illinois at Urbana-Champaign
We show that strained or deformed honeycomb lattices are promising platforms to realize fractional topological quantum states in the absence of any magnetic field. The strain-induced pseudomagnetic fields are oppositely oriented in the two valleys and can be as large as 60-300 T as reported in recent experiments. For strained graphene at neutrality, a spin-or a valley-polarized state is predicted depending on the value of the on-site Coulomb interaction. At fractional filling, the unscreened Coulomb interaction leads to a valley-polarized fractional quantum Hall liquid which spontaneously breaks time-reversal symmetry. Motivated by artificial graphene systems, we consider tuning the short-range part of interactions and demonstrate that exotic valley symmetric states, including a valley fractional topological insulator and a spin triplet superconductor, can be stabilized by such interaction engineering.
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