Robust fractional quantum Hall effect in the N=2 Landau level in bilayer graphene

被引：28

作者：

Diankov, Georgi ^{[1
]}

Liang, Chi-Te ^{[1
,2
]}

Amet, Francois ^{[3
,4
]}

Gallagher, Patrick ^{[1
]}

Lee, Menyoung ^{[1
]}

Bestwick, Andrew J. ^{[1
]}

Tharratt, Kevin ^{[1
]}

Coniglio, William ^{[5
]}

Jaroszynski, Jan ^{[5
]}

Watanabe, Kenji ^{[6
]}

Taniguchi, Takashi ^{[6
]}

Goldhaber-Gordon, David ^{[1
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[2] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[3] Duke Univ, Dept Phys, Durham, NC 27708 USA

[4] Appalachian State Univ, Dept Phys & Astron, Boone, NC 28608 USA

[5] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[6] Natl Inst Mat Sci, Adv Mat Lab, 1-1 Namiki, Tsukuba, Ibaraki 305, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

美国国家科学基金会;

关键词：

FERMIONS;

D O I：

10.1038/ncomms13908

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The fractional quantum Hall effect is a canonical example of electron-electron interactions producing new ground states in many-body systems. Most fractional quantum Hall studies have focussed on the lowest Landau level, whose fractional states are successfully explained by the composite fermion model. In the widely studied GaAs-based system, the composite fermion picture is thought to become unstable for the N >= 2 Landau level, where competing many-body phases have been observed. Here we report magneto-resistance measurements of fractional quantum Hall states in the N = 2 Landau level (filling factors 4 < vertical bar n vertical bar < 8) in bilayer graphene. In contrast with recent observations of particle-hole asymmetry in the N = 0/N = 1 Landau levels of bilayer graphene, the fractional quantum Hall states we observe in the N = 2 Landau level obey particle-hole symmetry within the fully symmetry-broken Landau level. Possible alternative ground states other than the composite fermions are discussed.

引用

页数：6

共 43 条

[41] Electron correlation in the second Landau level: A competition between many nearly degenerate quantum phases [J].