Even-denominator fractional quantum Hall states in bilayer graphene

被引：119

作者：

Li, J. I. A. ^{[1
]}

Tan, C. ^{[2
,3
]}

Chen, S. ^{[4
]}

Zeng, Y. ^{[1
]}

Taniguehi, T. ^{[5
]}

Watanabe, K. ^{[5
]}

Hone, J. ^{[2
]}

Dean, C. R. ^{[1
]}

机构：

[1] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

[2] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[3] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA

[4] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA

[5] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki, Japan

来源：

SCIENCE | 2017年 / 358卷 / 6363期

基金：

美国国家科学基金会;

关键词：

LANDAU-LEVEL; FILLING FACTOR; QUANTIZATION; COMPUTATION; ANYONS; PHASES;

D O I：

10.1126/science.aao2521

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 distinct Landau level spectrum of bilayer graphene (BLG) is predicted to support a non-abelian even-denominator fractional quantum Hall (FQH) state similar to the (5)/(2) state first identified in GaAs. However, the nature of this state has remained difficult to characterize. Here, we report transport measurements of a robust sequence of even-denominator FQH in dual-gated BLG devices. Parallel field measurement confirms the spin-polarized nature of the ground state, which is consistent with the Pfaffian/anti-Pfaffian description. The sensitivity of the even-denominator states to both filling fraction and transverse displacement field provides new opportunities for tunability. Our results suggest that BLG is a platform in which topological ground states with possible non-abelian excitations can be manipulated and controlled.

引用

页码：648 / 651

页数：4

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