Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling

被引：15

作者：

Kumada, N. ^{[1
]}

Iwata, K. ^{[2
]}

Tagashira, K. ^{[3
]}

Shimoda, Y. ^{[3
]}

Muraki, K. ^{[1
]}

Hirayama, Y. ^{[1
,4
]}

Sawada, A. ^{[2
]}

机构：

[1] NTT Corp, NTT Basic Res Labs, Kanagawa 2430198, Japan

[2] Kyoto Univ, Res Ctr Low Temp & Mat Sci, Kyoto 6068502, Japan

[3] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[4] SORST JST, Kawaguchi, Saitama 3310012, Japan

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.77.155324

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study effects of tilted magnetic fields on energy levels in a double-quantum-well (DQW) system, focusing on the coupling of subbands and Landau levels (LLs). The subband-LL coupling induces anticrossings between LLs directly manifested in the magnetoresistance. The anticrossing gap becomes larger than the spin splitting at the tilting angle theta similar to 20 degrees and larger than the cyclotron energy at theta similar to 50 degrees, demonstrating that the subband-LL coupling exerts a strong influence on quantum Hall states even at a relatively small theta and plays a dominant role for larger theta. We also find that when the DQW potential is asymmetric, LL coupling occurs even within a subband. Calculations including higher-order coupling reproduce the experimental results quantitatively well.

引用

页数：7

共 20 条

[1] Commensurate-incommensurate transitions of quantum Hall stripe states in double quantum well systems -: art. no. 205315 [J].