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

N. Kumada, K. Iwata, K. Tagashira, Y. Shimoda, K. Muraki, Y. Hirayama, A. Sawada

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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 θ∼20° and larger than the cyclotron energy at θ∼50°, demonstrating that the subband-LL coupling exerts a strong influence on quantum Hall states even at a relatively small θ and plays a dominant role for larger θ. 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.

Original languageEnglish
Article number155324
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 2008 Apr 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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