Spin-Dependent Phase Diagram of the νT=1 Bilayer Electron System

P. Giudici, K. Muraki, N. Kumada, Y. Hirayama, and T. Fujisawa
Phys. Rev. Lett. 100, 106803 – Published 12 March 2008

Abstract

We show that the spin degree of freedom plays a decisive role in the phase diagram of the νT=1 bilayer electron system using an in-plane field B in the regime of negligible tunneling. We observe that the phase boundary separating the quantum Hall and compressible states at d/B=1.90 for B=0 (d: interlayer distance, B: magnetic length) steadily shifts with B before saturating at d/B=2.33 when the compressible state becomes fully polarized. Using a simple model for the energies of the competing phases, we can quantitatively describe our results. A new phase diagram as a function of d/B and the Zeeman energy is established and its implications as to the nature of the phase transition are discussed.

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  • Received 23 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.106803

©2008 American Physical Society

Authors & Affiliations

P. Giudici1, K. Muraki1, N. Kumada1, Y. Hirayama1,2,*, and T. Fujisawa1

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
  • 2SORST-JST, 4-1-8 Honmachi, Kawaguchi 331-0012, Japan

  • *Present address: Department of Physics, Tohoku University, Sendai 980-8578, Japan.

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Vol. 100, Iss. 10 — 14 March 2008

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