Gap evolution in v = 1/2 bilayer quantum hall systems

Kentaro Nomura, Daijiro Yoshioka

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Fractional quantum Hall states in bilayer systems at the total filling fraction v = 1/2 are examined numerically within some ranges of layer separation and interlayer tunneling. It is shown that the ground state changes continuously from a two-component state to a one-component state as the interlayer tunneling rate is increased, while the lowest excited state changes discontinuously. This fact explains the unusual behavior of the observed activation energies which reveals an upward cusp as a function of interlayer tunneling. Some trial wave functions for the ground state and quasihole excited states are inspected.

Original languageEnglish
Pages (from-to)2612-2615
Number of pages4
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 2004 Oct
Externally publishedYes


  • Bilayer system
  • Fractional quantum hall effect
  • Quasiparticles
  • Tunneling

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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