Strong Correlation to Weak Correlation Phase Transition in Bilayer Quantum Hall Systems

Details Strong Correlation to Weak Correlation Phase Transition in Bilayer Quantum Hall Systems Strong Correlation to Weak Correlation Phase Transition in Bilayer Quantum Hall Systems

2000-06-20

arxiv.org/abs/cond-mat/0006309v2

Phys. Rev. Lett. 86, 1849 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures included, version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.1849

At small layer separations, the ground state of a nu=1 bilayer quantum Hall system exhibits spontaneous interlayer phase coherence and has a charged-excitation gap E_g. The evolution of this state with increasing layer separation d has been a matter of controversy. In this letter we report on small system exact diagonalization calculations which suggest that a single phase transition, likely of first order, separates coherent incompressible (E_g >0) states with strong interlayer correlations from incoherent compressible states with weak interlayer correlations. We find a dependence of the phase boundary on d and interlayer tunneling amplitude that is in very good agreement with recent experiments.

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