Phase Transitions in the Bilayer $ν=2/3$ Quantum Hall Effect

Details Phase Transitions in the Bilayer $ν=2/3$ Quantum Hall Effect Phase Transitions in the Bilayer $ν=2/3$ Quantum Hall Effect

2001-12-23

arxiv.org/abs/cond-mat/0112434v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

We measured the magnetoresistance of bilayer quantum Hall (QH) effects at the fractional filling factor $\nu =2/3$ by changing the total electron density and the density difference between two layers. Three different QH states were separated by two types of phase transition: One is the spin transition and the other is the pseudospin transition. In addition, two different hystereses were detected, one of which is specific to bilayer systems. The phase transitions and the hystereses are described well by a composite fermion model extended to a bilayer system.

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