Finite-temperature phase transitions in $ν=2$ bilayer quantum Hall systems

Details Finite-temperature phase transitions in $ν=2$ bilayer quantum Hall systems Finite-temperature phase transitions in $ν=2$ bilayer quantum Hall systems

1999-09-20

arxiv.org/abs/cond-mat/9909282v1

Phys. Rev. B 61, R2429 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 5 pages with 3 EPS figures included

Scientific paper

10.1103/PhysRevB.61.R2429

In this paper, the influence of an in-plane magnetic field B_\parallel on the finite-temperature phase transitions in nu=2 bilayer quantum Hall systems are examined. It is found that there can exist two types of finite-temperature phase transitions. The first is the Kosterlitz-Thouless (KT) transitions, which can have an unusual non-monotonic dependence on B_\parallel; the second type originates from the crossing of energy levels and always increases with B_\parallel. Based on these results, we point out that the threshold temperature observed in the inelastic light scattering experiments cannot be the KT transition temperature, because the latter shows a totally different B_\parallel-dependence as compared with the experimental observation. Instead, it should be the level-crossing temperature, which we found agrees with the B_\parallel-dependence observed. Moreover, combining the knowledge of these two transition temperatures, a complete finite-temperature phase diagram is presented.

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