Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-08-14
Phys. Rev. B 60, R13985 (1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
RevTeX, 4 pages with 3 EPS figures included
Scientific paper
10.1103/PhysRevB.60.R13985
By using the effective bosonic spin theory, which is recently proposed by Demler and Das Sarma [ Phys. Rev. Lett. 82, 3895 (1999) ], we analyze the effect of an external in-plane magnetic field on the magnetic phase transitions of the bilayer quantum Hall system at filling factor nu=2. It is found that the quantum phase diagram is modified by the in-plane magnetic field. Therefore, quantum phase transitions can be induced simply by tilting the magnetic field. The general behavior of the critical tilted angle for different layer separations and interlayer tunneling amplitudes is shown. We find that the critical tilted angles being calculated agree very well with the reported values. Moreover, a universal critical exponent for the transition from the canted antiferromagnetic phase to the ferromagnetic phase is found to be equal to 1/2 within the present effective theory.
Chang Ming-Che
Yang Min-Fong
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