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By using the effective bosonic spin theory, which is recently proposed byDemler and Das Sarma [ Phys. Rev. Lett. 82, 3895 (1999) ], we analyze theeffect of an external in-plane magnetic field on the magnetic phase transitionsof the bilayer quantum Hall system at filling factor nu=2. It is found that thequantum 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 layerseparations and interlayer tunneling amplitudes is shown. We find that thecritical tilted angles being calculated agree very well with the reportedvalues. Moreover, a universal critical exponent for the transition from thecanted antiferromagnetic phase to the ferromagnetic phase is found to be equalto 1/2 within the present effective theory.Comment: RevTeX, 4 pages with 3 EPS figures include

physical review. b, condensed matter

Effect of an in-plane magnetic field on magnetic phase transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>bilayer quantum Hall systems

Effect of an in-plane magnetic field on magnetic phase transitions inν=2bilayer quantum Hall systems