TY - JOUR
T1 - Enhancement of the ν=5/2 fractional quantum Hall state in a small in-plane magnetic field
AU - Liu, Guangtong
AU - Zhang, Chi
AU - Tsui, D. C.
AU - Knez, Ivan
AU - Levine, Aaron
AU - Du, R. R.
AU - Pfeiffer, L. N.
AU - West, K. W.
PY - 2012/5/9
Y1 - 2012/5/9
N2 - Using a 50-nm-width ultraclean GaAs/AlGaAs quantum well, we have studied the Landau level filling factor ν=5/2 fractional quantum Hall effect in a perpendicular magnetic field B∼1.7T and determined its dependence on tilted magnetic fields. Contrary to all previous results, the 5/2 resistance minimum and the Hall plateau are found to strengthen continuously under an increasing tilt angle 0<θ<25°(corresponding to an in-plane magnetic field 0∥<0.8T). In the same range of θ, the activation gaps of both the 7/3 and the 8/3 states are found to increase with tilt. The 5/2 state transforms into a compressible Fermi liquid upon tilt angle θ>60°, and the composite fermion series [2+p/(2p±1), p=1,2] can be identified. Based on our results, we discuss the relevance of a Skyrmion spin texture at ν=5/2 associated with small Zeeman energy in wide quantum wells, as proposed by Wójs et al..
AB - Using a 50-nm-width ultraclean GaAs/AlGaAs quantum well, we have studied the Landau level filling factor ν=5/2 fractional quantum Hall effect in a perpendicular magnetic field B∼1.7T and determined its dependence on tilted magnetic fields. Contrary to all previous results, the 5/2 resistance minimum and the Hall plateau are found to strengthen continuously under an increasing tilt angle 0<θ<25°(corresponding to an in-plane magnetic field 0∥<0.8T). In the same range of θ, the activation gaps of both the 7/3 and the 8/3 states are found to increase with tilt. The 5/2 state transforms into a compressible Fermi liquid upon tilt angle θ>60°, and the composite fermion series [2+p/(2p±1), p=1,2] can be identified. Based on our results, we discuss the relevance of a Skyrmion spin texture at ν=5/2 associated with small Zeeman energy in wide quantum wells, as proposed by Wójs et al..
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U2 - 10.1103/PhysRevLett.108.196805
DO - 10.1103/PhysRevLett.108.196805
M3 - Article
AN - SCOPUS:84861090755
SN - 0031-9007
VL - 108
JO - Physical review letters
JF - Physical review letters
IS - 19
M1 - 196805
ER -