Insulating and fractional quantum hall states in the first excited Landau level.
The observation of new insulating phases of two-dimensional electrons in the first excited Landau level is reported. These states, which are manifested as reentrant integer quantized Hall effects, exist alongside well-developed even-denominator fractional quantized Hall states at nu = 7/2 and 5/2 and new odd-denominator states at nu = 3+1/5 and 3+4/5.
Eisenstein
J P
JP
California Institute of Technology, Pasadena, California 91125, USA.
Cooper
K B
KB
Pfeiffer
L N
LN
West
K W
KW