Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field.
We investigate the double-layer electron system in a parabolic quantum well at filling factor nu=2 in a tilted magnetic field using capacitance spectroscopy. The competition between two ground states is found at the Zeeman splitting appreciably smaller than the symmetric-antisymmetric splitting. Although at the transition point the system breaks up into domains of the two competing states, the activation energy turns out to be finite, signaling the occurrence of a new insulator-insulator quantum phase transition. We interpret the obtained results in terms of a predicted canted antiferromagnetic phase.
Khrapai
V S
VS
Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia.
Deviatov
E V
EV
Shashkin
A A
AA
Dolgopolov
V T
VT
Hastreiter
F
F
Wixforth
A
A
Campman
K L
KL
Gossard
A C
AC