Observation of microwave-induced zero-conductance state in Corbino rings of a two-dimensional electron system.
Using Corbino samples we have observed oscillatory dc conductance in a high-mobility two-dimensional electron system when it is subjected to crossed microwave and magnetic fields. At the strongest of the oscillation minima the conductance is found to be vanishingly small, indicating a macroscopic insulating state associated with this minimum. With increasing voltage bias, a crossover from Ohmic to electron-heating regime is observed.
Yang
C L
CL
Department of Physics, University of Utah, Salt Lake City, UT 84112, USA.
Zudov
M A
MA
Knuuttila
T A
TA
Du
R R
RR
Pfeiffer
L N
LN
West
K W
KW