Zero-differential resistance state of two-dimensional electron systems in strong magnetic fields.
We report the observation of a zero-differential resistance state (ZDRS) in response to a direct current above a threshold value I>I th applied to a two-dimensional system of electrons at low temperatures in a strong magnetic field. Entry into the ZDRS, which is not observable above several Kelvins, is accompanied by a sharp dip in the differential resistance. Additional analysis reveals an instability of the electrons for I>I th and an inhomogeneous, nonstationary pattern of the electric current. We suggest that the dominant mechanism leading to the new electron state is a redistribution of electrons in energy space induced by the direct current.
Bykov
A A
AA
Physics Department, City College of the City University of New York, New York 10031, USA.
Zhang
Jing-qiao
JQ
Vitkalov
Sergey
S
Kalagin
A K
AK
Bakarov
A K
AK