Condensed-Matter Physics & Materials Science Seminar

"Effects of electric field on resistance of two dimensional electrons in a magnetic field"

Presented by Sergey Vitkalov, Physics Department of the City University of NY

Thursday, December 13, 2007, 1:30 pm — Small seminar room, Bldg. 510

The nonlinear properties of highly mobile two dimensional electrons
in AlGaAs/GaAs heterojunctions is a subject of considerable current
interest. Strong oscillations of the longitudinal resistance induced by
microwave radiation have been found at magnetic fields which satisfy the condition ω=nωC where ω is the microwave frequency, ωC is cyclotron frequency and n=1,2... At high levels of the
microwave excitations the minima of the oscillations can reach values
close to zero. This so-called zero resistance state stimulated extensive theoretical interest.

In my talk I will discuss recent progress in this area. We have found experimentally that DC electric field E_dc suppresses strongly the resistance of the 2D electrons in magnetic field. At low temperatures and at finite electric field E_dc>E_0 2D electron system demonstrates quasi-stationary state with zero differential resistance.
The experiments reveal dominant mechanism of nonlinearity in highly mobile 2D electron systems in strong magnetic field. The effects are due to strong spectral electron diffusion induced by the DC electric field [1,2].


1. A. A. Bykov, Jing-qiao, Zhang, Sergey Vitkalov, , A. K. Kalagin, A. K. Bakarov “Zero differential resistance state in a two-dimensional electron system in strong magnetic field.”Phys. Rev. Lett. 99, 116801 (2007)


2. Jing-qiao Zhang, Sergey Vitkalov, A. A. Bykov, A. K. Kalagin, A. K. Bakarov “Effect of DC electric field on longitudinal resistance of two dimensional electrons in a magnetic field”, Phys. Rev. B (Rapid Communications) 75, R081305 (2007)

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