Current-voltage characteristics and the zero-resistance state in a 2DEG

Details Current-voltage characteristics and the zero-resistance state in a 2DEG Current-voltage characteristics and the zero-resistance state in a 2DEG

2003-03-25

arxiv.org/abs/cond-mat/0303530v3

Phys. Rev. B 67, 241303(R) (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; replaced with final version

Scientific paper

10.1103/PhysRevB.67.241303

We study the current-voltage characteristics (CVC) of two-dimensional electron gases (2DEG) with microwave induced negative conductance in a magnetic field. We show that due to the Hall effect, strictly speaking there is no distinction between N- and S-shaped CVCs. Instead the observed CVC depends on the experimental setup with, e.g., an N-shaped CVC in a Corbino disc geometry corresponding to an S-shaped CVC in a Hall bar geometry in a strong magnetic field. We argue that instabilities of homogeneous states in regions of negative differential conductivity lead to the observation of zero resistance in Hall bars and zero conductance in Corbino discs and we discuss the structure of current and electric field domains.

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