Microwave induced negative resistance states in 2D electron gas with periodic modulation

Details Microwave induced negative resistance states in 2D electron gas with periodic modulation Microwave induced negative resistance states in 2D electron gas with periodic modulation

2006-10-23

arxiv.org/abs/cond-mat/0610643v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 1 figure

Scientific paper

We study the microwave-induced photoconductivity of a two-dimensional electron system (2DES) in the presence of a magnetic field and a two-dimensional modulation. The microwave and Landau contributions are exactly taken into account, while the periodic potential is treated perturbatively. The longitudinal resistivity exhibits oscillations, periodic in $\omega / \omega_c$. Negative resistance states (NRS) develop for sufficiently high electron mobility and microwave power. This phenomenon appears in a narrow window region of values of the lattice parameter ($a$), around $a \sim l_B$, where $l_B$ is the magnetic length. It is proposed that these phenomena may be observed in artificially fabricated arrays of periodic scatterers at the interface of ultraclean heterostructures. {73.20.At,05.60.-k, 72.15.Rn}

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