Hamiltonian ratchet of conventional pure quasi-2D electron system

Details Hamiltonian ratchet of conventional pure quasi-2D electron system Hamiltonian ratchet of conventional pure quasi-2D electron system

2009-04-15

arxiv.org/abs/0904.2341v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

We trace a simple mechanical model of a ratchet, and embed its setup in a conventional quasi-two-dimensional electron system in a semiconductor heterostructure. Expressed are two distinct microscopic mechanisms for such systems to serve as quantum ratchets producing the in-plane directed current from zero-mean time-dependent electric fields. The effective-mass swap ratchet is based on modulation of the mobility through alteration of the electron's effective mass. Modulation of the strength of the effective in-plane electric field marks the skin-effect ratchet. They can generate both linear and circular photocurrents, the later taking place in the dissipationless regime.

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