Quantum ratchet in two-dimensional semiconductors with Rashba spin-orbit interaction.

Abstract:

:Ratchet is a device that produces direct current of particles when driven by an unbiased force. We demonstrate a simple scattering quantum ratchet based on an asymmetrical quantum tunneling effect in two-dimensional electron gas with Rashba spin-orbit interaction (R2DEG). We consider the tunneling of electrons across a square potential barrier sandwiched by interface scattering potentials of unequal strengths on its either sides. It is found that while the intra-spin tunneling probabilities remain unchanged, the inter-spin-subband tunneling probabilities of electrons crossing the barrier in one direction is unequal to that of the opposite direction. Hence, when the system is driven by an unbiased periodic force, a directional flow of electron current is generated. The scattering quantum ratchet in R2DEG is conceptually simple and is capable of converting a.c. driving force into a rectified current without the need of additional symmetry breaking mechanism or external magnetic field.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ang YS,Ma Z,Zhang C

doi

10.1038/srep07872

subject

Has Abstract

pub_date

2015-01-19 00:00:00

pages

7872

issn

2045-2322

pii

srep07872

journal_volume

5

pub_type

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