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Published on: March 23, 2017
Ratchet effects induced by terahertz radiation in heterostructures with a lateral periodic potential
P Olbrich1, E L Ivchenko, R Ravash
1Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.
Abstract:
We report on the observation of the Seebeck ratchet effect. The effect is measured in semiconductor heterostructures with a one-dimensional lateral potential excited by terahertz radiation. The photocurrent generation is based on the combined action of a spatially periodic in-plane potential and a spatially modulated light, which gives rise to a modulation of the local temperature. In addition to the polarization-independent current due to the Seebeck ratchet effect, we observe a photon helicity dependent response and propose a microscopic mechanism to interpret the experimental findings.
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