Please use this identifier to cite or link to this item:
標題: Microwave-induced DC currents in mesoscopic structures
作者: Li, L.C.
Sung, Y.T.
Chang, C.W.
Suen, Y.W.
Chen, K.Y.
Liang, C.T.
Chen, Y.F.
Lee, B.C.
Lee, C.P.
關鍵字: Microwave;Mesoscopic;Photocurrent;Magnetic field;oscillations
Project: Physica E-Low-Dimensional Systems & Nanostructures
期刊/報告no:: Physica E-Low-Dimensional Systems & Nanostructures, Volume 42, Issue 4, Page(s) 1084-1087.
We report the power (P) dependence of microwave (MW)-induced current (I(ph)) of a 1-mu m sized mesoscopic structure fabricated from two-dimensional electron gas in the GaAs/AlGaAs heterostructure at temperature of 1.4 K. MW signals were fed onto the sample through a loop antenna nearby and I(ph) is measured from a pair of ohmic contacts. We found that I(ph) is proportional to P at low-P limit; this dependence has been predicted for diffusion-limited electron transport in mesoscopic systems. By contrast, for large P. the dependence is extremely non-monotonous and complicated; even though its physical origin is still not clear so far, our data suggest it is related to the scattering processes from boundaries and impurities in the mesoscopic structure. We also investigated the symmetry properties against reversal of magnetic field (B) and found that the field-symmetric part of I(ph)(B) is consistent with the variation of magnetoresistance; there exists also an anti-symmetric part, which should be related to time-reversal-symmetry-breaking scattering mechanisms in the channel. (C) 2009 Elsevier B.V. All rights reserved.
ISSN: 1386-9477
DOI: 10.1016/j.physe.2009.11.074
Appears in Collections:期刊論文

Show full item record

Google ScholarTM




Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.