Observation of Conductance Fluctuation due to Zitterbewegung in InAs 2-dimentional Electron Gas

33rd International Conference on the Physics of Semiconductors

Iwasaki, Y.^1 ; Hashimoto, Y.^1 ; Nakamura, T.^1 ; Katsumoto, S.^1

Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Chiba, Kashiwa

277-8581, Japan^1

关键词: Conductance fluctuation;    Dirac equations;    Kinetic constant;    Numerical calculation;    Rashba-type spin-orbit;    Simple modeling;    Spatial coordinates;    Zitterbewegung;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/864/1/012054/pdf
DOI  :  10.1088/1742-6596/864/1/012054

来源: IOP

【 摘 要 】

Zitterbewegung (ZB; trembling motion) is one of the peculiar phenomena predicted in the Dirac equation in that the velocity and the spatial coordinate cannot be well defined kinetic constant. While the ZB in vacuum is far out of reach, feasibility of observation in solids has been discussed though very few experiments have been reported yet. We here report the ZB in two-dimensional electron gas with strong Rashba-type spin-orbit coupling causes large fluctuation in conductance. Such an experiment was impossible until recent development of point contact injectors with spin-polarised electrons. Numerical calculations on a simple model successfully simulate the experimental observations.