TUNNELING BETWEEN 2 2-DIMENSIONAL ELECTRON-SYSTEMS IN A STRONG MAGNETIC-FIELD

Article

关键词: 2-DIMENSIONAL WIGNER CRYSTAL;    QUANTUM HALL REGIME;    COULOMB BLOCKADE;    COLLECTIVE MODES;    SPECTROSCOPY;    EXCITATIONS;    SCATTERING;    GAPS;    GAS;   

DOI  :  10.1103/PhysRevB.50.4671

来源: SCIE

【 摘 要 】

We calculate the tunnel current between two parallel two-dimensional electron systems in a strong perpendicular magnetic field. We model the strongly correlated electron systems by Wigner crystals and describe their low-energy dynamics in terms of magnetophonons. The effects of the magnetophonons on the tunneling processes can be described by an exactly solvable independent-boson model. A tunneling electron shakes up magnetophonons, which results in a conductance peak that is displaced away from sere voltage and broadened compared with the case of no magnetic field. At low temperatures and low enough voltages the tunneling conductance is strongly suppressed and the I-V characteristics exhibit a power-law behavior. We also analyze the effects of excitation of magnetoplasmons, which have a gap equal to the cyclotron energy and therefore give rise to a second peak in the I-V curves. Most of our results are in good quantitative agreement with the recent experiments by Eisenstein, Pfeiffer, and West [Phys. Rev. Lett. 69, 3804 (1992)].

【 授权许可】

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