Enhancement of Subband Effective Mass in Ag/Ge(111) Thin Film Quantum Wells

ORAL

Abstract

Subband dispersions of quantum-well states in Ag films on Ge(111) have been determined by angle-resolved photoemission. The effective masses of the subbands at the zone center increase substantially for decreasing film thicknesses. This peculiar behavior is attributed to a kinetic constraint for standing wave formation governed by a momentum-dependent phase shift function. No evidence is found for in-plane electron localization within the confined geometry.

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Authors

  • Shu-Jung Tang

    • Department of Physics and Astronomy, National Tsing Hua University

  • Wen-Kai Chang

    • Department of Physics and Astronomy, National Tsing Hua University

  • Yu-Mei Chiu

    • Department of Electrophysics, National Chiao-Tung University

  • Hsin-Yi Chen

    • Department of Physics and Astronomy, National Tsing Hua University

  • Cheng-Maw Cheng

    • National Synchrotron Radiation Research Center

  • Ku-Ding Tsuei

  • Tom Miller

    • Department of Physics, University of Illinois at Urbana-Champaign

  • Tai-Chang Chiang

    • Department of Physics, University of Illinois at Urbana-Champaign