Spatial imaging of two-dimensional electronic states in semiconductor quantum wells |
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| Authors: | Suzuki K Kanisawa K Janer C Perraud S Takashina K Fujisawa T Hirayama Y |
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| Institution: | NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan. kyoichi@will.brl.ntt.co.jp |
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| Abstract: | We measure the spatial distribution of the local density of states (LDOS) at cleaved surfaces of InAs/GaSb isolated quantum wells and double quantum wells (DQWs) by low-temperature scanning tunneling spectroscopy. Distinct standing wave patterns of LDOS corresponding to subbands are observed. These LDOS patterns and subband energies agree remarkably well with simple calculations with tip-induced band bending. Furthermore, for the DQWs, coupling of electronic states between the quantum wells is also clearly observed. |
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