Spatial imaging of two-dimensional electronic states in semiconductor quantum wells

Kyoichi Suzuki, K Kanisawa, Camille Janer, Simon Perraud, Kei Takashina, Toshimasa Fujisawa, Yoshiro Hirayama

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34 Citations (Scopus)

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.
Original languageEnglish
Article number136802
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number13
DOIs
Publication statusPublished - 28 Mar 2007

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