Wigner Localization and Whispering Gallery Modes of Electrons in Quantum Dots

Journal Article · Sun Apr 15 00:00:00 EDT 2018 · Semiconductors

DOI:https://doi.org/10.1134/S1063782618040218· OSTI ID:22749997

Merz, J. L.; Kapaldo, J. ^[1]; Vlasov, A. S. ^[2]; Blundell, S. A. ^[3]

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1. University of Notre Dame (United States)
2. Ioffe Institute (Russian Federation)
3. INAC-SyMMES, Université Grenoble Alpes (France)

We used a low temperature near-field scanning optical microscopy (NSOM) to study a formation of Wigner molecules (WMs) in the emission spectra of self-organized InP/GaInP QDs having up to seven electrons. We used a Schottky diode structure for the electrostatic control of the number of the electrons (N) in QD, and we observed the emission of the charged excitons (for N < 3) and of the WMs (for N > 2) in the regime of weak Wigner localization. We show, that a contribution of whispering gallery modes (WGMs) of the electrons and rearrangement of the electrons between the WM and WGM states in the QDs, can explain the anomalous dependence of NSOM image size on the quantum confinement observed for some dots.

• OSTI ID: 22749997
• Journal Information: Semiconductors, Vol. 52, Issue 4; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EMISSION SPECTRA
INDIUM PHOSPHIDES
QUANTUM DOTS
SCANNING LIGHT MICROSCOPY
SCHOTTKY BARRIER DIODES
TEMPERATURE RANGE 0065-0273 K