Open AccessWigner localization and whispering gallery modes of electrons in quantum dots
Author(s) -
A. M. Mintairov,
Joachim Merz,
James Kapaldo,
A. S. Vlasov,
S. A. Blundell
Publication year - 2018
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2018.04.45827.16
Subject(s) - quantum dot , electron , whispering gallery wave , physics , exciton , field electron emission , schottky diode , near field scanning optical microscope , atomic physics , condensed matter physics , molecular physics , scanning electron microscope , diode , optoelectronics , optics , laser , optical microscope , quantum mechanics
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 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.