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Your search keyword '"Kapaldo, J."' showing total 2 results
Start Over Author "Kapaldo, J." Topic wigner distribution
2 results on '"Kapaldo, J."'

1. Wigner Localization and Whispering Gallery Modes of Electrons in Quantum Dots.

Author

Mintairov, A. M., Merz, J. L., Kapaldo, J., Vlasov, A. S., and Blundell, S. A.

Subjects
NEAR-field microscopy, WIGNER distribution, QUANTUM dots, ELECTRONS, WHISPERING gallery modes
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Near-Field Scanning Magneto-Optical Spectroscopy of Wigner Molecules.

Author

Mintairov, A. M., Kapaldo, J., Merz, J. L., Rouvimov, S., Kalyygniy, N., Mintairov, S. A., Nekrasov, S., Saly, R., Vlasov, A. S., and Blundell, S.

Subjects
*MAGNETOOPTICS, *OPTICAL spectroscopy, *WIGNER distribution, *EMISSION spectroscopy, *INDIUM phosphide, *QUANTUM dots
Abstract

We study the emission spectra of single self-organized InP/GaInP QDs (size 100-220 nm) using high-spatialresolution, low-temperature (5K) near-field scanning optical microscope (NSOM) operating at magnetic field strength B=0-10T. The dots contain up to twenty electrons and represent natural Wigner molecules (WM). We observed vibronic-type shake-up structure in single electron QDs manifesting formation of two electron (2e) WM in photo-excited state. We found that relative intensities of the shake-up components described well by vibronic Frank-Condon factors giving for dots having parabolic confinement energy hω0=1.2-4 meV molecule bond lengths 40-140 nm. We used measurements of magnetic-field-induced shifts to distinguish emission of 2e-WM and singly charged exciton (trion). We also observed magnetic-field-induced molecular-droplet transition for two electron dot, emitting through doubly charge exciton (tetron) at zero magnetic field. [ABSTRACT FROM AUTHOR]

Published
2016
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