High-spatial-resolution near-field photoluminescence and imaging of whispering-gallery modes in semiconductor microdisks with embedded quantum dots

2008 ◽  
Vol 77 (19) ◽  
Author(s):  
A. M. Mintairov ◽  
Y. Chu ◽  
Y. He ◽  
S. Blokhin ◽  
A. Nadtochy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Near Field ◽  
Whispering Gallery Modes ◽  
Whispering Gallery

Lateral Coupling of Self-Assembled Quantum Dots Studied by Near-Field Spectroscopy

1999 ◽  
Vol 571 ◽  
Author(s):  
H.D. Robinson ◽  
B.B. Goldberg ◽  
J.L. Merz
Keyword(s):  
Quantum Dots ◽  
Additional Data ◽  
High Spatial Resolution ◽  
Large Fraction ◽  
Near Field ◽  
Localized States ◽  
Emission Lines ◽  
Lateral Coupling ◽  
Self Assembled ◽  
Density Regime

ABSTRACTLateral coupling between separate quantum dots has been observed in a system of In0.55A10.45As self-assembled quantum dots. The experiment was performed by taking photoluminescence excitation (PLE) spectra in the optical near-field at 4.2 K. The high spatial resolution afforded by the near-field technique allows us to resolve individual dots in a density regime where interactions between neighboring dots become apparent. In the PLE spectra, narrow resonances are observed in the emission lines of individual dots. A large fraction of these resonances occur simultaneously in several emission lines, originating from different quantum dots. This is evidence of interdot scattering of carriers, which additional data show to be mediated by localized states at energies below the wetting layer exciton energy. A very rich phonon spectrum generated by the complicated interfaces between barrier and dot material is also evident in the data.

Wigner Localization and Whispering Gallery Modes of Electrons in Quantum Dots

2018 ◽  
Vol 52 (4) ◽  
pp. 502-506 ◽  
Author(s):  
A. M. Mintairov ◽  
J. L. Merz ◽  
J. Kapaldo ◽  
A. S. Vlasov ◽  
S. A. Blundell
Keyword(s):  
Quantum Dots ◽  
Whispering Gallery Modes ◽  
Whispering Gallery

scholarly journals Coexistence of electron whispering-gallery modes and atomic collapse states in graphene/WSe2 heterostructure quantum dots

2021 ◽  
Author(s):  
Qi Zheng ◽  
Yu-Chen Zhuang ◽  
Qingfeng Sun ◽  
Lin He
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Whispering Gallery Modes ◽  
Fermi Velocity ◽  
Dirac Fermions ◽  
Heavy Nuclei ◽  
Whispering Gallery ◽  
Klein Tunneling ◽  
Collapse State ◽  
A Charge

Abstract The relativistic massless charge carriers with a Fermi velocity of about c/300 in graphene enable us to realize two distinct types of resonances (c, the speed of light in vacuum). One is electron whispering-gallery mode in graphene quantum dots arising from the Klein tunneling of the massless Dirac fermions. The other is atomic collapse state, which has never been observed in experiment with real atoms due to the difficulty of producing heavy nuclei with charge Z > 170, however, can be realized near a Coulomb impurity in graphene with a charge Z ≥ 1 because of the “small” velocity of the Dirac excitations. Here, unexpectedly, we demonstrate that both the electron whispering-gallery modes and atomic collapse states coexist in graphene/WSe2 heterostructure quantum dots due to the Coulomb-like potential near their edges. By applying a perpendicular magnetic field, evolution from the atomic collapse states to unusual Landau levels in the collapse regime are explored for the first time.

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