COULOMB INTERACTION OF TRIANGULAR QUANTUM DOTS IN A SMALL RING INTERFEROMETER

2003 ◽  
Vol 02 (06) ◽  
pp. 495-503 ◽  
Author(s):  
D. G. BAKSHEYEV ◽  
A. A. BYKOV ◽  
V. A. TKACHENKO ◽  
O. A. TKACHENKO ◽  
L. V. LITVIN ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Coulomb Interaction ◽  
High Resistance ◽  
Single Mode ◽  
Electron System ◽  
Small Ring ◽  
Ring Interferometer ◽  
Realistic Modeling ◽  
Charge Interaction ◽  
Doublet Splitting

Doublet splitting of single-electron peaks has been observed in the conductance of a small high-resistance ring interferometer. Realistic modeling of the device shows that the electron system of interferometer divides into two triangular quantum dots connected by single-mode channels to each other and to reservoirs. We explain the splitting of conductance peaks by charge interaction of the dots.

Excitonic quasimolecules containing of two quantum dots

2016 ◽  
pp. 4024-4028 ◽  
Author(s):  
Sergey I. Pokutnyi ◽  
Wlodzimierz Salejda
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Exchange Interaction ◽  
Coulomb Interaction ◽  
Silicate Glass ◽  
Glass Matrix ◽  
Silicate Glass Matrix

The possibility of occurrence of the excitonic  quasimolecule formed of spatially separated electrons and holes in a nanosystem that consists  of  CuO quantum dots synthesized in a silicate glass matrix. It is shown that the major contribution to the excitonic quasimolecule binding energy is made by the energy of the exchange interaction of electrons with holes and this contribution is much more substantial than the contribution of the energy of Coulomb interaction between the electrons and holes.

scholarly journals Interplay of spin–orbit coupling and Coulomb interaction in ZnO-based electron system

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
D. Maryenko ◽  
M. Kawamura ◽  
A. Ernst ◽  
V. K. Dugaev ◽  
E. Ya. Sherman ◽  
...  
Keyword(s):  
Coulomb Interaction ◽  
High Mobility ◽  
Electron System ◽  
Orbit Coupling ◽  
Electron Interaction ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Strong Electron ◽  
Strongly Coupled ◽  
Dimensional Electron System

AbstractSpin–orbit coupling (SOC) is pivotal for various fundamental spin-dependent phenomena in solids and their technological applications. In semiconductors, these phenomena have been so far studied in relatively weak electron–electron interaction regimes, where the single electron picture holds. However, SOC can profoundly compete against Coulomb interaction, which could lead to the emergence of unconventional electronic phases. Since SOC depends on the electric field in the crystal including contributions of itinerant electrons, electron–electron interactions can modify this coupling. Here we demonstrate the emergence of the SOC effect in a high-mobility two-dimensional electron system in a simple band structure MgZnO/ZnO semiconductor. This electron system also features strong electron–electron interaction effects. By changing the carrier density with Mg-content, we tune the SOC strength and achieve its interplay with electron–electron interaction. These systems pave a way to emergent spintronic phenomena in strong electron correlation regimes and to the formation of quasiparticles with the electron spin strongly coupled to the density.

Towards a single-mode single photon source based on single quantum dots

2001 ◽  
Vol 94-95 ◽  
pp. 797-803 ◽  
Author(s):  
I. Robert ◽  
E. Moreau ◽  
J.M. Gérard ◽  
I. Abram
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Single Mode ◽  
Single Quantum ◽  
Single Photon Source ◽  
Single Quantum Dots ◽  
Photon Source

scholarly journals A computational approach for investigating Coulomb interaction using Wigner–Poisson coupling

2021 ◽  
Author(s):  
Majid Benam ◽  
Mauro Ballicchia ◽  
Josef Weinbub ◽  
Siegfried Selberherr ◽  
Mihail Nedjalkov
Keyword(s):  
Coulomb Interaction ◽  
Spectral Decomposition ◽  
Electron System ◽  
Local Approximation ◽  
Computational Effort ◽  
Computational Approach ◽  
Electron Interaction ◽  
Quantum Particles ◽  
Interacting Electrons ◽  
Poisson Coupling

AbstractEntangled quantum particles, in which operating on one particle instantaneously influences the state of the entangled particle, are attractive options for carrying quantum information at the nanoscale. However, fully-describing entanglement in traditional time-dependent quantum transport simulation approaches requires significant computational effort, bordering on being prohibitive. Considering electrons, one approach to analyzing their entanglement is through modeling the Coulomb interaction via the Wigner formalism. In this work, we reduce the computational complexity of the time evolution of two interacting electrons by resorting to reasonable approximations. In particular, we replace the Wigner potential of the electron–electron interaction by a local electrostatic field, which is introduced through the spectral decomposition of the potential. It is demonstrated that for some particular configurations of an electron–electron system, the introduced approximations are feasible. Purity, identified as the maximal coherence for a quantum state, is also analyzed and its corresponding analysis demonstrates that the entanglement due to the Coulomb interaction is well accounted for by the introduced local approximation.

A single-mode solid-state source of single photons based on isolated quantum dots in a micropillar

2002 ◽  
Vol 13 (2-4) ◽  
pp. 418-422 ◽  
Author(s):  
E Moreau ◽  
I Robert ◽  
L Manin ◽  
V Thierry-Mieg ◽  
J.M Gérard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Single Mode ◽  
Single Photons

QUANTUM PHASE GATING WITH SEMICONDUCTOR QUANTUM DOTS IN A MICROCAVITY

2004 ◽  
Vol 18 (23) ◽  
pp. 1195-1203
Author(s):  
MANG FENG
Keyword(s):  
Quantum Dots ◽  
Degrees Of Freedom ◽  
Cavity Mode ◽  
Nearest Neighbor ◽  
Single Mode ◽  
Laser Pulses ◽  
Semiconductor Quantum Dots ◽  
Quantum Phase ◽  
Conduction Band Electron ◽  
Excitonic States

We propose a scheme to carry out quantum phase gate in one step by bichromatic radiation method with semiconductor quantum dots (QDs) embedded in a single mode microcavity. The spin degrees of freedom of the only excess conduction band electron are employed as qubits and excitonic states are used as auxiliary states. The nearest-neighbor coupling is not required because the cavity mode plays the role of data bus. We show how to perform quantum computing with properly tailored laser pulses and Pauli-blocking effect, without exciting the cavity mode.

Phase drift and temperature-induced ordering of h/e oscillations in a small ring interferometer

JETP Letters ◽  
2013 ◽  
Vol 97 (1) ◽  
pp. 10-14 ◽  
Author(s):  
O. A. Tkachenko ◽  
V. A. Tkachenko ◽  
J. C. Portal
Keyword(s):  
Small Ring ◽  
Phase Drift ◽  
Ring Interferometer
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