OPTICAL PHONON EFFECT IN AN ASYMMETRIC QUANTUM DOT QUBIT

2012 ◽  
Vol 10 (07) ◽  
pp. 1250077 ◽  
Author(s):  
ZHAO-HUA DING ◽  
YONG SUN ◽  
JING-LIN XIAO
Keyword(s):  
Quantum Dot ◽  
Excited States ◽  
Oscillation Period ◽  
Present System ◽  
Superposition State ◽  
Strongly Coupled ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum ◽  
Electron Phonon Coupling ◽  
Increasing Function

We investigate the eigenenergies and the eigenfunctions of the ground and the first excited states of an electron, which is strongly coupled to LO-phonon in an asymmetric quantum dot (QD) by using variational method of Pekar type. The present system may be used as a two-level qubit. When the electron is in the superposition state of the ground and the first excited states, the probability density of the electron oscillates in the QD with a certain period. It is found that the oscillation period is an increasing function of the transverse and the longitudinal effective confinement lengths of the QD, whereas it is a decreasing one of the electron–phonon coupling strength.

THE EFFECT OF ELECTRIC FIELD ON A QUANTUM ROD QUBIT

2012 ◽  
Vol 26 (11) ◽  
pp. 1250068 ◽  
Author(s):  
JING-LIN XIAO
Keyword(s):  
Electric Field ◽  
Probability Density ◽  
Excited States ◽  
Three Dimensional ◽  
Oscillation Period ◽  
Strongly Coupled ◽  
Electron Phonon Coupling ◽  
Rod System ◽  
Quantum Rod ◽  
Electron Probability Density

The Hamiltonian of a quantum rod with an ellipsoidal boundary is given after a coordinate transformation, which changes the ellipsoidal boundary into a spherical one. We study the electron which is strongly coupled to the LO-phonon eigenenergies and eigenfunctions of the ground and the first-excited states in a quantum rod under an applied electric field by using variational method of Pekar type. This quantum rod system may be used as a two-level qubit. When the electron is in the superposition state of the ground and the first-excited states, we obtain the time evolution of the electron probability density. The probability density of the electron oscillates in the quantum rod with an oscillation period. It is found that due to the presence of the three-dimensional anisotropic harmonic potential in the radius and the length directions of the quantum rod, the electron probability density shows double-peak configuration, whereas there is only peak if the confinement is a two-dimensional symmetric one in the x- and y-directions. The oscillation period is an increasing function of the ellipsoid aspect ratio and the transverse and longitudinal effective confinement lengths of the quantum rod, whereas it is decreasing one of the electron–phonon coupling strength and the electric field.

Asymmetric Quantum-Dot Pixelation for Color-Converted White Balance

ACS Photonics ◽  
2021 ◽  
Author(s):  
Enguo Chen ◽  
Jianyao Lin ◽  
Tao Yang ◽  
Yu Chen ◽  
Xiang Zhang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
White Balance ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum

TRANSITION FREQUENCY OF STRONG-COUPLING IMPURITY BOUND POLARON IN AN ASYMMETRIC QUANTUM DOT

2012 ◽  
Vol 11 (03) ◽  
pp. 1250026 ◽  
Author(s):  
CHENG-SHUN WANG ◽  
YU-FANG CHEN ◽  
JING-JIN XIAO
Keyword(s):  
Excited State ◽  
Coupling Strength ◽  
State Energy ◽  
Transition Frequency ◽  
Phonon Coupling ◽  
Excited State Energy ◽  
Bound Polaron ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum ◽  
Electron Phonon Coupling

Properties of the excited state of strong-coupling impurity bound polaron in an asymmetric quantum dot are studied by using linear combination operator and unitary transformation methods. The first internal excited state energy, the excitation energy and the transition frequency between the first internal excited and the ground states of the impurity bound polaron as functions of the transverse and the longitudinal effective confinement lengths of the dot, the electron–phonon coupling strength and the Coulomb bound potential were derived. Our numerical results show that they will increase with decreasing the effective confinement lengths, due to interesting quantum size confining effects. But they are an increasing functions of the Coulomb bound potential. The first internal excited state energy is a decreasing function of the electron–phonon coupling strength whereas the transition frequency and the excitation energy are an increasing one of the electron–phonon coupling strength.

Excitation transfer in self-organized asymmetric quantum dot pairs

1998 ◽  
Vol 58 (16) ◽  
pp. R10151-R10154 ◽  
Author(s):  
R. Heitz ◽  
I. Mukhametzhanov ◽  
P. Chen ◽  
A. Madhukar
Keyword(s):  
Quantum Dot ◽  
Excitation Transfer ◽  
Self Organized ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum

EFFECTIVE MASS OF STRONG-COUPLED BOUND POLARON IN AN ASYMMETRIC QUANTUM DOT INDUCED WITH RASHBA EFFECT

2011 ◽  
Vol 10 (03) ◽  
pp. 501-505 ◽  
Author(s):  
ZHIXIN LI ◽  
JUAN XIAO ◽  
AIYONG LIU ◽  
JINGLIN XIAO
Keyword(s):  
Quantum Dot ◽  
Effective Mass ◽  
Operator Method ◽  
Transformation Method ◽  
Rashba Effect ◽  
Linear Combination Operator ◽  
Polaron Model ◽  
Bound Polaron ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum

In this paper, on the basis of Huybrechs' strong-coupled polaron model, the Tokuda-modified linear-combination operator method and the unitary transformation method are used to study the properties of the strong-coupled bound polaron considering the influence of Rashba effect, which is brought by the spin-orbit (SO) interaction, in an asymmetric quantum dot (QD). The expression for the effective mass of the polaron as functions of the transverse and longitudinal bound strengths, velocity, vibration frequency, and the bound potential has been derived. After a simple numerical calculation on the RbCl crystal, we found that the total effective mass of the bound polaron is composed of three parts. The interaction between the orbit and the spin with different directions has different effects on the effective mass of the bound polaron.

The effect of hydrogen-like impurity on RbCl asymmetric quantum dot qubit

2015 ◽  
Vol 89 (12) ◽  
pp. 1247-1250 ◽  
Author(s):  
Z.-H. Liang ◽  
B. Qi ◽  
J.-L. Xiao
Keyword(s):  
Quantum Dot ◽  
Asymmetric Quantum Dot ◽  
Asymmetric Quantum
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