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Persistent Currents in the Double Aharonov-Bohm Ring Connected to Electron Reservoirs

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Communications in Theoretical Physics 2007年第3期47卷 573-576页

作者： ZHANG Ying xiao jing-lin Department of Mathematics and Physics Hebei Normal University of Science and Technology Qinhuangdao 066004 China College of Physics and Electromechanics Inner Mongolia National University Tongliao 028043 China

We study persistent currents in the double Aharonov-Bohm ring connected to two electron reservoirs by quantum waveguide theory. It is found that the persistent currents in the double Aharonov-Bohm ring depend .on the direction of the current flow from one reservoir to another. When the direction of the current flow reverses, tl2e persistent current in each ring of the double Aharonov-Bohm ring changes. If the two rings are of the same size, the persistent currents in the left and the right rings exchange at the reversal of the current flow direction.

关键词： quantum waveguide theory mesoscopic structure persistent currents

Properties of Unsymmetrical Parabolic Confinement Potential Quantum Dot Qubit

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Communications in Theoretical Physics 2008年第12期50卷 1287-1289页

作者： CHEN Shi-Hua xiao jing-lin College of Sciences Huzhou Vocational Technology College Huzhou 313000 China Department of Physics Inner Mongolia University for Nationalities Tongliao 028043 China

On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potential quantum dot （QD）, we obtain the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state, and the first-excited state by using variational method of Pekar type. This system in QD may be employed as a two-level quantum system-qubit. When the electron is in the superposition state of the ground state and the first-excited state, we obtain the time evolution of the electron density. The relations both the probability density of electron and the period of oscillation with the electron-LO-phonon coupling strength, the confinement strengths in the xy-plane and the z-direction are discussed.

关键词： quantum dot qubit binding energy

Effective Mass of Strong-Coupling Bound Polaron in a Triangular Quantum Well Induced by Rashba Effect

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Communications in Theoretical Physics 2008年第10期50卷 995-998页

作者： ZHANG Hai-Rui xiao jing-lin Department of Mathematics and Physics Hebei Normal University of Science and Technology Qinhuangdao 066004 China College of Physics and Electronic Information Inner Mongolia National University Tongliao 028043 China

In this paper, on the basis of Huybrechts＇ strong-coupling polaron model, the Tokuda modified linearcombination operator method and the unitary transformation method are used to study the properties of the strongcoupling bound polaron considering the influence of Rashba effect, which is brought by the spin-orbit （SO） interaction, in the semiconductor triangular quantum well （TQW）. Numerical calculation on the RbCI TQW, as the example, is performed. The expressions for the effective mass of the polaron as a function of the vibration frequency, the velocity, the Coulomb bound potential and the electron areal density are derived. Numerical results show that the total effective mass of the polaron is composed of three parts. The interactions between the orbit and the spin with different directions have different effects on the effective mass of the bound polaron.

关键词： triangular quantum well spintronics effective mass Rashba SO interaction

Temperature Effects of Parabolic linear Bound Potential and Coulomb Bound Potential Quantum Dot Qubit

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Communications in Theoretical Physics 2009年第10期52卷 601-605页

作者： CHEN Ying-Jie xiao jing-lin College of Physics and Engineering Qufu Normal University Qufu 273165 China Department of Physics and Electromechanics Inner Mongolia National University Tongliao 028043 China

On the condition of electric-LO phonon strong coupling in a parabolic quantum dot,we obtain theeigenenergy and the eigenfunctions of the ground state and the first-excited state using the variational method ofPekar *** system in a quantum dot may be employed as a two-level quantum *** the electronis in the superposition state of the ground state and the first-excited state,we obtain the time evolution of the *** relations of the probability density of electron on the temperature and the electron-LO-phonon couplingconstant and the relations of the period of oscillation on the temperature,the electron-LO-phonon coupling constant,the Coulomb binding parameter and the confinement length are *** results show that the probability densityof electron oscillates with a period when the electron is in the superposition state of the ground and the first-excitedstate,and show that there are different laws that the probability density of electron and the period of oscillation changewith the temperature and the electron-LO-phonon coupling constant when the temperature is lower or *** is obtained that the period of oscillation decreases with increasing the Coulomb bound potential and increases withincreasing the confinement length not only at lower temperatures but also at higher temperatures.

关键词： quantum dot qubit Coulomb potential temperature effect

Effects of Electric and Magnetic Fields on Pure Dephasing of Exciton Qubits

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Communications in Theoretical Physics 2009年第3期51卷 540-544页

作者： LIU Yun-Fei xiao jing-lin Department of Mathematics and Physics Hebei Normal University of Science and Technology Qinhuangdao 066004 China College of Physics and Electronic Information Inner Mongolia National University Tongliao 028043 China

In a two-dimensional quantum dot （QD） with parabolic confinement potential, we investigate pure dephasing due to deformation potential exciton-bulk longitudinal acoustic phonons （LAP） interaction for exciton qubits under the influence of external static electric and magnetic fields by adopting the full quantum-mechanical method of Kunihiro Kojima and Akihisa Tomita. The wave function is found and the dependence of the pure dephasing factor on the confinement length of the QD and time and temperature is discussed. We find the external electric and magnetic fields have important effects on pure dephasing of exciton qubits because exciton-LAP interaction increases, leading to more pure dephasing.

关键词： quantum dot exciton qubit

Influences of spin on the properties of a weak-coupled magnetopolaron in quantum dot

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Optoelectronics Letters 2008年第4期4卷 307-310页

作者： LI Zhi-xin xiao jing-lin Department of Mathematics and Physics Hebei Normal University of Science ＆ Technology Qinhuangdao 066004 China

Considering the influences of the spin on the ground state energy,the properties of a weak-coupled magnetopolaron in quantum dots are studied by using a linear combination operator and unitary transformation *** numer... 详细信息

关键词：晶体量子点弱耦合磁极化子旋转基态能量

Glu R2-3Y Inhibits the Acquisition and Reinstatement of Morphine-Induced Conditioned Place Preference in Rats

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Neuroscience Bulletin 2016年第2期32卷 177-182页

作者： xiao-jing lin Jian-Jun Zhang Long-Chuan Yu Laboratory of Neurobiology and the National Laboratory of Biomembrane and Membrane Biotechnology College of Life Sciences Peking University Beijing 100871 China Key Laboratory of Mental Health Institute of PsychologyChinese Academy of Sciences Beijing 100101 China National Institute of Biological Sciences Beijing 102206China

Accumulating evidence indicates that a-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors（AMPARs） are involved in the relapse to abused ***, the role of AMPARs containing the Glu R2 subunit in opiate addiction is still unclear. Glu R2-3Y,an interfering peptide, prevents the endocytosis of AMPARs containing the Glu R2 subunit. In this study, we explored the effect of intravenous injection of Glu R2-3Y on the acquisition, expression, and reinstatement of morphine-induced conditioned place preference（m CPP） in rats. We found that infusion of Glu R2-3Y（1.5 nmol/g） one hour before morphine during the conditioning phase inhibited the acquisition of m CPP, while an identical injection one hour before the post-conditioning test had no influence on the expression of m CPP. Injection of Glu R2-3Y（1.5 nmol/g） after m CPP extinction blocked the morphine-induced reinstatement of m CPP. Our results strongly support the hypothesis that inhibition of AMPAR endocytosis provides a new target for the treatment of opiate addiction.

关键词： Glu R2-3Y AMPA receptors Morphine Conditioned place preference Acquisition of mCPP Reinstatement of mCPP

Properties of a Bound Polaron under a Perpendicular Magnetic Field

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Communications in Theoretical Physics 2007年第5X期48卷 930-934页

作者： LIU Jia xiao jing-lin HUO Shu-Fen CHEN Zi-Yui Department of Physics Beijing University of Aeronautics and Astronautics Beijing 100083 China College of Physics and Electromechanics Inner Mongolia University for Nationalities Tongliao 028043 China

We investigate the influence of a perpendicular magnetic field on a bound polaron near the interface of a polar-polar semiconductor with Rashba effect. The external magnetic field strongly changes the ground state binding energy of the polaron and the Rashba spin-orbit （SO） interaction originating from the inversion asymmetry in the heterostructure splits the ground state binding energy of the bound polaron. In this paper, we have shown how the ground state binding energy will be with the change of the external magnetic field, the location of a single impurity, the wave vector of the electron and the electron areal density, taking into account the SO coupling. Due to the presence of the phonons, whose energy gives negative contribution to the polaron＇s, the spin-splitting states of the bound polaron are more stable, and we find that in the condition of week magnetic field, the Zeeaman effect can be neglected.

关键词： asymmetric heterostructures spintronics Rashba spin-orbit interaction

Properties of Parabolic linear Bound Potential and Coulomb Bound Potential Quantum Dot Qubit

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Communications in Theoretical Physics 2008年第2期49卷 311-314页

作者： WANG Zi-Wu LI Wei-Ping YIN Ji-Wen xiao jing-lin Department of Physics and Electron Information Engineering Inner Mongolia Chifeng College Chifeng 024000 China Department of Physics and Electromechanics Inner Mongolia Nationality University Tongliao 028043 China

On the condition of electric-LO phonon strong-coupling in a parabolic quantum dot, we obtain the eigenenergy of the ground-state and the first-excited state, the eigenfunctions of the ground-state and the first-excited state by using variational method of Pekar type. This system in quantum dot may be employed as a two-level quantum system-qubit. When the electron is in the superposition state of the ground- and the first-excited state, we obtain the time evolution of the electron density. The relation of the probability density of electron on the Coulomb binding parameter and the relations of the period of oscillation on the Coulomb binding parameter, the electron-LO-phonon coupling constant and the confinement length are derived.

关键词： quantum dot quantum information qubit decoherece