Temperature dependence of the properties of strong-coupling bipolaron in a quantum dot

被引：10

作者：

Eerdunchaolu ^{[1
]}

Xin, Wei ^{[1
]}

机构：

[1] Hebei Normal Univ Sci & Technol, Inst Condensed Matter Phys, Qinhuangdao 066004, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2011年 / 406卷 / 03期

关键词：

Quantum dot; Bipolaron; Vibration frequency; Induced potential; Effective potential; Temperature dependence; STABILITY; ELECTRON;

D O I：

10.1016/j.physb.2010.10.063

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Temperature dependence of the properties of strong-coupling bipolaron in a quantum dot (QD) is studied based on the Lee-Low-Pines-Huybrechts variational method and quantum statistical theory. Results of the numerical calculation show that the vibration frequency as well as the absolute value of the induced potential and the effective potential all increase with increasing coupling strength and temperature, respectively, and they also increase with decreasing relative distance of electrons. The bipolarons are closer and more stable when the temperature is higher and coupling strength is larger. The influence of radius of QD and dielectric constant ratio on the effective potential is little. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：358 / 362

页数：5

共 14 条

[1] MODIFICATION OF THE ELECTRON-PHONON INTERACTIONS IN GAAS-GAALAS HETEROJUNCTIONS [J].

BRUMMELL, MA ;

NICHOLAS, RJ ;

HOPKINS, MA ;

HARRIS, JJ ;

FOXON, CT .

PHYSICAL REVIEW LETTERS, 1987, 58 (01) :77-80

[2] ELECTRON ELECTRON AND ELECTRON-HOLE INTERACTIONS IN SMALL SEMICONDUCTOR CRYSTALLITES - THE SIZE DEPENDENCE OF THE LOWEST EXCITED ELECTRONIC STATE [J].

BRUS, LE .

JOURNAL OF CHEMICAL PHYSICS, 1984, 80 (09) :4403-4409

[3] Effects of lattice vibration on the properties of the strong-coupling polaron in a quantum well [J].

Eerdunchaolu ;

Xiao, J. L. .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2007, 76 (04)

[4] Magneto-bound polaron in CdSe spherical quantum dots:: strong coupling approach [J].

El Khamkhami, J ;

Feddi, E ;

Assaid, E ;

Dujardin, F ;

Stébe, B ;

El Haouari, M .

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 2005, 25 (04) :366-373

[5] FORMATION, MOTION, AND HIGH-TEMPERATURE SUPERCONDUCTIVITY OF LARGE BIPOLARONS [J].

EMIN, D .

PHYSICAL REVIEW LETTERS, 1989, 62 (13) :1544-1547

[6] Bipolaron in a quasi-0D quantum dot [J].

Fai, L. C. ;

Fomethe, A. ;

Fotue, A. J. ;

Mborong, V. B. ;

Domngang, S. ;

Issofa, N. ;

Tchoffo, M. .

SUPERLATTICES AND MICROSTRUCTURES, 2008, 43 (01) :44-52

[7] Quantum Monte Carlo results for bipolaron stability in quantum dots [J].

Hohenadler, Martin ;

Littlewood, Peter B. .

PHYSICAL REVIEW B, 2007, 76 (15)

[8] INTERNAL EXCITED-STATE OF OPTICAL POLARON [J].

HUYBRECHTS, WJ .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1977, 10 (19) :3761-3768

[9] Magnetopolaron in a weakly elliptical InAs/GaAs quantum dot [J].

Jacak, L ;

Krasnyj, J ;

Jacak, D ;

Machnikowski, P .

PHYSICAL REVIEW B, 2003, 67 (03)

[10] THE MOTION OF SLOW ELECTRONS IN A POLAR CRYSTAL [J].

LEE, TD ;

LOW, FE ;

PINES, D .

PHYSICAL REVIEW, 1953, 90 (02) :297-302

← 1 2 →