Simultaneous effects of electric field, shallow donor impurity and geometric shape on the electronic states in ellipsoidal ZnS/CdSe core-shell quantum dots

被引：19

作者：

Cristea, M. ^{[1
]}

机构：

[1] Univ Politehn Bucuresti, Dept Phys, 313 Splaiul Independentei, RO-060042 Bucharest, Romania

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2018年 / 103卷

关键词：

Prolate/oblate ellipsoidal core-shell structures; Electric field; Shallow donor impurity; Energy levels; Polarizability; OPTICAL-PROPERTIES; LIGHT-ABSORPTION; BINDING-ENERGY; NANOCRYSTALS; MOBILITY;

D O I：

10.1016/j.physe.2018.06.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Within the effective mass approximation the Schrodinger equation is solved by the finite element method for ellipsoidal ZnS/CdSe core-shell quantum dot. The effects induced by the external electric field, by the impurity position and by the geometric shape on the electronic properties of prolate and oblate spheroids core-shell systems are analyzed. The binding energies, the electron shell localization probabilities and the additional polarizability introduced by the shallow donor impurity are obtained and are investigated for various shapes of spheroid core/shell quantum dots.

引用

页码：300 / 306

页数：7

共 35 条

[1]

Adachi S, 2005, WILEY SER MATER ELEC, P1, DOI 10.1002/0470090340

[2] Binding energy of impurity in a size-quantized coated semiconductor wire: role of the dielectric-constant mismatch [J].

Aghasyan, MM ;

Kirakosyan, AA .

PHYSICA E, 2000, 8 (03) :281-289

[3] A detailed investigation of electronic and optical properties of the exciton, the biexciton and charged excitons in a multi-shell quantum dot nanocrystal [J].

Akturk, Abdurrahman ;

Sahin, Mehmet ;

Koc, Fatih ;

Erdinc, Ahmet .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2014, 47 (28)

[4] Prolate spheroidal quantum dot: Electronic states, direct interband light absorption and electron dipole moment [J].

Baghdasaryan, D. A. ;

Hayrapetyan, D. B. ;

Kazaryan, E. M. .

PHYSICA B-CONDENSED MATTER, 2015, 479 :85-89

[5] Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes [J].

Balet, LP ;

Ivanov, SA ;

Piryatinski, A ;

Achermann, M ;

Klimov, VI .

NANO LETTERS, 2004, 4 (08) :1485-1488

[6] Electronic structure of PbSe/PbS core-shell quantum dots [J].

Bartnik, A. C. ;

Wise, F. W. ;

Kigel, A. ;

Lifshitz, E. .

PHYSICAL REVIEW B, 2007, 75 (24)

[7] Binding Energy of Donor States in a Quantum Dot with Parabolic Confinement [J].

Baskoutas, S. ;

Terzis, A. F. ;

Voutsinas, E. .

JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, 2004, 1 (03) :317-321

[8] Quantum information and computation [J].

Bennett, CH ;

DiVincenzo, DP .

NATURE, 2000, 404 (6775) :247-255

[9] Electroluminescence from single monolayers of nanocrystals in molecular organic devices [J].

Coe, S ;

Woo, WK ;

Bawendi, M ;

Bulovic, V .

NATURE, 2002, 420 (6917) :800-803

[10] Electric field effect on the third-order nonlinear optical susceptibility in inverted core-shell nanodots with dielectric confinement [J].

Cristea, M. ;

Radu, A. ;

Niculescu, E. C. .

JOURNAL OF LUMINESCENCE, 2013, 143 :592-599

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