GEOMETRICAL-CONFINEMENT EFFECTS ON EXCITONS IN QUANTUM DISKS

被引：48

作者：

SONG, J ^{[1
]}

ULLOA, SE ^{[1
]}

机构：

[1] OHIO UNIV,CONDENSED MATTER & SURFACE SCI PROGRAM,ATHENS,OH 45701

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.52.9015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Excitons confined to hat semiconductor quantum dots with elliptical cross sections are considered as we study geometrical effects on exciton binding energy, electron-hole separation, and the resulting linear optical properties. We use numerical matrix diagonalization techniques with appropriately large and optimized basis sets in an effective-mass Hamiltonian approach. The linear optical susceptibilities of GaAs and InAs dots for several different size ratios are discussed and compared to experimental photoluminescence spectra obtained on GaAs/AlxGa1-xAs and InAs/GaAs quantum dots. For quantum dots of several nm in size, there is a strong blueshift of the luminescence due to geometrical-confinement effects. Also, transition peaks are split and shifted towards higher energy, in comparison with dots with circular cross sections.

引用

页码：9015 / 9022

页数：8

共 25 条

[1]

Abramowitz M.., 1972, HDB MATH FUNCTIONS

[2] EFFECTIVE MASSES OF HOLES AT GAAS-ALGAAS HETEROJUNCTIONS [J].

BROIDO, DA ;

SHAM, LJ .

PHYSICAL REVIEW B, 1985, 31 (02) :888-892

[3] PHOTOLUMINESCENCE FROM A SINGLE GAAS/ALGAAS QUANTUM DOT [J].

BRUNNER, K ;

BOCKELMANN, U ;

ABSTREITER, G ;

WALTHER, M ;

BOHM, G ;

TRANKLE, G ;

WEIMANN, G .

PHYSICAL REVIEW LETTERS, 1992, 69 (22) :3216-3219

[4] SHARP-LINE PHOTOLUMINESCENCE AND 2-PHOTON ABSORPTION OF ZERO-DIMENSIONAL BIEXCITONS IN A GAAS/ALGAAS STRUCTURE [J].

BRUNNER, K ;

ABSTREITER, G ;

BOHM, G ;

TRANKLE, G ;

WEIMANN, G .

PHYSICAL REVIEW LETTERS, 1994, 73 (08) :1138-1141

[5] ZERO-DIMENSIONAL EXCITONS IN SEMICONDUCTOR CLUSTERS [J].

BRUS, L .

IEEE JOURNAL OF QUANTUM ELECTRONICS, 1986, 22 (09) :1909-1914

[6] ELECTRONIC WAVE-FUNCTIONS IN SEMICONDUCTOR CLUSTERS - EXPERIMENT AND THEORY [J].

BRUS, L .

JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (12) :2555-2560

[7] EXCITONS IN QUANTUM BOXES - CORRELATION-EFFECTS AND QUANTUM CONFINEMENT [J].

BRYANT, GW .

PHYSICAL REVIEW B, 1988, 37 (15) :8763-8772

[8] EXCITONS IN QUANTUM BOXES [J].

BRYANT, GW .

SURFACE SCIENCE, 1988, 196 (1-3) :596-599

[9] EXCITONS CONFINED BY SPLIT-GATE POTENTIALS [J].

COCOLETZI, GH ;

ULLOA, SE .

PHYSICAL REVIEW B, 1994, 49 (11) :7573-7576

[10] SELECTIVE EXCITATION OF THE PHOTOLUMINESCENCE AND THE ENERGY-LEVELS OF ULTRASMALL INGAAS/GAAS QUANTUM DOTS [J].

FAFARD, S ;

LEONARD, D ;

MERZ, JL ;

PETROFF, PM .

APPLIED PHYSICS LETTERS, 1994, 65 (11) :1388-1390

← 1 2 3 →