Semimetal to semiconductor transition in ErP islands grown on InP(001) due to quantum-size effects

被引：30

作者：

Bolotov, L ^{[1
]}

Tsuchiya, T

Nakamura, A

Ito, T

Fujiwara, Y

Takeda, Y

机构：

[1] Nagoya Univ, Ctr Integrated Res Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, Dept Crystalline Mat Sci, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[3] Nagoya Univ, Dept Mat Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.59.12236

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thickness-dependent changes in the electronic states of semimetal ErP islands grown on the InP(001) surface by organometallic vapor-phase epitaxy have been investigated by means of scanning tunneling microscopy/spectroscopy. The normalized differential conductance spectra show a semimetal behavior for the ErP islands (20-50 nm in size) with thickness larger than 3.4 nm, while the spectra taken for the islands thinner than 3.4 nm reveal a semiconducting gap varying to similar to 1 eV. The thickness dependence of the observed gap is explained by the energy gap between the electron sublevel and the hole sublevel calculated using a one-dimensional square-well potential model with infinite barriers. The results demonstrate a semimetal to semiconductor transition due to the quantum size effect on the semimetal ErP band structure with a band overlap of -0.3 eV. [S0163-1829(99)01020-6].

引用

页码：12236 / 12239

页数：4

共 43 条

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PHYSICAL REVIEW B, 2002, 65 (24) : 2413011 - 2413014
[42] LOW-DIMENSIONAL SYSTEMS - QUANTUM-SIZE EFFECTS AND ELECTRONIC-PROPERTIES OF SEMICONDUCTOR MICROCRYSTALLITES (ZERO-DIMENSIONAL SYSTEMS) AND SOME QUASI-2-DIMENSIONAL SYSTEMS
YOFFE, AD
ADVANCES IN PHYSICS, 1993, 42 (02) : 173 - 266
[43] Density of InAs/InP(001) quantum dots grown by metal-organic vapor phase epitaxy: Independent effects of InAs and cap-layer growth rates
Michon, A.
Patriarche, G.
Beaudoin, G.
Saint-Girons, G.
Gogneau, N.
Sagnesa, I.
APPLIED PHYSICS LETTERS, 2007, 91 (10)

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