Infrared survey of the carrier dynamics in III-V digital ferromagnetic heterostructures

被引：20

作者：

Burch, KS ^{[1
]}

Singley, EJ

Stephens, J

Kawakami, RK

Awschalom, DD

Basov, DN

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Calif Santa Barbara, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA

[3] Calif State Univ Hayward, Dept Phys, Hayward, CA 94542 USA

[4] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.71.125340

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the electromagnetic response of digital ferromagnetic heterostructures (DFH): systems with delta-doped MnAs layers separated by GaAs spacers of variable thickness (y). The gross features of the infrared conductivity of DFH samples are consistent with the notion that these digital structures are GaAs/Ga1-xMnxAs superlattices. This conclusion is supported by a combination of spectral weight analysis and effective medium theory. The optical properties of DFH also provide insights into the evolution of their critical temperature with GaAs spacing. In DFH a low-lying gap materializes in the energy dependent conductivity, which is interpreted as a mobility gap resulting from Anderson localization.

引用

页数：7

共 39 条

[1] Ferromagnetism and its stability in the diluted magnetic semiconductor (In,Mn)As [J].

Akai, H .

PHYSICAL REVIEW LETTERS, 1998, 81 (14) :3002-3005

[2] Single-band model for diluted magnetic semiconductors: Dynamical and transport properties and relevance of clustered states [J].

Alvarez, G ;

Dagotto, E .

PHYSICAL REVIEW B, 2003, 68 (04)

[3] OPTICAL-PROPERTIES OF THIN-FILMS [J].

ASPNES, DE .

THIN SOLID FILMS, 1982, 89 (03) :249-262

[4] OPTICAL-PROPERTIES OF MNAS AND MNAS0.85P0.15 [J].

BARNER, K ;

BRAUNSTEIN, R ;

CHOCK, E .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1977, 80 (02) :451-460

[5]

BERCIU M, CONDMAT0111045

[6] Two-carrier transport in epitaxially grown MnAs [J].

Berry, JJ ;

Potashnik, SJ ;

Chun, SH ;

Ku, KC ;

Schiffer, P ;

Samarth, N .

PHYSICAL REVIEW B, 2001, 64 (05)

[7] Ellipsometric study of the electronic structure of Ga1-xMnxAs and low-temperature GaAs -: art. no. 205208 [J].

Burch, KS ;

Stephens, J ;

Kawakami, RK ;

Awschalom, DD ;

Basov, DN .

PHYSICAL REVIEW B, 2004, 70 (20) :205208-1

[8]

Carr G. L., 1985, Infrared and Millimeter Waves, V13, P171

[9] Transition temperature of ferromagnetic semiconductors: A dynamical mean field study [J].

Chattopadhyay, A ;

Das Sarma, S ;

Millis, AJ .

PHYSICAL REVIEW LETTERS, 2001, 87 (22) :227202-227202

[10] Ab initio description of the diluted magnetic semiconductor Ga1-xMnxAs:: Ferromagnetism, electronic structure, and optical response -: art. no. 233310 [J].

Craco, L ;

Laad, MS ;

Müller-Hartmann, E .

PHYSICAL REVIEW B, 2003, 68 (23)

← 1 2 3 4 →