Gateable suppression of spin relaxation in semiconductors

被引：52

作者：

Sandhu, JS

Heberle, AP

Baumberg, JJ

Cleaver, JRA

机构：

[1] Hitachi Cambridge Lab, Cavendish Lab, Cambridge CB3 0HE, England

[2] Univ Cambridge, Cavendish Lab, Microelect Res Ctr, Cambridge CB3 0HE, England

[3] Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.86.2150

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The decay of spin memory in a 2D electron gas is found to be suppressed close to the metal-insulator transition. By dynamically probing the device using ultrafast spectroscopy, relaxation of optically excited electron spin is directly measured as a function of the carrier density. Motional narrowing favors spin preservation in the maximally scattered but nonlocalized electronic states. This implies that the spin-relaxation rate can be both tuned in situ and specifically engineered in appropriate device geometries.

引用

收藏

页码：2150 / 2153

页数：4

相关论文

共 29 条

[1] EXCITON SPIN DYNAMICS IN GAAS HETEROSTRUCTURES [J].

BARAD, S ;

BARJOSEPH, I .

PHYSICAL REVIEW LETTERS, 1992, 68 (03) :349-352

[2] FEMTOSECOND FARADAY-ROTATION IN SPIN-ENGINEERED HETEROSTRUCTURES [J].

BAUMBERG, JJ ;

AWSCHALOM, DD ;

SAMARTH, N .

JOURNAL OF APPLIED PHYSICS, 1994, 75 (10) :6199-6204

[3] HOLE SPIN RELAXATION IN N-MODULATION DOPED QUANTUM-WELLS [J].

BAYLAC, B ;

AMAND, T ;

MARIE, X ;

DAREYS, B ;

BROUSSEAU, M ;

BACQUET, G ;

THIERRYMIEG, V .

SOLID STATE COMMUNICATIONS, 1995, 93 (01) :57-60

[4]

BIR GL, 1976, ZH EKSP TEOR FIZ, V42, P705

[5] ELECTRON-ELECTRON SPIN-FLIP SCATTERING AND SPIN RELAXATION IN SEMICONDUCTORS-III-V AND SEMICONDUCTORS-II-VI [J].

BOGUSLAWSKI, P .

SOLID STATE COMMUNICATIONS, 1980, 33 (03) :389-391

[6] Optical spin resonance and transverse spin relaxation in magnetic semiconductor quantum wells [J].

Crooker, SA ;

Awschalom, DD ;

Baumberg, JJ ;

Flack, F ;

Samarth, N .

PHYSICAL REVIEW B, 1997, 56 (12) :7574-7588

[7]

DYAKONOV MI, 1971, ZH EKSP TEOR FIZ, V33, P1053

[8] METAL-NON-METAL TRANSITION IN HETEROSTRUCTURES WITH THICK SPACER LAYERS [J].

EFROS, AL .

SOLID STATE COMMUNICATIONS, 1989, 70 (03) :253-256

[9] THEORY OF THE EFFECT OF SPIN-ORBIT COUPLING ON MAGNETIC RESONANCE IN SOME SEMICONDUCTORS [J].

ELLIOTT, RJ .

PHYSICAL REVIEW, 1954, 96 (02) :266-279

[10] Injection and detection of a spin-polarized current in a light-emitting diode [J].

Fiederling, R ;

Keim, M ;

Reuscher, G ;

Ossau, W ;

Schmidt, G ;

Waag, A ;

Molenkamp, LW .

NATURE, 1999, 402 (6763) :787-790