Spin coherence and dephasing in GaN

被引：175

作者：

Beschoten, B ^{[1
]}

Johnston-Halperin, E

Young, DK

Poggio, M

Grimaldi, JE

Keller, S

DenBaars, SP

Mishra, UK

Hu, EL

Awschalom, DD

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.63.121202

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Time-resolved Faraday rotation is used to measure electron spin coherence in n-type GaN epilayers. Despite densities of charged threading dislocations of similar to5 x 10(8) cm(-2), this coherence yields spin lifetimes of similar to 20 ns at T=5 K, and persists to room temperature. Spin dephasing is investigated in the vicinity of the metal-insulator transition. The dependence on both magnetic field and temperature is found to be qualitatively similar to previous studies in n-type GaAs, suggesting a common origin for spin relaxation in these systems.

引用

页数：4

共 27 条

[1] ELECTRON-SPIN-RESONANCE STUDIES OF DONORS IN WURTZITE GAN [J].

CARLOS, WE ;

FREITAS, JA ;

KHAN, MA ;

OLSON, DT ;

KUZNIA, JN .

PHYSICAL REVIEW B, 1993, 48 (24) :17878-17884

[2] Emission mechanisms of bulk GaN and InGaN quantum wells prepared by lateral epitaxial overgrowth [J].

Chichibu, SF ;

Marchand, H ;

Minsky, MS ;

Keller, S ;

Fini, PT ;

Ibbetson, JP ;

Fleischer, SB ;

Speck, JS ;

Bowers, JE ;

Hu, E ;

Mishra, UK ;

DenBaars, SP ;

Deguchi, T ;

Soto, T ;

Nakamura, S .

APPLIED PHYSICS LETTERS, 1999, 74 (10) :1460-1462

[3] Terahertz spin precession and coherent transfer of angular momenta in magnetic quantum wells [J].

Crooker, SA ;

Baumberg, JJ ;

Flack, F ;

Samarth, N ;

Awschalom, DD .

PHYSICAL REVIEW LETTERS, 1996, 77 (13) :2814-2817

[4] QUANTUM COMPUTATION [J].

DIVINCENZO, DP .

SCIENCE, 1995, 270 (5234) :255-261

[5]

DYAKANOV MI, 1976, SOV PHYS JETP, V42, P7905

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

ELLIOTT, RJ .

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

[7] 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

[8] Spin coherence in semiconductor quantum dots [J].

Gupta, JA ;

Awschalom, DD ;

Peng, X ;

Alivisatos, AP .

PHYSICAL REVIEW B, 1999, 59 (16) :10421-10424

[9] Scanning capacitance microscopy imaging of threading dislocations in GaN films grown on (0001) sapphire by metalorganic chemical vapor deposition [J].

Hansen, PJ ;

Strausser, YE ;

Erickson, AN ;

Tarsa, EJ ;

Kozodoy, P ;

Brazel, EG ;

Ibbetson, JP ;

Mishra, U ;

Narayanamurti, V ;

DenBaars, SP ;

Speck, JS .

APPLIED PHYSICS LETTERS, 1998, 72 (18) :2247-2249

[10]

Heying B, 1996, APPL PHYS LETT, V68, P643, DOI 10.1063/1.116495

← 1 2 3 →