Direct observation of above-quantum-step quasibound states in GaAs/AlxGa1-x/vacuum heterostructures

被引：28

作者：

Lu, W

Mu, YM

Liu, XQ

Chen, XS

Wan, MF

Shi, GL

Qiao, YM

Shen, SC

Fu, Y

Willander, M

机构：

[1] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

[2] Chalmers Univ Technol, S-41296 Gothenburg, Sweden

[3] Univ Goteborg, Dept Phys, S-41296 Gothenburg, Sweden

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.57.9787

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper we demonstrate the existence of above-quantum-step quasibound states in GaAs/Al0.24Ga0.76As/vacuum double heterostructures using a modulated photoreflection spectroscopy technique at room temperature. A series of clearly resolved structures was found in the spectra. Their energy positions agree well with those of transitions between quasibound states in the state density of the heteorostructure. Further envelope wave-function analysis indicates that these quasibound states mainly center in the GaAs/Al0.24Ga0.76As quantum-step region, and are found to be affected by the limited length of electron coherence. [S0163-1829(98)08215-0].

引用

收藏

页码：9787 / 9791

页数：5

相关论文

共 13 条

[1] ABOVE-BARRIER RESONANT TRANSITIONS IN ALXGA1-XAS/ALAS/GAAS HETEROSTRUCTURES [J].

COLOCCI, M ;

MARTINEZPASTOR, J ;

GURIOLI, M .

PHYSICAL REVIEW B, 1993, 48 (11) :8089-8094

[2] OBSERVATION OF ABOVE-BARRIER QUASI-BOUND STATES IN ASYMMETRIC SINGLE QUANTUM-WELLS BY PIEZOMODULATED REFLECTIVITY [J].

DOSSA, D ;

VOON, LCLY ;

RAMMOHAN, LR ;

PARKS, C ;

ALONSO, RG ;

RAMDAS, AK ;

MELLOCH, MR .

APPLIED PHYSICS LETTERS, 1991, 59 (21) :2706-2708

[3] Direct observation of above-barrier quasibound states in InxGa1-xAs/AlAs/GaAs quantum wells [J].

Lee, CD ;

Son, JS ;

Leem, JY ;

Noh, SK ;

Lee, KS ;

Lee, C ;

Hwang, IS ;

Park, HY .

PHYSICAL REVIEW B, 1996, 54 (03) :1541-1544

[4] OBSERVATION OF QUASI-BOUND STATES IN SEMICONDUCTOR SINGLE QUANTUM BARRIERS [J].

LUO, H ;

DAI, N ;

ZHANG, FC ;

SAMARTH, N ;

DOBROWOLSKA, M ;

FURDYNA, JK ;

PARKS, C ;

RAMDAS, AK .

PHYSICAL REVIEW LETTERS, 1993, 70 (09) :1307-1310

[5] MODULATED REFLECTIVITY SPECTROSCOPY OF ELECTRONIC STATES CONFINED IN SURFACE QUANTUM-WELLS AND ABOVE QUANTUM BARRIERS [J].

PARKS, C ;

RAMDAS, AK ;

MELLOCH, MR ;

STEBLOVSKY, G ;

RAMMOHAN, LR ;

LUO, H .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1995, 13 (02) :657-659

[6] PIEZOMODULATED REFLECTIVITY OF ASYMMETRIC AND SYMMETRICAL ALX1GA1-X1AS/GAAS/ALX3GA1-X3AS SINGLE QUANTUM-WELLS [J].

PARKS, C ;

ALONSO, RG ;

RAMDAS, AK ;

RAMMOHAN, LR ;

DOSSA, D ;

MELLOCH, MR .

PHYSICAL REVIEW B, 1992, 45 (24) :14215-14224

[7] OPTICAL-PROPERTIES OF QUANTUM STEPS [J].

SHEN, H ;

POLLAK, FH ;

TSU, R .

APPLIED PHYSICS LETTERS, 1990, 57 (01) :13-15

[8] QUANTUM-WELLS WITH LOCALIZED STATES AT ENERGIES ABOVE THE BARRIER HEIGHT - A FABRY-PEROT ELECTRON FILTER [J].

SIRTORI, C ;

CAPASSO, F ;

FAIST, J ;

SIVCO, DL ;

CHU, SNG ;

CHO, AY .

APPLIED PHYSICS LETTERS, 1992, 61 (08) :898-900

[9] BARRIER-WIDTH DEPENDENCE OF OPTICAL-TRANSITIONS INVOLVING UNCONFINED ENERGY-STATES IN GAAS-ALXGA1-XAS SUPERLATTICES [J].

SONG, JJ ;

YOON, YS ;

FEDOTOWSKY, A ;

KIM, YB ;

SCHULMAN, JN ;

TU, CW ;

HUANG, D ;

MORKOC, H .

PHYSICAL REVIEW B, 1986, 34 (12) :8958-8962

[10] ABOVE BARRIER DOUBLETS IN GAAS/ALXGA1-XAS SUPERLATTICES [J].

SONG, JJ ;

YOON, YS ;

JUNG, PS ;

FEDOTOWSKY, A ;

SCHULMAN, JN ;

TU, CW ;

BROWN, JM ;

HUANG, D ;

MORKOC, H .

APPLIED PHYSICS LETTERS, 1987, 50 (18) :1269-1271