Low temperature photocurrent spectra of ordered and disordered superlattices

We present low temperature photocurrent (PC) spectra of ordered and disordered GaAs/AlGaAs superlattices (SLs). The investigated disordered SLs were designed to provide both localized and extended states. Our results show a dramatic difference between the PC of ordered and disordered SLs. In the ordered case, the PC is observed to decrease abruptly on increasing the applied voltage V, as expected. In contrast, the total PC signal in the disordered SLs increases in steps as a function of the electric field. Our measurements indicate a transition from a conduction regime to Stark localization in the ordered case, and from the Anderson localization to a conductive regime in the disordered ones. Numerical results obtained by the transfer matrix method indicate the weak dependence and the red shift with V of the disordered SL miniband as the causes of the observed behavior. (C) 1999 Elsevier Science Ltd. All rights reserved.


Published in:
Solid State Communications, 109, 5, 305-310
Year:
1999
ISSN:
0038-1098
Keywords:
Note:
Stanford Univ, Ginzton Lab, Stanford, CA 94305 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Bari, Dipartimento Fis, I-70126 Bari, Italy. Ist Nazl Fis Mat, Unita Bari, I-70126 Bari, Italy. Ecole Polytech Fed Lausanne, Inst Genie Atom, CH-1015 Lausanne, Switzerland. Ecole Polytech Fed Lausanne, Inst Micro & Optoelect, CH-1015 Lausanne, Switzerland. Tassone, F, Stanford Univ, Ginzton Lab, Stanford, CA 94305 USA.
ISI Document Delivery No.: 160GA
Times Cited: 1
Cited Reference Count: 14
Cited References:
ANDERSON PW, 1958, PHYS REV, V109, P1482
BLEUSE J, 1988, PHYS REV LETT, V60, P220
BOSIO C, 1988, PHYS REV B, V38, P3263
CAPOZZI V, 1996, PHYS REV B, V54, P7643
CAPOZZI V, 1997, J LUMIN, V72, P361
CHOMETTE A, 1986, PHYS REV LETT, V57, P1464
CRISANTI A, 1989, J PHYS-CONDENS MAT, V1, P9509
DENBIGH JS, 1979, J PHYS C SOLID STATE, V12, L107
GUZZI M, 1989, SOLID STATE PHENOM, V10, P22
KOHMOTO M, 1986, PHYS REV B, V34, P5043
LORUSSO GF, 1997, SOLID STATE COMMUN, V103, P15
MOTT NF, 1961, ADV PHYS, V10, P107
YAMAMOTO T, 1990, J APPL PHYS, V68, P5318
ZHANG YH, 1993, PHYS REV B, V48, P12296
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