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Journal article

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.

    Keywords: disordered systems ; quantum wells ; electronic states (localized) ; EXTENDED STATES ; LOCALIZATION

    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

    Reference

    Record created on 2007-08-31, modified on 2016-08-08

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