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.
WOS:000078221000003
1999
109
5
305
310
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
Cited Reference Count: 14
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