Nickel HA, Yeo TM, Dzyubenko AB, McCombe BD, Petrou A, Sivachenko AY, Schaff W, Umansky V. Internal transitions of negatively charged magnetoexcitons and many body effects in a two-dimensional electron gas.
PHYSICAL REVIEW LETTERS 2002;
88:056801. [PMID:
11863762 DOI:
10.1103/physrevlett.88.056801]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2000] [Revised: 08/21/2001] [Indexed: 05/23/2023]
Abstract
Internal transitions of quasi-two-dimensional, negatively charged magnetoexcitons ( X-) and their evolution with excess electron density have been studied in GaAs/AlGaAs quantum wells. In the dilute electron limit, due to magnetic translational invariance, the optically detected resonance spectra are dominated by bound-to-continuum bands in contrast to the negatively charged donor system D-, which exhibits strictly bound-to-bound transitions. With increasing excess electron density Landau-level filling factors nu<2 the X--like transitions are blueshifted; they are absent for nu>2. The blueshifted transitions are explained in terms of a new type of collective excitation---magnetoplasmons bound to a mobile valence band hole.
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