Suris tetrons: possible spectroscopic evidence for four-particle optical excitations of the 2D electron gas

2013/04/30 by A. V. Koudinov, C. Kehl, A. V. Rodina +3 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.112.147402

published as Phys. Rev. Lett. 112, 147402 (2014) · 12 pages, 3 figures

arxiv created 2014/03/12 · arxiv updated 2014/04/23

Abstract

The excitations of a two-dimensional electron gas in quantum wells with intermediate carrier density (~10¹¹ cm^-2), i.e., between the exciton-trion- and the Fermi-Sea range, are so far poorly understood. We report on an approach to bridge this gap by a magneto-photoluminescence study of modulation-doped (Cd,Mn)Te quantum well structures. Employing their enhanced spin splitting, we analyzed the characteristic magnetic-field behavior of the individual photoluminescence features. Based on these results and earlier findings by other authors, we present a new approach for understanding the optical transitions at intermediate densities in terms of four-particle excitations, the Suris tetrons, which were up to now only predicted theoretically. All characteristic photoluminescence features are attributed to emission from these quasi-particles when attaining different final states.

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