Artificially Constructed Plasmarons and Plasmon-Exciton Molecules in 2D Metals

Abstract

Resonant optical excitation was used to create a macroscopic nonequilibrium ensemble of "dark" excitons with an unprecedented long lifetime in a two-dimensional electron system placed in a quantizing magnetic field. Exotic three-particle and four-particle states, plasmarons and plasmon-exciton molecules, coupled with the surrounding electrons through the collective plasma oscillations are engineered. Plasmarons and plasmon-exciton molecules are manifested as new features in the recombination spectra of nonequilibrium systems.

Three-particle electron-hole complexes in two-dimensional electron systems

“…In conclusion, we present the key results of this study. Further studies have been made to determine the properties of three-particle complexes discovered in [ 16 ]. It is experimentally shown that the PL spectrum of the 2D system in the quantum Hall insulator reveals new lines linked to the formation of a nonequilibrium triplet magnetoexciton ensemble.…”

“…In a quantum Hall insulator at ν = 2, a photoexcited hole may occur in magnetoexciton-free space. Such a situation is easily realizable at temperatures above 1.5 K when practically all magnetoexcitons are "ionized" (relaxed to the ground state by the resonant conversion of the magnetoexciton into a magnetoplasmon and recombination of the latter) 16 . In this case, the recombination process involving the photoexcited hole becomes essentially singleparticle recombination.…”

“…Dispersion dependences (top right) of triplet magnetoexciton and magnetoplasmon of the sample in question, calculated in the first order of perturbation theory considering the confining potential profile in the growth direction for the QW (red and black lines). The blue line shows the expected dispersion dependence of the magnetoplasmon accounting for the Coulomb influence of the extra Fermi hole on the plasmaron energy discovered in[ 16 ]. Effect of both excitation power and temperature on the PL spectra in the pump spot (bottom).…”

Local incompressibility of fractional quantum Hall states at a filling factor of 3/2

“…Such a relaxation process is impossible, for instance, at integer filling factor ν = 2, which reflects the incompressibility of the electron gas in the lowest energy spin sublevel of Landau level. This also leads to the formation of charged three-particle complexes (plasmarons and trions) [29,31].…”

Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes

“…Understanding the charge and spin dynamics in condensed matter is essential for the development of novel spintronic devices in which the combination of charge transport with ultrafast spin initialization using optical pulses can be exploited [1][2][3][4][5]. In semiconductors, conduction band electrons which are localized on donor atoms or potential fluctuations, demonstrate long spin relaxation times due to suppression of spin-orbit effects [6].…”