Indirect excitons in a potential energy landscape created by a perforated electrode

Abstract

We report on the principle and realization of an excitonic device: a ramp that directs the transport of indirect excitons down a potential energy gradient created by a perforated electrode at a constant voltage. The device provides an experimental proof of principle for controlling exciton transport with electrode density gradients. We observed that the exciton transport distance along the ramp increases with increasing exciton density. This effect is explained in terms of disorder screening by repulsive exciton-exciton interactions. V

Spatially resolved and time-resolved imaging of transport of indirect excitons in high magnetic fields

“…Several transport phenomena have been observed in systems of IXs, including the inner ring in the IX emission pattern [5,8,9,12,[14][15][16], laser-induced IX trapping [17][18][19][20], IX localization-delocalization transitions in random [5,8,9], periodic [21,22], and moving [23,24] potentials, IX spin transport [25,26], and coherent IX transport with suppressed scattering [27,28]. Long-range IX transport has also enabled the realization of several excitonic devices including excitonic ramps [1,7,29,30], conveyers [10,13,23,24], and transistors [31][32][33][34][35].…”

“…Long-range IX transport has also enabled the realization of several excitonic devices including excitonic ramps [1,7,29,30], conveyers [10,13,23,24], and transistors [31][32][33][34][35].…”

High-mobility indirect excitons in wide single quantum well

“…This allows creating tailored inplane potential landscapes for IXs E(x, y) = −edF z (x, y) and controlling them in situ by voltage V g (x, y). A variety of electrostatic potential landscapes, including traps [29][30][31][32][33][34][35][36][37], static [22,23,38,39] and moving [24] lattices, ramps [10,14,40], narrow channels [41,42], and split gate devices [43], was created for studying basic exciton properties.…”

Dipolar polaritons in microcavity-embedded coupled quantum wells in electric and magnetic fields

“…The blue shift provides a probe of the exciton density and was used to study exciton phase transitions [13,14]. The static dipole moment also facilitates electrostatic [15][16][17][18] and optical [19,20] control of exciton transport and was exploited for the development of excitonic devices [21].…”