Scalable interconnections for remote indirect exciton systems based on acoustic transport

Abstract

Excitons, quasiparticles consisting of electron-hole pairs bound by the Coulomb interaction, are a potential medium for the processing of photonic information in the solid state. Information processing via excitons requires efficient techniques for the transport and manipulation of these uncharged particles. We have carried out a detailed investigation of the transport of excitons in GaAs quantum wells by surface acoustic waves. Based on these results, we introduce here a concept for the interconnection of multiple remote exciton systems based on the long-range transport of dipolar excitons by a network of configurable interconnects driven by acoustic wave beams. By combining this network with electrostatic gates, we demonstrate an integrated exciton multiplexer capable of interconnecting, gating, and routing exciton systems separated by millimeter distances. The multiplexer provides a scalable platform for the manipulation of exciton fluids with potential applications in information processing.

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

“…IXs also form oriented dipoles and have repulsive interactions that facilitate disorder screening. The long IX lifetimes and ability to screen disorder enable long-range transport of IXs before recombination, with transport distances reaching up to hundreds of micrometers [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

“…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].…”

Measurement of Exciton Correlations Using Electrostatic Lattices

“…Indirect excitons (IXs) in coupled quantum well structures (CQW) 1,2 is a model system for exploring diverse physical phenomena including pattern formation, 3 spontaneous coherence and condensation, 4-8 transport, [9][10][11][12][13][14][15][16][17][18][19][20] spin transport and spin textures, 21 and localizationdelocalization transitions. [22][23][24] The CQW consists of a pair of parallel quantum wells separated by a narrow tunneling barrier and the IX is a bound state of an electron and a hole confined in the opposite quantum wells.…”

Transport of indirect excitons in ZnO quantum wells

“…IXs were realized in wide single quantum wells (WSQW) [1][2][3][4] and in coupled quantum wells (CQW) [5][6][7][8] [2-4, 6, 7]. Their long lifetimes allow IXs to travel over large distances before recombination, providing the opportunity to study exciton transport by optical imaging [9][10][11][12][13][14][15] and explore excitonic circuit devices based on exciton transport, see [16] and references therein.Materials with a high IX binding energy allow extending the operation of the excitonic devices to high temperatures [17][18][19]. Furthermore, such materials can allow the realization of high-temperature coherent states of IXs [19].…”

“…Lifetimes of IXs can exceed lifetimes of regular direct excitons by orders of magnitude [2-4, 6, 7]. Their long lifetimes allow IXs to travel over large distances before recombination, providing the opportunity to study exciton transport by optical imaging [9][10][11][12][13][14][15] and explore excitonic circuit devices based on exciton transport, see [16] and references therein.…”