Work

Resonantly excited high-density exciton gas studied via broadband THz spectroscopy

Year: 2008

Type: article

Abstract: We report the density-dependent crossover of a resonantly photoexcited exciton gas from insulating to conducting phases.Broadband terahertz spectroscopy gives direct access to the exciton binding energy via intra-excitonic 1s-2p transitions.A strong shift, broadening, and ultimately the disappearance of this resonance occurs with decreasing inter-particle distance.Densities of excitons and unbound electron-hole pairs are followed quantitatively using a model of the composite free-carrier and exciton terahertz conductivity.Comparison with near-infrared absorption changes illustrates a significantly enhanced energy shift and broadening of the intra-excitonic resonance.

Source: eScholarship (California Digital Library)

Authors: Huber, Rupert, Kaindl, Robert A., Schmid, Ben A., Chemla, Daniel S.

Language: English

Topic: Semiconductor Quantum Structures and Devices

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Alexander von Humboldt-Stiftung, Office of Science, Basic Energy Sciences, Sandia National Laboratories

Awards: G1286236842, G1286251239, G1591330662, G30714459, G3083819904, G3689434148, G419881185, G42916606, G4501827968, G498139845, G650090426, G969889393

OpenAlex ID: W2147629370

FWCI: 2.783

Cites: 2

Cited by: 52

Related to: 10