Applications of Ultrafast Terahertz Pulses for Intra-ExcitonicSpectroscopy of Quasi-2D Electron-Hole Gases

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Excitons are of fundamental interest and of importance foropto-electronic applications of bulk and nano-structured semiconductors.This paper discusses the utilization of ultrafast terahertz (THz) pulsesfor the study of characteristic low-energy excitations of photoexcitedquasi 2D electron-hole (e-h) gases. Optical-pump THz-probe spectroscopyat 250-kHz repetition rate is employed to detect characteristic THzsignatures of excitons and unbound e-h pairs in GaAs quantum wells.Exciton and free-carrier densities are extracted from the data using atwo-component model. We report the detailed THz response and pairdensities for different photoexcitation energies resonant to heavy-holeexcitons, light-hole excitons, or the continuum of unbound pairs. Suchexperiments can provide quantitative insights into wavelength, time, ... continued below

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Kaindl, Robert A.; Carnahan, Marc A.; Hagele, Daniel & Chemla, D.S. September 2, 2006.

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Excitons are of fundamental interest and of importance foropto-electronic applications of bulk and nano-structured semiconductors.This paper discusses the utilization of ultrafast terahertz (THz) pulsesfor the study of characteristic low-energy excitations of photoexcitedquasi 2D electron-hole (e-h) gases. Optical-pump THz-probe spectroscopyat 250-kHz repetition rate is employed to detect characteristic THzsignatures of excitons and unbound e-h pairs in GaAs quantum wells.Exciton and free-carrier densities are extracted from the data using atwo-component model. We report the detailed THz response and pairdensities for different photoexcitation energies resonant to heavy-holeexcitons, light-hole excitons, or the continuum of unbound pairs. Suchexperiments can provide quantitative insights into wavelength, time, andtemperature dependence of the low-energy response and composition ofoptically excited e-h gases in low-dimensionalsemiconductors.

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  • Journal Name: Journal of Nanoelectronics and Optoelectronics; Journal Volume: 2; Journal Issue: 1; Related Information: Journal Publication Date: 04/2007

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  • Report No.: LBNL--61752
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 917541
  • Archival Resource Key: ark:/67531/metadc877958

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  • September 2, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Oct. 31, 2016, 3:49 p.m.

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Kaindl, Robert A.; Carnahan, Marc A.; Hagele, Daniel & Chemla, D.S. Applications of Ultrafast Terahertz Pulses for Intra-ExcitonicSpectroscopy of Quasi-2D Electron-Hole Gases, article, September 2, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc877958/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.