Femtosecond THz Studies of Intra-Excitonic Transitions

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Few-cycle THz pulses are employed to resonantly access the internal fine structure of photogenerated excitons in semiconductors, on the femtosecond time scale. This technique allows us to gain novel insight into many-body effects of excitons and reveal key quantum optical processes. We discuss experiments that monitor the density-dependent re?normalization of the binding energy of a high-density exciton gas in GaAs/AlGaAs quantum wells close to the Mott transition. In a dilute ensemble of 3p excitons in Cu2O, stimulated THz emission from internal transitions to the energetically lower 2s state is observed at a photon energy of 6.6 meV, with a cross ... continued below

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Huber, Rupert; Schmid, Ben A.; Kaindl, Robert A. & Chemla, Daniel S. October 2, 2007.

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Few-cycle THz pulses are employed to resonantly access the internal fine structure of photogenerated excitons in semiconductors, on the femtosecond time scale. This technique allows us to gain novel insight into many-body effects of excitons and reveal key quantum optical processes. We discuss experiments that monitor the density-dependent re?normalization of the binding energy of a high-density exciton gas in GaAs/AlGaAs quantum wells close to the Mott transition. In a dilute ensemble of 3p excitons in Cu2O, stimulated THz emission from internal transitions to the energetically lower 2s state is observed at a photon energy of 6.6 meV, with a cross section of 10-14 cm2. Simultaneous interband excitation of both exciton levels drives quantum beats, which cause efficient THz emission at the difference frequency. By extending this principle to various other exciton resonances, we develop a novel way of mapping the fine structure by two-dimensional THz emission spectroscopy.

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  • Journal Name: Physica Status Solidi (b); Journal Volume: 245; Journal Issue: 6; Related Information: Journal Publication Date: 4/9/2008

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  • Report No.: LBNL-598E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 951100
  • Archival Resource Key: ark:/67531/metadc926139

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  • October 2, 2007

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  • Nov. 13, 2016, 7:26 p.m.

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  • Oct. 2, 2017, 12:40 p.m.

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Huber, Rupert; Schmid, Ben A.; Kaindl, Robert A. & Chemla, Daniel S. Femtosecond THz Studies of Intra-Excitonic Transitions, article, October 2, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc926139/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.