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Proceedings Paper

Ultrafast electronic transport in low dimensional semiconductor nanostructures
Author(s): Hyunyong Choi; Theodore B. Norris; Jérôme Faist; Federico Capasso
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Paper Abstract

Ultrafast time-resolved pump-probe measurements are used to study low energy excitations and dynamics of electronic transport in various semiconductor nanostructures. In quantum cascade lasers, we observe ultrafast gain recovery dynamics due to electronic transport in the structures. In particular, the nature of electronic transport had been addressed by using ultrafast optical techniques. Sub-picosecond resonant tunneling injection from the quantum cascade laser injector ground state into the upper lasing state was found to be incoherent due to strong dephasing in the active subband. We also observed the strong coupling of the electronic transport to the intra-cavity photon density, which we term "photon-driven transport". Note that this invited paper reviews the details of our recent observations (H. Choi et al., Phys. Rev. Lett., 100, 167401, 2008 and H. Choi, et al., Appl. Phys. Lett. 92, 122114 (2008)).

Paper Details

Date Published: 7 February 2009
PDF: 9 pages
Proc. SPIE 7214, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII, 721416 (7 February 2009); doi: 10.1117/12.808529
Show Author Affiliations
Hyunyong Choi, Lawrence Berkeley National Lab., Univ. of California, Berkeley (United States)
Univ. of Michigan, Ann Arbor (United States)
Theodore B. Norris, Univ. of Michigan, Ann Arbor (United States)
Jérôme Faist, ETH Zürich (Switzerland)
Federico Capasso, Harvard Univ. (United States)


Published in SPIE Proceedings Vol. 7214:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII
Kong-Thon Tsen; Jin-Joo Song; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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