@article{
 title = {Spectroscopic determination of the doping and mobility of terahertz quantum cascade structures},
 type = {article},
 year = {2009},
 identifiers = {[object Object]},
 pages = {093104},
 volume = {106},
 websites = {http://link.aip.org/link/JAPIAU/v106/i9/p093104/s1&Agg=doi},
 id = {803dec72-484f-347d-ab39-b0d28a44ed71},
 created = {2013-06-24T23:51:34.000Z},
 file_attached = {false},
 profile_id = {98b0cdba-941b-3355-a7a4-7c4a8e8789cd},
 last_modified = {2017-03-09T21:41:09.791Z},
 read = {false},
 starred = {false},
 authored = {true},
 confirmed = {true},
 hidden = {false},
 citation_key = {Lloyd-Hughes2009a},
 private_publication = {false},
 abstract = {Erahertz time-domain spectroscopy is shown to provide a convenient and rapid means to measure the conductivity of individual layers in semiconductor heterostructures such as terahertz quantum cascade lasers. By modeling the complex transmission at terahertz frequencies, the electron density and the in-plane momentum scattering time of the active regions and doped contact layers were determined for both GaAs/AlGaAs and InGaAs/InAlAs epilayers. The measured temperature dependence of the electron scattering rate revealed the significance of impurity and LO phonon scattering. The implications for laser operation at room temperature are discussed by considering the changes in absorption and resonant tunneling current with temperature.},
 bibtype = {article},
 author = {Lloyd-Hughes, J and Delley, Y L and Scalari, G and Fischer, M and Liverini, V and Beck, M and Faist, J},
 journal = {Journal of Applied Physics},
 number = {9}
}

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