Zobrazeno 1 - 10
of 335
pro vyhledávání: '"Daniel S. Chemla"'
Publikováno v:
physica status solidi (b). 245:1041-1048
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 reve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cddee7cea83203b073c142cd5bd5fc3b
https://doi.org/10.1002/pssb.200777603
https://doi.org/10.1002/pssb.200777603
Publikováno v:
Journal of Nanoelectronics and Optoelectronics. 2:83-89
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 excit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e037d48493fc65ad4271fe082d04563a
https://doi.org/10.1166/jno.2007.007
https://doi.org/10.1166/jno.2007.007
Publikováno v:
physica status solidi (b). 243:2397-2404
We present a many-body theory of the non-linear optical response of the Quantum Hall system. This theory describes the role of the cold, strongly correlated, two-dimensional electron gas (2DEG) in the ultrafast dynamics. We discuss the manifestations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17768649ccfa9fcd6b71432c9255342a
https://doi.org/10.1002/pssb.200668076
https://doi.org/10.1002/pssb.200668076
Autor:
Jérôme Tignon, Ilias E. Perakis, Daniel S. Chemla, M. Breit, Keshav M. Dani, E.G. Kavousanaki
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 34:206-209
Using the non linear optical technique of 3-pulse 4-wave mixing, we study the dynamics of the collective excitations of the quantum Hall system. We excite the system with 100 fs pulses propagating in directions k 1 and k 3 and then probe its time evo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65403e217204305e07f5fd323989850e
https://doi.org/10.1016/j.physe.2006.03.113
https://doi.org/10.1016/j.physe.2006.03.113
Publikováno v:
International Journal of Modern Physics B. 18:3847-3852
We study the role of many-body correlations in the ultrafast dynamics of quantum well magnetoexcitons. In linear response, inter-Landau level transitions are suppressed if magnetic field is stronger than magnetoexciton binding energy. However, in non
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcb02f485a3f22311b6f52f56da43385
https://doi.org/10.1142/s021797920402758x
https://doi.org/10.1142/s021797920402758x
Publikováno v:
Science. 303:503-506
Degenerate exciton systems have been produced in quasi–two-dimensional confined areas in semiconductor coupled quantum well structures. We observed contractions of clouds containing tens of thousands of excitons within areas as small as (10 μm) 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79c4d8b16f8c96bdd9fb64836584f160
https://doi.org/10.1126/science.1092691
https://doi.org/10.1126/science.1092691
Publikováno v:
Kaindl, R.A.; Hagele, D.; Carnahan, M.A.; Lovenich, R.; & Chemla, D.S.(2003). Exciton dynamics studied via internal THz transitions. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/6nm6761r
We employ a novel, ultrafast terahertz probe to investigate the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs quantum wells. Resonant creation of heavy-hole excitons induces a new low-energy oscillator link
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::efe829b4b4b006f62855b886abbee771
https://doi.org/10.1002/pssb.200303161
https://doi.org/10.1002/pssb.200303161
Autor:
Ilias E. Perakis, Daniel S. Chemla
Publikováno v:
Solid State Communications. 127:147-154
We review recent investigations of the femtosecond non-linear optical response of the two-dimensional electron gas (2DEG) in the quantum Hall effect regime. We find that the time and frequency profile of the four-wave-mixing non-linear optical spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8447dd0f5ea0fed24d187c63cfa23474
https://doi.org/10.1016/s0038-1098(03)00342-9
https://doi.org/10.1016/s0038-1098(03)00342-9
Autor:
Ilias E. Perakis, Daniel S. Chemla
Publikováno v:
physica status solidi (b). 234:242-253
Using time resolved four-wave-mixing (FWM) spectroscopy and many-body theory we investigate the role of non-instantaneous collective and correlation effects in the dynamics of the cold two dimensional electron gas (2DEG) in large magnetic fields. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2629e4bec6d89e60642859d2fc8197fb
https://doi.org/10.1002/1521-3951(200211)234:1<242::aid-pssb242>3.0.co
https://doi.org/10.1002/1521-3951(200211)234:1<242::aid-pssb242>3.0.co
Publikováno v:
Nature. 417:47-52
An exciton is an electron-hole bound pair in a semiconductor. In the low-density limit, it is a composite Bose quasi-particle, akin to the hydrogen atom. Just as in dilute atomic gases, reducing the temperature or increasing the exciton density incre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f12ee8c9ef106e3622bc02bcc627c605
https://doi.org/10.1038/417047a
https://doi.org/10.1038/417047a