Výsledky vyhledávání - "R. Lövenich"

Exciton dynamics studied via internal THz transitions

Autor: R. Lövenich, Daniel Hägele, M.A. Carnahan, Robert A. Kaindl, Daniel S. Chemla

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

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Linear and nonlinear optics of Sr2CuO2Cl2

Autor: A. B. Schumacher, Robert A. Kaindl, J. S. Dodge, Daniel S. Chemla, Lance L. Miller, R. Lövenich, M.A. Carnahan

Publikováno v: Physica B: Condensed Matter. :909-912

We present evidence from both linear and nonlinear optical spectroscopy for the existence of distinct exciton types at the charge-transfer gap of Sr 2 CuO 2 Cl 2 , which are linked by strong, phonon-mediated coupling. We show how several basic optica

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::daa388c41f94fe8cc73fe2e114321306
https://doi.org/10.1016/s0921-4526(01)01527-7

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Formation and Decay of Coherent Four-Particle Correlations in Semiconductors: A Green's Function Theory

Autor: N. A. Fromer, W. Schäfer, Daniel S. Chemla, R. Lövenich

Publikováno v: physica status solidi (b). 221:195-204

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::21e622735413d07d6a1b41002eb3152a
https://doi.org/10.1002/1521-3951(200009)221:1<195::aid-pssb195>3.0.co

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Correlation effects beyond Hartree-Fock theory and polarization dependence of four-wave mixing in bulk GaAs at high magnetic field

Autor: Daniel S. Chemla, W. Schäfer, Peter Kner, R. Lövenich, N. A. Fromer

Publikováno v: Physical Review B. 62:2516-2521

Combining linear polarization excitation and magnetic-field breaking of chiral symmetry of optical transitions in Group-III-V semiconductors, we use resonant degenerate four-wave mixing to observe effects beyond the time-dependent Hartree-Fock theory

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fee104f20e4199fff95c48a13bba492a
https://doi.org/10.1103/physrevb.62.2516

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Effect of magnetoexciton correlations on the coherent emission of semiconductors

Autor: W. Schäfer, Daniel S. Chemla, S. Bar-Ad, R. Lövenich, Peter Kner, M. V. Marquezini

Publikováno v: Physical Review B. 60:4731-4748

Mean-field, Hartree-Fock theory has been successful in explaining many nonlinear optical experiments in semiconductors. But recently experiments have shown important cases where the mean-field theory (the semiconductor Bloch equations) fails. One suc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7d99d3eccac5575c39356c369928ba39
https://doi.org/10.1103/physrevb.60.4731

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Coherence of Four-Particle Correlations in Semiconductors

Autor: Daniel S. Chemla, R. Lövenich, Peter Kner, W. Schäfer

Publikováno v: Physical Review Letters. 81:5386-5389

We report direct investigations of the coherence of four-particle (exciton-exciton) correlations by ultrafast four-wave mixing experiments. We determine the sensitivity of the coherence of the four-particle correlations to temperature and excitation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85c0882fbe62954d6e84c9e308afd5dd
https://doi.org/10.1103/physrevlett.81.5386

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Magnetically enhanced exciton-exciton correlations in semiconductors

Autor: Peter Kner, Daniel S. Chemla, R. Lövenich, W. Schäfer

Publikováno v: Journal of Luminescence. :104-108

Recent experiments on fs time-resolved coherent wave mixing under a high magnetic field have revealed a new regime at low excitation densities which is not in accordance with the semiconductor Bloch equations. We present a theory of coherently driven

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48927f196cb62988b8b8514dff8adb23
https://doi.org/10.1016/s0022-2313(97)00187-7

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Theory of Coherently Driven Biexcitons in Strong Magnetic Fields

Autor: Peter Kner, R. Lövenich, Daniel S. Chemla, W. Schäfer

Publikováno v: physica status solidi (a). 164:347-351

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39a8ba23c324a7e7c0fa4a899c620015
https://doi.org/10.1002/1521-396x(199711)164:1<347::aid-pssa347>3.0.co

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The resonant interband contribution to the TEOS signal

Autor: G. Bartels, A. Müller, Thomas Dekorsy, Peter Haring-Bolivar, R. Lövenich, A. Stahl, Heinrich Kurz, K. Victor

Publikováno v: Scopus-Elsevier

A strong interband contribution to the signal obtained by resonant transmittance electro-optical sampling (TEOS) is revealed by a theoretical analysis. The theory is based on the semiconductor Bloch equations. It leads to χ(3) contribution to the si

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db25307c05101905386fadad765224de
https://doi.org/10.1016/s0038-1098(96)00562-5

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