Evidence for Intervalence Band Coherences in Semiconductor Quantum Wells via Coherently Coupled Optical Stark Shifts

Donovan, M.; Schülzgen, Axel; Lee, J.; Blanche, Pierre Alexandre; Peyghambarian, N.; Khitrova, G.; Gibbs, H. M.; Rumyantsev, I.; Kwong, N. H.; Takayama, R.; Yang, Zhenshan; Binder, R.

doi:10.1103/physrevlett.87.237402

Cited by 53 publications

(21 citation statements)

References 14 publications

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“…Based on the magnetic substates for the valence and conduction bands, no coupling between hh and lh excitons would be expected for cocircular excitation. Previous TFWM (39), SRDT (40), and coherent excitation spectroscopy (38) studies have shown that indeed coupling does occur for cocircular excitation pulses, attributing it to many-body correlations. Experimental real rephasing and nonrephasing 2DFTS for cocircular excitation are shown in Fig.…”

Section: Cocircular-polarized Excitation and Dominance Of Many-body Cmentioning

confidence: 99%

Polarization-dependent optical 2D Fourier transform spectroscopy of semiconductors

Zhang

Кузнецова

Meier

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

116

113

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Optical 2D Fourier transform spectroscopy (2DFTS) provides insight into the many-body interactions in direct gap semiconductors by separating the contributions to the coherent nonlinear optical response. We demonstrate these features of optical 2DFTS by studying the heavy-hole and light-hole excitonic resonances in a gallium arsenide quantum well at low temperature. Varying the polarization of the incident beams exploits selection rules to achieve further separation. Calculations using a full many-body theory agree well with experimental results and unambiguously demonstrate the dominance of many-body physics.excitons ͉ many-body effects ͉ ultrafast O ptical excitation of a direct gap semiconductor, such as gallium arsenide (GaAs), produces electron-hole pairs. The Coulomb attraction between the electron and hole can result in a bound state, known as an exciton, with a hydrogenic wavefunction for the relative coordinate. Excitons have a large oscillator strength because of the proximity of the electron and hole and thus can dominate the absorption spectrum close to the fundamental band gap. In GaAs heterostructures, the exciton binding energy is of order 10 meV; thus, excitonic resonances appear only at low temperatures. Excitons and unbound electron-hole pairs exhibit dynamics on a femtosecond-to-picosecond time scale. These timescales, combined with the strong interaction with light, make ultrafast spectroscopy an ideal tool for studying carrier dynamics in semiconductors.Over the last two decades, excitonic resonances in semiconductors have been studied extensively by using ultrafast spectroscopy, primarily transient four-wave-mixing (TFWM) (1, 2). The measurements clearly showed signatures of many-body effects. The first and most prominent was a signal for the ''wrong'' time delay in a two-pulse TFWM experiment. Theoretically, such signals could arise from several effects including local fields (3, 4), biexcitons (5), excitation-induced dephasing (6, 7), or excitation-induced shift (8). Time resolving the signal also provided evidence for many-body contributions (9, 10), although it did not resolve the ambiguity regarding the underlying phenomena.Recent results using optical 2D Fourier transform spectroscopy (2DFTS) to study the exciton resonances have shown that much more information is obtained, promising a more stringent test of the theory (11). 2DFTS traces its roots to NMR (12). Recently, there has been significant progress in translating multidimensional NMR techniques into the infrared and optical domains for the study of vibrations (13) and electronic excitations (14-16) in molecules. Although the usefulness of adding a second dimension was recognized in TWFM studies of semiconductors (17-20), only the intensity of the emitted signal, not the phase-resolved electric field, was measured. The transient absorption experiments clearly show that detecting only the real part of the emitted field is advantageous (21, 22), but the effects of inhomogeneous broadening cannot be removed. 2DFTS combines the best...

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Section: Cocircular-polarized Excitation and Dominance Of Many-body Cmentioning

confidence: 99%

Polarization-dependent optical 2D Fourier transform spectroscopy of semiconductors

Zhang

Кузнецова

Meier

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

116

113

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“…1), we account for the dominant contributions to the QW response by evaluating the optically induced QW polarization in the 1s heavy-hole exciton basis. 29,31,32,34 We start from the coupled equations of motion for the field E k in the cavity modes with in-plane momentum k (treated in quasi-mode approximation 35 ) and the optically induced interband polarization amplitude p k in the embedded QW. We formulate our theory in the TE-TM basis for the optical fields in the cavity, Fig.…”

Section: The Theoretical Modelmentioning

confidence: 99%

Influence of exciton-exciton correlations on the polarization characteristics of polariton amplification in semiconductor microcavities

2007

Self Cite

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Based on a microscopic many-particle theory we investigate the influence of excitonic correlations on the vectorial polarization state characteristics of the parametric amplification of polaritons in semiconductor microcavities. We study a microcavity with perfect in-plane isotropy. A linear stability analysis of the cavity polariton dynamics shows that in the co-linear (TE-TE or TM-TM) pump-probe polarization state configuration, excitonic correlations diminish the parametric scattering process whereas it is enhanced by excitonic correlations in the cross-linear (TE-TM or TM-TE) configuration. Without any free parameters, our microscopic theory gives a quantitative understanding how many-particle effects can lead to a rotation or change of the outgoing (amplified) probe signal's vectorial polarization state relative to the incoming one's.

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“…The analysis was based on a fully microscopic theory that includes excitons and coherent biexcitons in semiconductor quantum wells, and was extended to account of inhomogeneous broadening and line-shape asymmetries [3] We have used a similar theoretical approach to predict signatures of 3-band quantum interferences (similar to the ones underlying the detector scheme) via the coherently-coupled heavy-hole-light-hole optical Stark effect in semiconductor quantum wells. Our combined theory-experiment investigation demonstrated clearly the similarities between Raman coherences in atomic level systems and corresponding non-radiative coherences (here: intervalence band coherences) in semiconductor quantum wells [4]. Note that electromagnetically-induced transparency (EIT) and other 3-level effects depend on the existence of a Raman coherence and that a demonstration of an intervalence band coherence (or other non-radiative coherences) is a necessary step toward the realization of EIT-like phenomena in semiconductor quantum wells.…”

Section: Statement Of the Problem Studiedmentioning

confidence: 99%

Feasibility Study of a Quantum-Interference Infrared Photon Detector

Binder¹,

Kwong²

2003

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Form Approve d O M B NO . 0704-0188Publ ic R e porting burde n for th is col l e ction of inform ation is e s tim ate d to ave rage 1 h our pe r re s pons e , incl uding th e tim e for re vie w ing ins tructions , s e arch ing e xis ting data s ource s , gath ering and m aintaining th e data needed, and com pl e ting and re vie w ing th e col l e ction of inform ation. Se nd com m e nt re garding th is burde n e s tim ate s or any oth e r as pe ct of th is col l ection of inform ation, incl uding s ugge s tions for re ducing th is burde n, to W as h ington H e adq uarte rs Se rvice s , D ire ctorate for inform ation O pe rations and R e ports , 1215 J e ffe rs on D avis H igh w ay, Suite 1204, Arl ington, VA 22202-4302, and to th e O ffice of M anage m e nt and Budge t, Pape rw ork R e duction Proje ct (0704-0188,) W as h ington, D C 20503.

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Evidence for Intervalence Band Coherences in Semiconductor Quantum Wells via Coherently Coupled Optical Stark Shifts

Cited by 53 publications

References 14 publications

Polarization-dependent optical 2D Fourier transform spectroscopy of semiconductors

Polarization-dependent optical 2D Fourier transform spectroscopy of semiconductors

Influence of exciton-exciton correlations on the polarization characteristics of polariton amplification in semiconductor microcavities

Feasibility Study of a Quantum-Interference Infrared Photon Detector

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