Interaction-induced effects in the nonlinear coherent response of quantum-well excitons

Wägner, Hans; Schätz, Alexander; Langbein, Wolfgang Werner; Hvam, Jørn Märcher; Smirl, Arthur L.

doi:10.1103/physrevb.60.4454

Cited by 42 publications

(31 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although we do not use the phrase, the signals these terms produce have been called interaction-induced effects [41,42]. Local fields act as density-dependent source terms that modify the field interaction, and they are included by introducing a new electric field, ∆(t), that includes the original electric field, ∆ l (t), and the LFEs, as given by…”

Section: A Sum-over-states Modelmentioning

confidence: 99%

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

et al. 2011

View full text Add to dashboard Cite

We use fifth-order two-dimensional electronic spectroscopy to measure coherent four-particle dynamics in a semiconductor nanostructure. By using optical polarization control in two-quantum measurements enabled by the COLBERT spectrometer, we separate coherent signals due to bound biexcitons and unbound two-exciton correlations. The rephasing nature of the measurement allows us to separate homogeneous from inhomogeneous contributions to the two-quantum lineshapes. We find that, unlike the bound biexciton state, the energy of the unbound pair and its homogeneous linewidth depend on the laser fluence. Simulations using an extended phenomenological model help determine the primary interaction mechanism that leads to the formation of the unbound exciton pair; the model also indicates that seventh-order interactions contribute to the measured spectra under high pulse fluences.

show abstract

Section: A Sum-over-states Modelmentioning

confidence: 99%

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In contrast the FWM polarization at XX h is generated by a term containing only one exponential function with interexciton dephasing rate γ hh . Since no biexciton density is created up to third order, EID is inactive at the biexciton induced transition [4]. At resonance X l the polarization is determined by terms containing exponential functions with rates γ lh and γ ll between two light-hole exciton transitions and again by EID with rate 2γ h .…”

Section: Resultsmentioning

confidence: 99%

“…The center of the 22 meV broad excitation pulse was set to 2.808 eV, in order to avoid continuum contributions and predominantly excite the 11H X h heavy-hole exciton at 2.806 eV and weakly excite the light-hole 11L X l exciton transition at 2.821 eV. Two pulse four-wave mixing experiments [4] further indicate that the exciton transitions are nearly homogeneously broadened in this ZnSe SQW.…”

Section: Methodsmentioning

confidence: 99%

Dephasing of interacting σ⁺ and σ⁻ excitons in a ZnSe single quantum well

Wägner

Tripathy

2004

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

PACS 42.50.Md, 71.55.Gs We investigate coherences between σ + and σ -exciton states in a 10 nm thick ZnSe/ZnMgSe single quantum well by spectrally resolved three-pulse degenerate four-wave mixing using circularly polarized 100 fs pulses. Intensity dependent measurements are performed to study the influence of exciton-exciton scattering on their dephasing rates. The experiments reveal nearly equal zero-density dephasing rates for coherences between σ + and σ -heavy-and/or light-hole exciton states as compared to the dephasing rate of the interband coherence between these states and the ground state. The measurements also demonstrate that exciton-exciton scattering destroys the coherence between heavy-and light-hole excitons about three times more effectively than the coherence between σ + and σ -heavy-hole excitons.

show abstract

“…Polarization-dependent four-wave mixing ͑FWM͒ quantum beats [1][2][3][4][5][6][7][8][9][10][11] have been observed after simultaneous excitations of two optical transitions, associated with heavy hole and light hole. The signal magnitude and its beat phase were found to depend on the relative linear polarization of the pump and test pulses.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, they predicted identical FWM intensities for the two cases: pump and probe having either parallel or perpendicular linear polarizations. Subsequently, a successful explanation was claimed to be given by the biexciton theory, 3,[5][6][7][8][9][10][11] invoking a phenomenological exciton-exciton coupling attributed to Coulombic interactions. However, it has remained obscure why the SBE would fail for the phenomenon in a semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Polarization-dependent quantum beats of four-wave mixing in the Luttinger model for bulk semiconductors

2007

View full text Add to dashboard Cite

We examine the description of quantum beats in four-wave mixing with bulk semiconductors within the framework of the Luttinger-Kohn model. An analytic expression for their dependence on the relative linear polarization of pump and probe is derived, taking only the band structure and coherent interaction of the light waves with the semiconductor medium into account. Herewith all features seen in experiments are very well reproduced, e.g., the vanishing of the beats for an angle 0 Ϸ 76°between the polarizations of pump and probe. Therefore, as opposed to general belief based on earlier theoretical work, no ad hoc exciton-exciton Coulomb interaction has to be invoked to describe the observed phase and magnitude of the quantum beats for copolarized or for cross-polarized test and pump pulses.

show abstract

Interaction-induced effects in the nonlinear coherent response of quantum-well excitons

Cited by 42 publications

References 18 publications

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

Dephasing of interacting σ⁺ and σ⁻ excitons in a ZnSe single quantum well

Polarization-dependent quantum beats of four-wave mixing in the Luttinger model for bulk semiconductors

Contact Info

Product

Resources

About

Interaction-induced effects in the nonlinear coherent response of quantum-well excitons

Cited by 42 publications

References 18 publications

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

Coherent two-exciton dynamics measured using two-quantum rephasing two-dimensional electronic spectroscopy

Dephasing of interacting σ+ and σ− excitons in a ZnSe single quantum well

Polarization-dependent quantum beats of four-wave mixing in the Luttinger model for bulk semiconductors

Contact Info

Product

Resources

About

Dephasing of interacting σ⁺ and σ⁻ excitons in a ZnSe single quantum well