Quantum-kinetic dephasing in resonantly excited semiconductor quantum wells

Mieck, B.; Haug, H.; Hügel, W.; Heinrich, M.; Wegener, Martin

doi:10.1103/physrevb.62.2686

Cited by 35 publications

(36 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given the sensitivity of the biexciton signal to the ratio of homogeneous to inhomogeneous line broadening observed in the APM calculations, it is important to resolve a more detailed model to describe the lineshape and decay of the TI-2PE in the context of the APM before drawing quantitative conclusions from the data. Particularly on the short time scales being probed here, memory effects in dephasing processes involving coupling to nuclear motion, as well as the details of the electronic response to the bare Coulomb potential within the initially-prepared electron-hole pair may need to be explicitly considered [89]. Memory effects are indicated when a separation of time scales between homogeneous and inhomogeneous line broadening is not possible [13,90,91].…”

Section: Discussionmentioning

confidence: 99%

Photon echo studies of biexcitons and coherences in colloidal CdSe quantum dots

Colonna¹,

Yang²,

Scholes³

2005

Physica Status Solidi (b)

View full text Add to dashboard Cite

PACS 71.35.Cc, 78.47.+p, 78.67.Hc Nonlinear optical properties of colloidal quantum dots are studied to elucidate the significance and nature of many-body effects. Two-pulse photon echo studies of nanocrystalline CdSe quantum dots are reported for samples dispersed in a poly(butylmethacrylate) film (4.4 K). Oscillations are observed in the experimental data that are attributed to 3/2 1 1 e S S -3/2 2 1 e S S biexciton cohererences. Signals are simulated using a phenomenological model based on the many-body description of the dynamics (the average polarization model). It is found that the electronic coherences and the nonlinear response originating from biexciton source terms are important, but their manifestation in the photon echo signals is strongly influenced by the interplay between homogeneous and inhomogeneous line broadening.

show abstract

Section: Discussionmentioning

confidence: 99%

Photon echo studies of biexcitons and coherences in colloidal CdSe quantum dots

Colonna¹,

Yang²,

Scholes³

2005

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…In a similar experiment, the power law has been found to be governed not by n -1/D but by n -1/3 for both a quantum well and the bulk [6]. In a further verification, the time evolution of the optical polarization field coupled to the CCS was calculated by applying the quantum kinetic theory (QKT); the results also indicated the n -1/3 dependence [6]. Therefore, the previous comparison [2] becomes ineffective as regards the screening issue.…”

mentioning

confidence: 88%

“…The dependence was generally accepted [5] until a conflicting result was obtained [6]. In a similar experiment, the power law has been found to be governed not by n -1/D but by n -1/3 for both a quantum well and the bulk [6].…”

mentioning

confidence: 95%

Dynamical screening and memory effect of non‐equilibrium carrier–carrier scattering in GaAs

Lee

2008

Physica Status Solidi (b)

View full text Add to dashboard Cite

Given the absence of a Coulomb singularity in the quantum regime, the dependence of dynamical screening in non‐equilibrium carrier–carrier scattering on the dimension of GaAs was examined using the generalized Kadanoff–Baym equation. The screening in a quantum well is stronger than that in the bulk but this has not been previously understood. This dependence also applies to the Fröhlich interaction because, in momentum space, the electric flux density of small‐angle scattering is stronger in a lower dimension. Calculations also revealed the memory effect; based on these, the quantum kinetic oscillation was conceptualized. As time evolves, the scattering rate increases at the early stage and causes hole burning in the carrier's distribution. This effect enables the dependence of the average relaxation time on the carrier density to become independent of the sample's dimension, unlike in the Boltzmann regime. This work can eliminate the apparent contradiction between Shank's and Haug's experimental results. Finally, an experimental problem regarding the anomalously fast thermalization of non‐equilibrium carriers immersed in cold electrons in a quantum well was investigated and a reasonable explanation is presented. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

“…The main point in this quantum-kinetic description (for a review see [1][2][3]) is the non-Markovian treatment of scattering between carriers, polarization and elementary excitations, as plasmons and phonons. Evidence for quantum-kinetic effects both in Coulomb and LO-phonon scattering was found in several experiments, investigating the decay of the four-wave mixing signal [4][5][6].However, these time resolved investigations give no spectral information and cannot be performed for lower excitations, where excitonic effects become important, in particular the limit of linear response cannot be achieved. In this paper we focus on this limit.…”

mentioning

confidence: 96%

Quantum kinetics and linear optical response of semiconductors

Manzke

Klähn

Henneberger

2003

phys. stat. sol. (c)

View full text Add to dashboard Cite

We investigate the influence of quantum-kinetic effects on the linear optical properties of semiconductors near the band edge. These effects arise from a non-Markovian treatment of the scattering terms in the semiconductor Bloch equations and result in a strong dependence of many-body effects on the energy. We compare with results using a Markovian approximation of scattering, where the many-body effects do not depend on energy and correspond to those in a quasi-particle approximation. We demonstrate, that within such a treatment both linewidth and shift of the exciton are strongly overestimated. Finally, the Mott density of excitons differs by a factor of two. The importance of the quantum-kinetic approach for the explanation of polariton-pulse propagation experiments is shown.1 Introduction Ultra-short laser pulses in the order of a few femto-seconds have opened the possibility to study the temporal evolution of many-body effects in a laser excited semiconductor. This includes as well the generation and dephasing of the laser induced coherent polarization and the formation of carriers populations and their relaxation into quasi-equilibrium. A new concept for the theoretical description of the coupled kinetics of coherent polarization and carriers had to be developed in order to explain the experimental findings. The main point in this quantum-kinetic description (for a review see [1][2][3]) is the non-Markovian treatment of scattering between carriers, polarization and elementary excitations, as plasmons and phonons. Evidence for quantum-kinetic effects both in Coulomb and LO-phonon scattering was found in several experiments, investigating the decay of the four-wave mixing signal [4][5][6].However, these time resolved investigations give no spectral information and cannot be performed for lower excitations, where excitonic effects become important, in particular the limit of linear response cannot be achieved. In this paper we focus on this limit. We consider a pump-probe experiment, where carriers are pumped and relaxed into quasi-equilibrium, and the optical response is detected by a weak probe pulse. We demonstrate, that (i) quantum-kinetic effects in the scattering of the probe-induced polarization with the elementary excitations (plasmons, LO-phonons) in the electron-hole plasma play an important role, even at lowest excitations, and (ii) give new insight and better understanding of these many-body effects from the viewpoint of Green's function description for the excited semiconductor.

show abstract

Quantum-kinetic dephasing in resonantly excited semiconductor quantum wells

Cited by 35 publications

References 14 publications

Photon echo studies of biexcitons and coherences in colloidal CdSe quantum dots

Photon echo studies of biexcitons and coherences in colloidal CdSe quantum dots

Dynamical screening and memory effect of non‐equilibrium carrier–carrier scattering in GaAs

Quantum kinetics and linear optical response of semiconductors

Contact Info

Product

Resources

About