Auger scattering between Landau levels in a two-dimensional electron gas

Tsitsishvili, E.; Levinson, Y.

doi:10.1103/physrevb.56.6921

Cited by 13 publications

(8 citation statements)

References 11 publications

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“…Processes involving the scattering of two electrons from Landau level n, to Landau levels n + m and n − q with m = q, are forbidden due to quasi angular momentum (k-vector) conservation. It has been shown theoretically 24 that the most efficient scattering is to the adjacent Landau levels (m = 1). The total probability of scattering to the outlying Landau levels (m = 2, 3, 4, · · · ) is roughly the same as the probability of scattering to the nearest Landau level (m = 1).…”

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confidence: 99%

Slowing hot-carrier relaxation in graphene using a magnetic field

et al. 2009

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A degenerate pump-probe technique is used to investigate the non equilibrium carrier dynamics in multi-layer graphene. Two distinctly different dynamics of the carrier relaxation are observed.A fast relaxation (∼ 50 fs) of the carriers after the initial effect of phase space filling followed by a slower relaxation (∼ 4 ps) due to thermalization. Both relaxation processes are less efficient when a magnetic field is applied at low temperatures which is attributed to the suppression of the electron-electron Auger scattering due to the non equidistant Landau level spacing of the Dirac fermions in graphene.

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Slowing hot-carrier relaxation in graphene using a magnetic field

et al. 2009

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“…Since they involve inter-LL scattering of charged carriers, the e-h symmetry no longer holds which gives rise to interactions between MX's. It should be emphasized that since the LL's are discrete, the amplitude of Auger process can be large and, in fact, is restricted mainly by the inhomogeneous [24,25] or homogeneous (due to phonons) LL broadening. In fact, in strong field, the relevant energy scale, E 0 ∼ e 2 /κl, is set by interactions, so that an adequate description of the nonlinear optical response should treat the Auger processes nonperturbatively.…”

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confidence: 99%

Ultrafast Auger Spectroscopy of Quantum Well Excitons in Strong Magnetic Fields

Shahbazyan

2004

Structural Chemistry

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We study theoretically the ultrafast nonlinear optical response of quantum well excitons in a perpendicular magnetic field. We address the role of many-body correlations originating from the electron scattering between Landau levels (LL). In the linear optical response, the processes involving inter-LL transitions are suppressed provided that the magnetic field is sufficiently strong. However, in the nonlinear response, the Auger processes involving inter-LL scattering of two photoexcited electrons remain unsuppressed. We show that Auger scattering plays the dominant role in the coherent exciton dynamics in strong magnetic field. We perform numerical calculations for the third-order four-wave-mixing (FWM) polarization which incorporate the Auger processes nonperturbatively. We find that inter-LL scattering leads to a strong enhancement and to oscillations of the FWM signal at negative time delays. These oscillations represent quantum beats between optically-inactive two-exciton states related to each other via Auger processes.

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“…The Auger process rate in a quantum well with magnetic field has also been calculated. 7 However, the real band structure of semiconductors has been neglected and only interband transitions between electron Landau levels have been taken into account. The rates of Auger processes in semiconductors with complicated valence band structure ͑i.e., with heavy hole states taken into account͒ in a magnetic field have not been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Auger recombination in semiconductor quantum wells in a magnetic field

Samsonidze

Zegrya

2001

Phys. Rev. B

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Auger process involving two electrons from the conduction band and a heavy hole from the valence band in semiconductor heterostructures with quantum wells is investigated for the case of a magnetic field applied normal to heteroboundaries. It is shown that there exist three different mechanisms of Auger recombination, associated with ͑I͒ electron scattering at interface with transition into the continuous spectrum, ͑II͒ short-range Coulomb interaction in the quantum well with transition into the continuous spectrum, and ͑III͒ resonance transition into the discrete spectrum. All these processes are thresholdless. The Auger recombination coefficients analytically calculated for the processes I, II, and III show different dependencies on temperature, magnetic field, and quantum well parameters. In the limit of an infinitely wide quantum well, processes I and II merge to form a bulk threshold Auger process, while process III remains thresholdless resonance one. In the limit of infinitely weak magnetic field, process I remains thresholdless, process II becomes a quasithreshold process ͑i.e., its threshold energy slightly depends on temperature͒, and process III transforms into a nonresonance process with a threshold. The results obtained are new and have no analogies in the literature.

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Auger scattering between Landau levels in a two-dimensional electron gas

Cited by 13 publications

References 11 publications

Slowing hot-carrier relaxation in graphene using a magnetic field

Slowing hot-carrier relaxation in graphene using a magnetic field

Ultrafast Auger Spectroscopy of Quantum Well Excitons in Strong Magnetic Fields

Auger recombination in semiconductor quantum wells in a magnetic field

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