Electron-phonon scattering in a two-dimensional electron gas in a very strong magnetic field near the percolation threshold

Iordanskǐ, S. V.; Levinson, Y.

doi:10.1103/physrevb.53.7308

Cited by 18 publications

(21 citation statements)

References 20 publications

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“…In the absence of magnetic impurities, the phase relaxation originates from inelastic scattering, arising from the contribution of electron-phonon ͑ e-ph −1 ͒ and electron-electron ͑ ee −1 ͒ scatterings. On the basis of the theory of electron-phonon interaction, 26,27 the dephasing rate can be expressed as −1 ϰ T 2 / l e for T ӷបC t / k B l e and −1 ϰ T 4 l e for T ӶបC t / k B l e , where C t is the transverse velocity of sound. In order to compare the values of −1 obtained from our experimental data with electron-phonon-scattering rate, we have calculated the value of e-ph −1 from the theory of electronphonon interaction by using C t =3ϫ 10 3 m / s of GaAs systems.…”

Section: Resultsmentioning

confidence: 99%

Anomalous dephasing scattering rate of two-dimensional electrons in double quantum well structures

et al. 2008

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The results on the measurement of electrical conductivity and magnetoconductivity of a GaAs double quantum well between 0.5 and 1.1 K are reported. The zero magnetic-field conductivity is well described from the point of view of contributions made by both the weak localization and electron-electron interaction. At low field and low temperature, the magnetoconductivity is dominated by the weak localization effect only. Using the weak localization method, we have determined the electron dephasing times and tunneling times t . Concerning tunneling, we concluded that t presents a minimum around the balance point; concerning dephasing, we observed an anomalous dependence on temperature and conductivity ͑or elastic mean free path͒ of . This anomalous behavior cannot be explained in terms of the prevailing concepts for the electron-electron interaction in high-mobility two-dimensional electron systems.

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Section: Resultsmentioning

confidence: 99%

Anomalous dephasing scattering rate of two-dimensional electrons in double quantum well structures

et al. 2008

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“…It is worth mentioning that the temperature range where the linear T -dependence of τ −1 ph is valid increases at high magnetic fields [41]. The saturation of τ −1 ph due the spontaneaous phonon emission [43] is expected to take place typically at low temperatures in the kelvin range, which is beyond the present analysis.…”

Section: Theoretical Analysis Of Magnetotransport Datamentioning

confidence: 72%

Classical percolation fingerprints in the high temperature regime of the quantum Hall effect

et al. 2013

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We have performed magnetotransport experiments in the hightemperature regime (up to 50 K) of the integer quantum Hall effect for two-dimensional electron gases in semiconducting heterostructures. While the magnetic field dependence of the classical Hall law presents no anomaly at high temperatures, we find a breakdown of the Drude-Lorentz law for the longitudinal conductance beyond a crossover magnetic field B c 1 T, which turns out to be correlated with the onset of the integer quantum Hall effect at low temperatures. We show that the high magnetic field regime at B > B c can be understood in terms of classical percolative transport in a smooth disordered potential. From the temperature dependence of the peak longitudinal conductance, we extract 7

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“…According to calculations by Iordanski et al [21] that just considers the electron-phonon interaction, τ to show a decrease with increasing conductivity because the condition T ≫hC t /k B l is valid. As clearly seen from Fig.…”

Section: Resultsmentioning

confidence: 99%

Anomalous dephasing of two-dimensional electrons in an AlGaAs/GaAs parabolic quantum well structure

Gao

SpringThorpe

et al. 2011

Solid State Communications

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Electron-phonon scattering in a two-dimensional electron gas in a very strong magnetic field near the percolation threshold

Cited by 18 publications

References 20 publications

Anomalous dephasing scattering rate of two-dimensional electrons in double quantum well structures

Anomalous dephasing scattering rate of two-dimensional electrons in double quantum well structures

Classical percolation fingerprints in the high temperature regime of the quantum Hall effect

Anomalous dephasing of two-dimensional electrons in an AlGaAs/GaAs parabolic quantum well structure

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