2004
DOI: 10.1103/physrevb.69.195305
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Metallicity and its low-temperature behavior in dilute two-dimensional carrier systems

Abstract: We theoretically consider the temperature and density dependent transport properties of semiconductor-based 2D carrier systems within the RPA-Boltzmann transport theory, taking into account realistic screened charged impurity scattering in the semiconductor. We derive a leading behavior in the transport property, which is exact in the strict 2D approximation and provides a zeroth order explanation for the strength of metallicity in various 2D carrier systems. By carefully comparing the calculated full nonlinea… Show more

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Cited by 68 publications
(77 citation statements)
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“…Note that the observed descent of σ xx with an ascent of T for μ 0 < || z | − SO | is associated with temperature dependence of screening of electron-impurity scattering. In previous studies on MIT in conventional 2D electron systems, finite-temperature screening plays a key role in the mechanism proposed by Das Sarma and Hwang [79][80][81]. In Fig.…”
Section: A Longitudinal Conductivitymentioning
confidence: 87%
“…Note that the observed descent of σ xx with an ascent of T for μ 0 < || z | − SO | is associated with temperature dependence of screening of electron-impurity scattering. In previous studies on MIT in conventional 2D electron systems, finite-temperature screening plays a key role in the mechanism proposed by Das Sarma and Hwang [79][80][81]. In Fig.…”
Section: A Longitudinal Conductivitymentioning
confidence: 87%
“…Based on estimates from surface probe measurements (5,8), and consistent with earlier work both in graphene (4,30) and in Si MOSFETs (28,40), we assume that the charged impurities lie in a plane at a distance d Ϸ 1 nm from the graphene sheet and calculate the voltage fluctuations taking into account the screening by using the RPA. The screened voltage fluctuation is a function of d and the carrier density n; a larger carrier density more effectively screens the charged impurities, whereas the potential fluctuations are larger for low carrier density.…”
mentioning
confidence: 80%
“…For example, the 2k F backscattering is suppressed [4][5][6][7] in SLG due to its chiral nature, whereas in the 2DEG, the 2k F backscattering plays a key role [12] in determining low density and low temperature carrier transport. We find that the 2k F backscattering is restored (and even enhanced) in the BLG because of the quadratic dispersion and, more importantly, due to the symmetry imposed by the two-layer structure.…”
mentioning
confidence: 99%