2018
DOI: 10.1103/physreve.98.012128
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Diffusion of a particle in the Gaussian random-energy landscape: Einstein relation and analytical properties of average velocity and diffusivity as functions of driving force

Abstract: We demonstrate that the Einstein relation for the diffusion of a particle in the random-energy landscape with the Gaussian density of states is an exclusive one-dimensional property and does not hold in higher dimensions. We also consider the analytical properties of the particle velocity and diffusivity for the limit of weak driving force and establish a connection between these properties and dimensionality and spatial correlation of the random-energy landscape.

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Cited by 2 publications
(2 citation statements)
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References 32 publications
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“…D can be related to the mobility, μ, through the three-dimensional Einstein-Smoluchowski relation:μ=qDkBTKMC, where q is the unit charge. The relation in Equation (4) is frequently employed in charge transport investigations [39,46,47], and is expected to provide a reasonable upper-bound for carrier diffusivity for systems with no external driving force [48]. Since our carrier trajectories are obtained in isolation (i.e., no Coulombic interactions with other carriers) and no external electric field is applied, we therefore expect the result to be a “best case” zero-field carrier mobility, μ0, that describes the diffusion of the carriers at low charge density, similar to time-of-flight experiments.…”
Section: Methodsmentioning
confidence: 99%
“…D can be related to the mobility, μ, through the three-dimensional Einstein-Smoluchowski relation:μ=qDkBTKMC, where q is the unit charge. The relation in Equation (4) is frequently employed in charge transport investigations [39,46,47], and is expected to provide a reasonable upper-bound for carrier diffusivity for systems with no external driving force [48]. Since our carrier trajectories are obtained in isolation (i.e., no Coulombic interactions with other carriers) and no external electric field is applied, we therefore expect the result to be a “best case” zero-field carrier mobility, μ0, that describes the diffusion of the carriers at low charge density, similar to time-of-flight experiments.…”
Section: Methodsmentioning
confidence: 99%
“…Di kisaran nilai E / p menengah, nilai mobilitas yang ditentukan dengan penampang transfer momentum JB akan lebih tinggi daripada mereka dengan penampang RB. Pertimbangkan sekarang hubungan antara karakteristik dan energi rata-rata (223)(224)(225)(226)(227)(228)(229) . Mari kita tulis ekspresi untuk elektron mobilitas.…”
Section: Kecepatan Driftunclassified