6,617 research outputs found
Ballistic Hot Electron Transport in Graphene
We theoretically study the inelastic scattering rate and the carrier mean
free path for energetic hot electrons in graphene, including both
electron-electron and electron-phonon interactions. Taking account of optical
phonon emission and electron-electron scattering, we find that the inelastic
scattering time and the mean free path
for electron densities . In particular, we find that the mean free path exhibits a
finite jump at the phonon energy due to electron-phonon
interaction. Our results are directly applicable to device structures where
ballistic transport is relevant with inelastic scattering dominating over
elastic scattering.Comment: 4 page
Quantized Casimir Force
We investigate the Casimir effect between two-dimensional electron systems
driven to the quantum Hall regime by a strong perpendicular magnetic field. In
the large separation (d) limit where retardation effects are essential we find
i) that the Casimir force is quantized in units of 3\hbar c \alpha^2/(8\pi^2
d^4), and ii) that the force is repulsive for mirrors with same type of
carrier, and attractive for mirrors with opposite types of carrier. The sign of
the Casimir force is therefore electrically tunable in ambipolar materials like
graphene. The Casimir force is suppressed when one mirror is a charge-neutral
graphene system in a filling factor \nu=0 quantum Hall state.Comment: 4.2 page
China and the internationalisation of the sociology of contemporary work and employment
The China e-Special Issue brings together 11 articles on the sociology of contemporary work and employment in China which have been published in WES in the past two decades, highlighting the increasing frequency of submissions, and also reflecting the diversity, complexity and plurality of work and employment in the region. The foci of debates include the changing fault lines of work and employment; the changing relationships between state, employers and workers; the impact of rural to urban migration and urbanisation on the labour process and employment configurations; the interrelations between production and social reproduction and its gendered dimensions; and the need to develop established methodologies further given the changing nature of the research subject
On the optimal control of linear systems with incomplete information
Optimal control of linear systems with incomplete informatio
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