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North Central Tablelands Hydrogeologic Summary from Domestic Well-Water Quality in Rural Nebraska
Berry Curvature in Graphene: A New Approach
In the present paper we have directly computed the Berry curvature terms
relevant for Graphene in the presence of an \textit{inhomogeneous} lattice
distortion. We have employed the generalized Foldy Wouthuysen framework,
developed by some of us \cite{ber0,ber1,ber2}. We show that a non-constant
lattice distortion leads to a valley-orbit coupling which is responsible to a
valley-Hall effect. This is similar to the valley-Hall effect induced by an
electric field proposed in \cite{niu2} and is the analogue of the spin-Hall
effect in semiconductors \cite{MURAKAMI, SINOVA}. Our general expressions for
Berry curvature, for the special case of homogeneous distortion, reduce to the
previously obtained results \cite{niu2}. We also discuss the Berry phase in the
quantization of cyclotron motion.Comment: Slightly modified version, to appear in EPJ
Regional Hydrogeologic Summaries from Domestic Well-water Quality in Rural Nebraska -- Sand Hills
Regional Hydrogeologic Summaries from Domestic Well-water Quality in Rural Nebraska -- East Central Dissected Plains
Regional Hydrogeologic Summaries from Domestic Water-well Quality in Nebraska -- Hat Creek-White River Drainage Basin
Regional Hydrogeologic Summaries from Domestic Well-water Quality in Rural Nebraska -- Missouri River Lowlands
Regional Hydrogeologic Summaries from Domestic Well-water Quality in Rural Nebraska -- East Central Dissected Plains
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