10,388 research outputs found
Political economy, political class, and political system in recivilianized Nigeria
African Studies Center Working Paper No. 4
The heat kernel expansion for the electromagnetic field in a cavity
We derive the first six coefficients of the heat kernel expansion for the
electromagnetic field in a cavity by relating it to the expansion for the
Laplace operator acting on forms. As an application we verify that the
electromagnetic Casimir energy is finite.Comment: 12 page
Evolution of the Fermi surface of BiTeCl with pressure
We report measurements of Shubnikov-de Haas oscillations in the giant Rashba
semiconductor BiTeCl under applied pressures up to ~2.5 GPa. We observe two
distinct oscillation frequencies, corresponding to the Rashba-split inner and
outer Fermi surfaces. BiTeCl has a conduction band bottom that is split into
two sub-bands due to the strong Rashba coupling, resulting in two
spin-polarized conduction bands as well as a Dirac point. Our results suggest
that the chemical potential lies above this Dirac point, giving rise to two
Fermi surfaces. We use a simple two-band model to understand the pressure
dependence of our sample parameters. Comparing our results on BiTeCl to
previous results on BiTeI, we observe similar trends in both the chemical
potential and the Rashba splitting with pressure.Comment: 6 pages, 5 figure
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