Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics

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Evolution of fermionic superfluid across the crossover from three to two dimensions Sudeep Kumar Ghosh ∗ and Vijay B. Shenoy † Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012, India Motivated by recent experiments on the evolution of fermionic superfluid pairing from three to two dimensions, we construct and study a Bogoliubov-de Gennes theory that accurately accounts for the periodic potential that induces this dimensional crossover. We consider a system of spin- 1 2 fermions interacting in the singlet channel via a contact interaction confined by an optical lattice potential in the z-direction and the motion in plane is free. With the increase in potential depth, the system gets divided into stacks of two dimensional layers with gradually decreasing inter layer hopping. The mean field equations are solved numerically to obtain the Bloch bands. For small potential depth, the linear response of density and pairing gap of the system are obtained numerically and compared with that of perturbation theory calculations. In deep lattice limit the system becomes two dimensional and the binding energy is found to be in close agreement with the two dimensional result. The radio frequency spectrum of the system shows characteristic asymmetric dissociation peak structure and a clear pairing gap emerges with increasing lattice depth as seen in experiments. ∗ Electronic address: sudeep@physics.iisc.ernet.in † Electronic address: shenoy@physics.iisc.ernet.in
Title: Induced photoconductivity in large area graphene by electrochemical deposition of thin films Authors: Medini Padmanabhan, Uma Maheswari P, Shishir Kumar, Srinivasan Raghavan and Arindam Ghosh Abstract: In this work we study the optical response of large area graphene electrochemically integrated with light-sensitive semiconductors. Chemical vapor deposited (CVD) graphene is transferred onto a suitable substrate such as glass or silicon wafer. Two- point resistance of graphene is measured with and without a layer of electrodeposited CdS. We find that, in the presence of CdS, appreciable photoconductivity is induced in graphene. The hybrid-device is observed to respond to light at a much faster timescale compared to the characteristic photodesorption curves of bare graphene. We explore various avenues of integrating this growth technique with solar cell architectures.
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FOREWORD As a periodic review of it
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Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics

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