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

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Landau Level Spectroscopy of Broken Symmetry States in High Mobility Graphene on Boron Nitride Srijit Goswami, Paritosh Karnatak and Arindam Ghosh The presence of spin and valley degeneracy in graphene gives rise to four-fold degenerate Landau levels (LLs) in the presence of a magnetic field perpendicular to the plane of the graphene. Graphene devices on silicon oxide substrates typically exhibit very low mobility, resulting in significant broadening of LLs. As a result, any broken symmetry states are difficult to observe at reasonable magnetic fields. Placing graphene on atomically flat hexagonal Boron Nitride (BN) results in significantly higher carrier mobility. We have fabricated such high mobility graphene-BN heterostructures and show that the four-fold degeneracy of the LLs is completely lifted at moderate magnetic fields. Such broken symmetry states have been observed in a few studies previously, however their exact nature is still a matter of debate. We also show that charge transfer between graphene and a nearby defect site gives rise to discrete jumps in the resistance. In the presence of a magnetic field the size and nature of these resistance jumps is particularly sensitive to the position of the Fermi level. We discuss some preliminary results which indicate that such a graphene-defect system may allow for a more sensitive spectroscopy of the LLs, as compared to time averaged transport.
Signature of novel Plasmonic Dicke effect in 2D quantum dot solids mediated by surface plasmons of embedded nanoparticles Jaydeep Basu Quantum dot ensembles and solids find numerous applications from solar cells to novel nano-lasers. Understanding their optical and electrical properties and the ability to tune them is thus of vital importance. Here, we will discuss our recent work on photoluminescence (PL) from two dimensional solids made of CdSe quantum dots lightly doped with metal nanoparticles. The emission from the quantum dot solid can be tuned by controlling the packing of the solid, spectral overlap between the quantum dots and the metal nanoparticles as well as through doping concentration. While the PL from the quantum dots show expected variation at low density and large doping of gold nanoparticles, unexpected strong enhancement in PL occurs at low and intermediate doping, especially when the quantum dots and metal nanoparticles are spectrally at resonance. A recently suggested model [3] of plasmon mediated superradiance, due to virtual plasmon exchange between proximal quantum dots, leading to such enhancements seems to be the likely cause of such an unusual effect. Acknowledgements: The work presented here has been done in collaboration with Laxminaryanan Tripathi, M. Praveena, M. Haridas. References: 1. L. N. Tripathi, M. Praveena, J. K. Basu, Plasmonics (2012). 2. M. Haridas, L. N. Tripathi and J. K. Basu, Applied. Physics. Letter, 98, 063305 (2011). 3. Vitaliy N. Pustovit and Tigran V. Shahbazyan, Phys Rev Lett. 102, 077401 (2009).
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Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics

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