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

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High mobility graphene devices Paritosh Karnatak, T Phanindra Sai, Srijit Goswami, Subhamoy Ghatak, Arindam Ghosh Department of Physics, Indian Institute of Science, Bangalore-560012 Graphene being a single atomic layer is significantly affected by the substrate, as the intrinsic properties of graphene are often masked in the presence of disorder. It is well known that the presence of substrate trap charges, polar phonons, roughness and ripples collectively hinder studies on ultrahigh quality graphene. It was also predicted that if the effect of such external disorder could be eliminated, graphene would show extremely high mobility. Here we report the methods followed in making high mobility graphene devices. One of the ways to achieve high mobility is by etching out the substrate underneath the graphene. In such suspended graphene devices we have achieved mobilities of ~150,000 cm 2 /V-s. Such devices are potential candidates to explore new physics and may find viable applications as sensor devices. Another approach to produce high mobility graphene is to transfer graphene on to thin flakes of hexagonal boron nitride, which has a similar arrangement of atoms as graphite. Boron nitride flakes are found to be atomically flat, do not contain dangling bonds or traps. The result is that graphene on boron nitride has significantly higher mobilities ~50,000 cm 2 /V-s, which is significantly higher than the common graphene/SiO 2 /Si system. In addition, these systems are mechanically more stable than suspended graphene structures, and open up the possibilities of designing more intricate device structures.
Measurement of Proton-Carbon Dipolar Couplings using an improved DAPT pulse sequence R.V. Sudheer Kumar $, # and K.V. Ramanathan # Department of Physics $ , NMR research centre # Indian Institute of Science, Bangalore, India Dipolar couplings provide valuable information on order and dynamics of liquid crystals. Experiments to measure heteronuclear dipolar couplings are very powerful and widely important in solid state NMR, since it provides site specific dipolar couplings in aligned samples. Interpretation of these heteronuclear dipolar couplings are hampered by the chemical shift anisotropy (CSA) and dipolar interactions among abundant spins ( 1 H- 1 H couplings). Additionally, multiple 13 C- 1 H dipolar couplings found in complicated systems make the spectra more difficult to use. For static samples the complications are resolved partially by separated local field (SLF) spectroscopy where the local field due to heteronuclear dipolar coupling and chemical shift interactions are separated into two frequency domains in a 2D experiment. A method of separated local field experiment is presented for measuring heteronuclear dipolar couplings in oriented systems. This method is based on Dipolar assisted polarization transfer (DAPT). Compared to rotating frame techniques based on Hartmann-Hahn match, this approach is easy to implement and is independent of any matching condition. DAPT can be utilized either as a proton encoded local field (PELF) technique or as a separated local field (SLF) technique, which mean s that the heteronuclear dipolar coupling can be obtained by following either evolution of the abundant spin like proton (PELF) or that of the rare that of carbon (SLF).The DAPT pulse sequence has been improved for efficient homonuclear decoupling by the interpretation of BLEW-48 pulse sequence. The implementations of the modified DAPT experiment both as a PELF and as SLF on oriented liquid crystalline samples have been carried out. The performance of this experiment is compared with PISEMA.
Page 3: FOREWORD As a periodic review of it
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Page 9 and 10: List of Posters No. Presenter Title
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Page 14 and 15: Possible nature of internal disorde
Page 16 and 17: A new model of flow induced voltage
Page 18 and 19: Landau Level Spectroscopy of Broken
Page 20 and 21: Evidence of gradient in dynamics of
Page 22 and 23: A reversible shear-induced crystall
Page 24 and 25: Confinement of Spin Waves in Grids
Page 26 and 27: Flow Enhanced Pairing and Other Sto
Page 28 and 29: Heteronuclear Double Quantum Correl
Page 30 and 31: Probing superconductivity in the 2D
Page 32 and 33: Freezing of the octahedral tilt nea
Page 35: POSTER ABSTRACTS
Page 38 and 39: Unzipping Force Analysis to determi
Page 40 and 41: Can interaction between emergent ex
Page 44 and 45: Ultrafast NMR Techniques in Inhomog
Page 46 and 47: Investigating DNA hybridization thr
Page 48 and 49: Title : Measurement of Forces appli
Page 50 and 51: Superconducting fluctuations, Anoma
Page 52 and 53: Title of abstract: Transport proper
Page 54 and 55: Random matrix theory and gene corre
Page 56 and 57: Study of effect of alkali mixture o
Page 58 and 59: Magnetic, Dielectric and Transport
Page 60 and 61: Thermoelectric properties of chalco
Page 62 and 63: Realization of Fermionic Superfluid
Page 64 and 65: Flow Induced Alignment of water mol
Page 66 and 67: Universal Conductance Fluctuations
Page 68 and 69: Evolution of fermionic superfluid a
Page 70 and 71: Microwave assisted synthesis of sin
Page 72 and 73: Using cis peptide containing fragme
Page 74 and 75: Optoelectronic properties of graphe
Page 76 and 77: Violation of Chandrasekhar mass lim

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

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