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Research Summary:

Electron Momentum Density and Compton Profile in Disordered Alloys," J. Phys. Chem. Solids 62, 2191 (2001), A. Bansil and B. Barbiellini.ary:

The recent research interests of Professor Bansil have focused on questions concerning the electronic structure and spectroscopy of high-Tc superconductors and other complex materials. Professor Bansil's group has developed and implemented the theoretical methodology for carrying out first-principles calculations of spectral intensities relevant for angle-resolved photoemission and positron-annihilation angular correlation spectra in systems of the complexity of the high-Tc's within the framework of the conventional local-density-approximation. Approaches for a realistic treatment of effects of substitutions and of oxygen non-stoichometry on the electronic states in the high-Tc's have also been developed. An effort to decipher Fermi surface signatures as well as effects of electron-electron correlations via the high-resolution Compton scattering spectra is in progress. These investigations have yielded important new insights into the existence of Fermi surface, the nature of electronic states near the Fermi energy, as well as the mechanism of superconductivity in the high-Tc's. Professor Bansil's research effort involves extensive collaboration with groups within and outside United States. The following publications give an overview of recent highlights of the research program.

Recent Publications:

Tanmoy Das, R. S. Markiewicz, and A. Bansil: "Nodeless d-wave superconducting pairing due to residual antiferromagnetism in underdoped Pr2-xCexCuO 4-.," Physical Review Letters 98, 197004 (2007).

R. S. Markiewicz and A. Bansil, "Collapse of the magnetic gap of cuprate superconductors within a three-band model of resonant inelastic x-ray scattering," Physical Review Letters 96, 107005 (2006).

J. Kwiatkowaska, B. Barbiellini, S. Kaprzyk, A. Bansil, H. Kawata and N. Shiotani, "Anomalous electronic correlations in the ground state momentum density of Al97Li3," Physical Review Letters 96, 186403 (2006).

Hsin Lin, S. Sahrakorpi, R. S. Markiewicz and A. Bansil, "Raising Bi-O bands above the Fermi energy level of hole doped Bi2212 and other cuprate superconductors," Physical Review Letters 96, 097001 (2006).

S. W. H. Eijt, A. van Veen, H. Schut, P. E. Mijnarends, A. B. Denison, B. Berbiellini and A. Bansil, "Study of colloidal quantum dot surfaces using an innovative thin-film positron 2D-ACAR method," Nature Materials 5, 23(2006); Also, written up as a news highlight piece in the science magazine, Nano Today, February 2006, pp. 14.

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