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Spontaneous Magnetization And Electron Momentum Density In Three-Dimensional Quantum Dots, R. Saniz, B. Barbiellini, A. B. Denison, A. Bansil
Spontaneous Magnetization And Electron Momentum Density In Three-Dimensional Quantum Dots, R. Saniz, B. Barbiellini, A. B. Denison, A. Bansil
Bernardo Barbiellini
We discuss an exactly solvable model Hamiltonian for describing the interacting electron gas in a quantum dot. Results for a spherical square-well confining potential are presented. The ground state is found to exhibit striking oscillations in spin polarization with dot radius at a fixed electron density. These oscillations are shown to induce characteristic signatures in the momentum density of the electron gas, providing a route for direct experimental observation of the dot magnetization via spectroscopies sensitive to the electron momentum density.
Positron-Annihilation Study Of The Electronic Structure Of Cu91ge9, P. E. Mijnarends, L. P.L.M. Rabou, K. E.H.M. Hanssen, A. Bansil
Positron-Annihilation Study Of The Electronic Structure Of Cu91ge9, P. E. Mijnarends, L. P.L.M. Rabou, K. E.H.M. Hanssen, A. Bansil
Arun Bansil
A novel effect of alloying on the electron momentum density in a disordered α-Cu₉₁Ge₉ alloy is reported. The effect, which is the appearance of a bump in the derivative spectra at low momenta, is predicted by theory employing the coherent-potential approximation and is observed in two-dimensional angular correlation experiments on the alloy. It reflects the presence of an s-p impurity band far below the Fermi level. Accurate experimental values for the Fermi-surface radii k100 and k110 and for the associated disorder-induced smearings in CuGe are also reported for the first time.
Spontaneous Magnetization And Electron Momentum Density In Three-Dimensional Quantum Dots, R. Saniz, B. Barbiellini, A. B. Denison, A. Bansil
Spontaneous Magnetization And Electron Momentum Density In Three-Dimensional Quantum Dots, R. Saniz, B. Barbiellini, A. B. Denison, A. Bansil
Arun Bansil
We discuss an exactly solvable model Hamiltonian for describing the interacting electron gas in a quantum dot. Results for a spherical square-well confining potential are presented. The ground state is found to exhibit striking oscillations in spin polarization with dot radius at a fixed electron density. These oscillations are shown to induce characteristic signatures in the momentum density of the electron gas, providing a route for direct experimental observation of the dot magnetization via spectroscopies sensitive to the electron momentum density.
Electron Momentum Densities In Disordered Muffin-Tin Alloys, A. Bansil, R. S. Rao, P. E. Mijnarends, L. Schwartz
Electron Momentum Densities In Disordered Muffin-Tin Alloys, A. Bansil, R. S. Rao, P. E. Mijnarends, L. Schwartz
Arun Bansil
The application of average t-matrix (ATA) and coherent potential (CPA) approximations to the calculation of average electron momentum density ρ(p) in random muffin-tin alloys AₓB₁₋ₓ is considered. The necessary equations for the general matrix elements of the operators describing scattering by the CPA atom and also by an A or B atom embedded in the effective medium are derived. Various versions of the ATA for ρ(p) are discussed. Several ρ(p) curves calculated on the basis of the CPA and ATA in CuₓNi₁₋ₓ are presented. These results are used to delineate the effects on ρ(p) of self-consistency in the treatment of …
Reconstructed Three-Dimensional Electron Momentum Density In Lithium: A Compton Scattering Study, Yoshikazu Tanaka, Y. Sakurai, A. T. Stewart, N. Shiotani, P. J. Mijnarends, S. Kaprzyk, A. Bansil
Reconstructed Three-Dimensional Electron Momentum Density In Lithium: A Compton Scattering Study, Yoshikazu Tanaka, Y. Sakurai, A. T. Stewart, N. Shiotani, P. J. Mijnarends, S. Kaprzyk, A. Bansil
Arun Bansil
The three-dimensional electron momentum density ρ(p) in Li is reconstructed via a direct Fourier transform method which is free from functional assumptions concerning the shape of ρ(p). For this purpose, 12 high-resolution Compton profiles are measured, and corresponding highly accurate computations carried out within the band theory framework. Extensive comparisons between the ρ(p)’s reconstructed from the theoretical and experimental profiles with each other and with the true (without reconstruction) underlying computed ρ(p) are used to gain insight into the accuracy of our procedures, and to delineate the effects of various parameters (filtering, resolution, eTc.) on the reconstructed ρ(p). …