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138 papers · 1 filter
Optical conductivity in the t-J-Holstein Model
L. Vidmar, J. Bonca, S. Maekawa
Using recently developed numerical method we compute charge stiffness and optical conductivity of the t-J model coupled to optical phonons. Coherent hole motion is most strongly in…
Possible d0 ferromagnetism in MgO doped with nitrogen
Bo Gu, Nejat Bulut, Timothy Ziman +1
We study the possibility of d0 ferromagnetism in the compound MgO doped with nitrogen (N). The Haldane-Anderson impurity model is formulated within the tight-binding approximation…
Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures
A. Tsukazaki, A. Ohtomo, M. Kawasaki +9
We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1-xO/ZnO single heterostructures…
Electronic structure of heavily electron-doped BaFeCoAs studied by angle-resolved photoemission
Y. Sekiba, T. Sato, K. Nakayama +9
We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFeCoAs. We find that the two ho…
Evolutionary dynamics and fixation probabilities in directed networks
Naoki Masuda, Hisashi Ohtsuki
We investigate the evolutionary dynamics in directed and/or weighted networks. We study the fixation probability of a mutant in finite populations in stochastic voter-type dynamics…
Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
K. Nakayama, T. Sato, P. Richard +8
We have performed high-resolution angle-resolved photoemission spectroscopy on the optimally-doped BaKFeAs compound and determined the accurate momentum dep…