Search Results - (Author, Cooperation:M. Capone)
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1Latest Papers from Table of Contents or Articles in PressA. Perucchi, P. Di Pietro, S. Lupi, R. Sopracase, A. Tebano, G. Giovannetti, F. Petocchi, M. Capone, and D. Di Castro
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-01-12Publisher: American Physical Society (APS)Print ISSN: 1098-0121Electronic ISSN: 1095-3795Topics: PhysicsKeywords: Electronic structure and strongly correlated systemsPublished by: -
2Latest Papers from Table of Contents or Articles in PressA. Amaricci, A. Valli, G. Sangiovanni, B. Trauzettel, and M. Capone
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-07-25Publisher: American Physical Society (APS)Print ISSN: 1098-0121Electronic ISSN: 1095-3795Topics: PhysicsKeywords: Electronic structure and strongly correlated systemsPublished by: -
3Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-07-03Publisher: American Physical Society (APS)Print ISSN: 1098-0121Electronic ISSN: 1095-3795Topics: PhysicsKeywords: Electronic structure and strongly correlated systemsPublished by: -
4Latest Papers from Table of Contents or Articles in PressM. Angeli, D. Mandelli, A. Valli, A. Amaricci, M. Capone, E. Tosatti, and M. Fabrizio
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-12-19Publisher: American Physical Society (APS)Print ISSN: 1098-0121Electronic ISSN: 1095-3795Topics: PhysicsKeywords: Electronic structure and strongly correlated systemsPublished by: -
5Latest Papers from Table of Contents or Articles in PressD. W. Fu ; H. L. Cai ; Y. Liu ; Q. Ye ; W. Zhang ; Y. Zhang ; X. Y. Chen ; G. Giovannetti ; M. Capone ; J. Li ; R. G. Xiong
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-01-26Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
6Latest Papers from Table of Contents or Articles in PressCilento, F., Manzoni, G., Sterzi, A., Peli, S., Ronchi, A., Crepaldi, A., Boschini, F., Cacho, C., Chapman, R., Springate, E., Eisaki, H., Greven, M., Berciu, M., Kemper, A. F., Damascelli, A., Capone, M., Giannetti, C., Parmigiani, F.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-02-24Publisher: American Association for the Advancement of Science (AAAS)Electronic ISSN: 2375-2548Topics: Natural Sciences in GeneralPublished by: -
7Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect - 75.30.Et Exchange and superexchange interactionsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: It is shown that the layered antiferromagnetic order in stoechiometric cannot be understood purely from electronic interactions. On the contrary, it mainly results from strong cooperative Jahn-Teller deformation. Those involve a compression of the Mn-O octahedron along the c-axis (mode Q 3 〈 0), while alternate Jahn-Teller deformations occur in the ab-plane (mode Q2). These deformations stabilize a certain type of orbital ordering. The resulting superexchange couplings are calculated by exact diagonalization, taking into account both eg and t2g orbitals. The main result is that antiferromagnetic (ferromagnetic) coupling along the c-direction (ab-planes) can be understood only if the Jahn-Teller energy is much larger than the superexchange couplings, which is consistent with experiments. This mechanism contrasts with that based on weak Jahn-Teller coupling which instead predicts elongation along the c-axis (Q 3 〉 0). The crucial role of the deformation anisotropy is also emphasized.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1572-9605Source: Springer Online Journal Archives 1860-2000Topics: Electrical Engineering, Measurement and Control TechnologyPhysicsNotes: Abstract We study the crossover to small polarons in the Holstein model for finitedensities in presence of strong electronic correlations. The small polaronformation condition λ〉1, which holds for a single particle in theadiabatic regime ω0/t≪1 is generalized to the many particle case bymeans of simple physical arguments. It is shown that a general criterion canbe formulated for polaron formation, provided that incoherent 1/λcorrections are taken into account.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 71.38.+i Polarons and electron-phonon interactions - 63.20.Kr Phonon-electron and phonon-phonon interactions - 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27.+a Strongly correlated electron systems; heavy fermionsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: We investigate polaron formation in a many-electron system in the presence of a local repulsion sufficiently strong to prevent local-bipolaron formation. Specifically, we consider a Hubbard-Holstein model of interacting electrons coupled to dispersionless phonons of frequency . Numerically solving the model in a small one-dimensional cluster, we find that in the nearly adiabatic case , the necessary and sufficient condition for the polaronic regime to occur is that the energy gain in the atomic (i.e., extremely localized) regime overcomes the energy of the purely electronic system . In the antiadiabatic case, , polaron formation is instead driven by the condition of a large ionic displacement (g being the electron-phonon coupling). Dynamical properties of the model in the weak and moderately strong coupling regimes are also analyzed.Type of Medium: Electronic ResourceURL: