Results 71 to 80 of about 266,938 (298)

Hund's coupling and the metal-insulator transition in the two-band Hubbard model

, 2005
The Mott-Hubbard metal-insulator transition is investigated in a two-band Hubbard model within dynamical mean-field theory. To this end, we use a suitable extension of Wilson's numerical renormalization group for the solution of the effective two-band ...
75, ?no, Bulla, Bulla, Bulla, Bünemann, Castellani, Ezhov, Florens, Frésard, Georges, Han, Hubbard, Imada, Jarrell, Koch, Koga, Koga, Koga, Kojima, Kotliar, Kotliar, Liebsch, Limelette, Lu, McWhan, Metzner, Oliveira, Pruschke, R. Bulla, Sakai, Sakai, Th. Pruschke, Wilson, Zhuravlev   +34 more
core   +1 more source

Switchable Magnonic Crystals Based on Spin Crossover/CrSBr Heterostructures

Advanced Materials, EarlyView.
Multiscale modeling is employed to investigate the functionality of a light‐controlled, tunable magnonic crystal based on spin‐crossover Fe‐pz molecules integrated with a monolayer of CrSBr. Ab initio simulations confirm that the molecules remain functional on the CrSBr surface, while a semiclassical elastic model demonstrates that light‐induced ...
Andrei Shumilin, Sourav Dey, Denisa Coltuneac, Laurentiu Stoleriu, José J. Baldoví   +4 more
wiley   +1 more source

Emergent Spin Supersolids in Frustrated Quantum Materials

Advanced Materials, EarlyView.
This review highlights developments in the study of spin super‐solids in frustrated quantum materials. Advanced experimental characterizations and computational studies enable a comprehensive understanding of the driving mechanisms of spin super‐solidity in various layered transition‐metal compounds, bridging materials, experiments, and theory aspects.
Yixuan Huang, Seiji Yunoki, Sadamichi Maekawa   +2 more
wiley   +1 more source

Density-dependent tunneling in the extended Bose–Hubbard model

New Journal of Physics, 2013
Recently, it has become apparent that when the interactions between polar molecules in optical lattices become strong, the conventional description using the extended Hubbard model has to be modified by additional terms, in particular a density-dependent
Michał Maik, Philipp Hauke, Omjyoti Dutta, Maciej Lewenstein, Jakub Zakrzewski   +4 more
doaj   +1 more source

One-electron singular spectral features of the 1D Hubbard model at finite magnetic field

Nuclear Physics B, 2017
The momentum, electronic density, spin density, and interaction dependences of the exponents that control the (k,ω)-plane singular features of the σ=↑,↓ one-electron spectral functions of the 1D Hubbard model at finite magnetic field are studied.
J.M.P. Carmelo, T. Čadež
doaj   +1 more source

Full Counting Statistics for Interacting Fermions with Determinantal Quantum Monte Carlo Simulations

, 2017
We present a method for computing the full probability distribution function of quadratic observables for the Fermi-Hubbard model within the framework of determinantal quantum Monte Carlo. Especially, in cold atoms experiments with single site resolution,
Büchler, Hans Peter, Humeniuk, Stephan
core   +1 more source

Fidelity approach to the Hubbard model [PDF]

Physical Review B, 2008
We use the fidelity approach to quantum critical points to study the zero temperature phase diagram of the one-dimensional Hubbard model. Using a variety of analytical and numerical techniques, we analyze the fidelity metric in various regions of the phase diagram, with particular care to the critical points. Specifically we show that close to the Mott
Venuti L Campos, Cozzini M, Buonsante P, Massel F, BrayAli N, Zanardi P   +5 more
openaire   +5 more sources

Unveiling Exsolution‐Induced Giant Electronic and Magnetic Property Changes in Non‐Stoichiometric Titanate Perovskite Thin Films

Advanced Materials, EarlyView.
A giant insulator to metal transition and emergent superparamagnetism are revealed by nanoparticle exsolution in non‐stoichiometric titanate perovskite thin films. By combining transport, synchrotron spectroscopy, and first‐principles calculations, this work reveals how defect reconfiguration and lattice reconstruction fundamentally reshape electronic ...
Sungil Kim, June Ho Lee, Yaolong Xing, Dongchang Kim, Haeseong Jeong, Mongjun Jeong, Manuel Valvidares, Stuart S. P. Parkin, Sang Ho Oh, Donghwa Lee, Hyojin Yoon, Hyeon Han   +11 more
wiley   +1 more source

Out-of-Time-Order Correlation at a Quantum Phase Transition

, 2017
In this paper we numerically calculate the out-of-time-order correlation functions in the one-dimensional Bose-Hubbard model. Our study is motivated by the conjecture that a system with Lyapunov exponent saturating the upper bound $2\pi/\beta$ will have ...
Fan, Ruihua, Shen, Huitao, Zhai, Hui, Zhang, Pengfei   +3 more
core   +1 more source

Spin stiffness in the Hubbard model [PDF]

Journal of Physics A: Mathematical and General, 1996
The spin stiffness $ρ_{\rm s}$ of the repulsive Hubbard model that occurs in the hydrodynamic theory of antiferromagnetic spin waves is shown to be the same as the thermodynamically defined stiffness involved in twisting the order parameter. New expressions for $ρ_{\rm s}$ are derived, which enable easier interpretation, and connections with ...
van Leeuwen, J. M. J., du Croo de Jongh, M. S. L., Denteneer, P. J. H.   +2 more
openaire   +2 more sources