TY  - JOUR
A1  - Zhang, Xin
A1  - Wu, Wei
A1  - Li, Gang
A1  - Wen, Lin
A1  - Sun, Qing
A1  - Ji, An-Chun
T1  - Phase diagram of interacting Fermi gas in spin-orbit coupled square lattices
JF  - New Journal of Physics
N2  - The spin-orbit (SO) coupled optical lattices have attracted considerable interest. In this paper, we investigate the phase diagram of the interacting Fermi gas with Rashba-type spin-orbit coupling (SOC) on a square optical lattice. The phase diagram is investigated in a wide range of atomic interactions and SOC strength within the framework of the cluster dynamical mean-field theory (CDMFT). We show that the interplay between the atomic interactions and SOC results in a rich phase diagram. In the deep Mott insulator regime, the SOC can induce diverse spin ordered phases. Whereas near the metal-insulator transition (MIT), the SOC tends to destroy the conventional antiferromagnetic fluctuations, giving rise to distinctive features of the MIT. Furthermore, the strong fluctuations arising from SOC may destroy the magnetic orders and trigger an order to disorder transition in close proximity of the MIT.
KW  - ultracold
KW  - hubbard-model
KW  - physics transition
KW  - metal-insulator transition
KW  - cluster dynamical mean-field theory
KW  - atomic gases
KW  - mean-field theory
KW  - mott insulator
KW  - optical lattice
KW  - weak ferromagnetism
KW  - quantum gases
KW  - superfluid
KW  - spin-orbit coupling
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-151475
VL  - 17
IS  - 073036
ER  - 
TY  - JOUR
A1  - Hansmann, P.
A1  - Parragh, N.
A1  - Toschi, A.
A1  - Sangiovanni, G.
A1  - Held, K.
T1  - Importance of d-p Coulomb interaction for high T-C cuprates and other oxides
JF  - New Journal of Physics
N2  - Current theoretical studies of electronic correlations in transition metal oxides typically only account for the local repulsion between d-electrons even if oxygen ligand p-states are an explicit part of the effective Hamiltonian. Interatomic interactions such as U-pd between d- and (ligand) p-electrons, as well as the local interaction between p-electrons, are neglected. Often, the relative d-p orbital splitting has to be adjusted 'ad hoc' on the basis of the experimental evidence. By applying the merger of local density approximation and dynamical mean field theory to the prototypical case of the three-band Emery dp model for the cuprates, we demonstrate that, without any 'ad hoc' adjustment of the orbital splitting, the charge transfer insulating state is stabilized by the interatomic interaction U-pd. Our study hence shows how to improve realistic material calculations that explicitly include the p-orbitals.
KW  - correlated electrons
KW  - dynamical mean field theory
KW  - transition metal oxides
KW  - fermions
KW  - superconductivity
KW  - energy bands
KW  - transition metals
KW  - correlated systems
KW  - mean-field theory
KW  - electronic-structure calculations
KW  - inplane spectral weight
KW  - Hubbard model
KW  - infinite dimensions
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-117165
SN  - 1367-2630
VL  - 16
IS  - 33009
ER  -