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Large-Scale Monte Carlo Study of a Realistic Lattice Model for Ga_(1-x)Mn_xAs
Yucel Yildirim, Gonzalo Alvarez, Adriana Moreo +1
The properties of Mn-doped GaAs are studied at several doping levels and hole compensations, using a real-space Hamiltonian on an fcc lattice that reproduces the valence bands of u…
Hyperfine interaction induced decoherence of electron spins in quantum dots
Wenxian Zhang, V. V. Dobrovitski, K. A. Al-Hassanieh +2
We investigate in detail, using both analytical and numerical tools, the decoherence of electron spins in quantum dots (QDs) coupled to a bath of nuclear spins in magnetic fields o…
Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
I. A. Sergienko, C. Sen, E. Dagotto
We show that the symmetry of the spin zigzag chain E phase of the orthorhombic perovskite manganites and nickelates allows for the existence of a finite ferroelectric polarization.…
Novel Phase Between Band and Mott Insulators in Two Dimensions
S. S. Kancharla, E. Dagotto
We investigate the ground state phase diagram of the half-filled repulsive Hubbard model in two dimensions in the presence of a staggered potential , the so-called ionic Hubbard…
Metallic interface at the boundary between band and Mott insulators
S. S. Kancharla, E. Dagotto
Motivated by experiments on atomically smooth layers of LaTiO, a Mott insulator, sandwiched between layers of SrTiO, a band insulator, a simple model for such heterostructu…
Dynamical Mean-Field Study of the Ferromagnetic Transition Temperature of a Two-Band Model for Colossal Magnetoresistance Materials
F. Popescu, C. Sen, E. Dagotto
The ferromagnetic (FM) transition temperature (Tc) of a two-band Double-Exchange (DE) model for colossal magnetoresistance (CMR) materials is studied using dynamical mean-field the…
Colossal Magnetoresistance Observed in Monte Carlo Simulations of the One- and Two-Orbital Models for Manganites
C. Şen, G. Alvarez, H. Aliaga +1
The one- and two-orbital double-exchange models for manganites are studied using Monte Carlo computational techniques in the presence of a robust electron-phonon coupling (but negl…
Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
G. Alvarez, H. Aliaga, C. Sen +1
Using Monte Carlo simulations and the two eg-orbital model for manganites, the stability of the CE and A-type antiferromagnetic insulating states is analyzed when quenched disorder…
Critical Temperatures of a Two-Band Model for Diluted Magnetic Semiconductors
F. Popescu, Y. Yildirim, G. Alvarez +2
Using Dynamical Mean Field Theory (DMFT) and Monte Carlo (MC) simulations, we study the ferromagnetic transition temperature Tc of a two-band model for Diluted Magnetic Semiconduct…
Applying Adaptive Time-Dependent DMRG to Calculate the Conductance of Strongly Correlated Nanostructures
K. A. Al-Hassanieh, A. E. Feiguin, J. A. Riera +2
A procedure based on the recently developed ``adaptive'' time-dependent density-matrix-renormalization-group (DMRG) technique is presented to calculate the zero temperature conduct…