66 citations · 509 across the 22 of their papers we have counts for
22 papers
Local Density of the Bose Glass Phase
K. Hettiarachchilage, C. Moore, V. G. Rousseau +3
We study the Bose-Hubbard model in the presence of on-site disorder in the canonical ensemble and conclude that the local density of the Bose glass phase behaves differently at inc…
The Bose-Hubbard model on a triangular lattice with diamond ring-exchange
V. G. Rousseau, K. Hettiarachchilage, K. -M. Tam +2
Ring-exchange interactions have been proposed as a possible mechanism for a Bose-liquid phase at zero temperature, a phase that is compressible with no superfluidity. Using the Sto…
Generalized Multiband Typical Medium Dynamical Cluster Approximation: Application to (Ga,Mn)N
Yi Zhang, R. Nelson, Elisha Siddiqui +7
We generalize the multiband typical medium dynamical cluster approximation and the formalism introduced by Blackman, Esterling and Berk so that it can deal with localization in mul…
Dual-fermion approach to the Anderson-Hubbard model
P. Haase, S. -X. Yang, T. Pruschke +2
We apply the recently developed dual fermion algorithm for disordered interacting systems to the Anderson-Hubbard model. This algorithm is compared with dynamical cluster approxima…
Finite Cluster Typical Medium Theory for Disordered Electronic Systems
C. E. Ekuma, C. Moore, H. Terletska +4
We use the recently developed typical medium dynamical cluster (TMDCA) approach~[Ekuma \etal,~\textit{Phys. Rev. B \textbf{89}, 081107 (2014)}] to perform a detailed study of the A…
Metal-Insulator-Transition in a Weakly interacting Disordered Electron System
C. E. Ekuma, S. -X. Yang, H. Terletska +4
The interplay of interactions and disorder is studied using the Anderson-Hubbard model within the typical medium dynamical cluster approximation. Treating the interacting, non-loca…
Spectral changes in layered -electron systems induced by Kondo hole substitution in the boundary-layer
Sudeshna Sen, J. Moreno, M. Jarrell +1
We investigate the effect of disorder on the dynamical spectrum of layered -electron systems. With random dilution of -sites in a single Kondo insulating layer, we explore th…
Competing magnetic states, disorder, and the magnetic character of Fe3Ga4
J. H. Mendez, C. E. Ekuma, Y. Wu +11
The physical properties of metamagnetic FeGa single crystals are investigated to explore the sensitivity of the magnetic states to temperature, magnetic field, and sample h…
Study of off-diagonal disorder using the typical medium dynamical cluster approximation
H. Terletska, C. E. Ekuma, C. Moore +3
We generalize the typical medium dynamical cluster approximation (TMDCA) and the local Blackman, Esterling, and Berk (BEB) method for systems with off-diagonal disorder. Using our…
A Typical Medium Dynamical Cluster Approximation for the Study of Anderson Localization in Three Dimensions
C. E. Ekuma, H. Terletska, K. -M. Tam +3
We develop a systematic typical medium dynamical cluster approximation that provides a proper description of the Anderson localization transition in three dimensions (3D). Our meth…
Dual-fermion approach to interacting disordered fermion systems
S. -X. Yang, P. Haase, H. Terletska +4
We generalize the recently introduced dual fermion (DF) formalism for disordered fermion systems by including the effect of interactions. For an interacting disordered system the c…
Mean-field embedding of the dual fermion approach for correlated electron systems
S. -X. Yang, H. Terletska, Z. Y. Meng +2
To reduce the rapidly growing computational cost of the dual fermion lattice calculation with increasing system size, we introduce two embedding schemes. One is the real fermion em…
Re-examining the electronic structure of germanium: A first-principle study
C. E. Ekuma, M. Jarrell, J. Moreno +2
We report results from an efficient, robust, ab-initio method for self-consistent calculations of electronic and structural properties of Ge. Our non-relativistic calculations empl…
Dual Fermion Method for Disordered Electronic Systems
H. Terletska, S. -X. Yang, Z. Y. Meng +2
While the coherent potential approximation (CPA) is the prevalent method for the study of disordered electronic systems, it fails to capture non-local correlations and Anderson loc…
Electronic, structural, and elastic properties of metal nitrides XN (X = Sc, Y): A first principle study
C. E. Ekuma, D. Bagayoko, M. Jarrell +1
We utilized a simple, robust, first principle method, based on basis set optimization with the BZW-EF method, to study the electronic and related properties of transition metal mon…
First principle electronic, structural, elastic, and optical properties of strontium titanate
C. E. Ekuma, M. Jarrell, J. Moreno +1
We report self-consistent ab-initio electronic, structural, elastic, and optical properties of cubic SrTiO perovskite. Our non-relativistic calculations employed a generalize…
Solving the Parquet Equations for the Hubbard Model beyond Weak Coupling
Ka-Ming Tam, H. Fotso, S. -X. Yang +4
We find that imposing the crossing symmetry in the iteration process considerably extends the range of convergence for solutions of the parquet equations for the Hubbard model. Whe…
Dual Fermion Dynamical Cluster Approach for Strongly Correlated Systems
S. -X. Yang, H. Fotso, H. Hafermann +4
We have designed a new multi-scale approach for Strongly Correlated Systems by combining the Dynamical Cluster Approximation (DCA) and the recently introduced dual-fermion formalis…
Role of the van Hove Singularity in the Quantum Criticality of the Hubbard Model
K. -S. Chen, S. Pathak, S. -X. Yang +5
A quantum critical point (QCP), separating the non-Fermi liquid region from the Fermi liquid, exists in the phase diagram of the 2D Hubbard model [Vidhyadhiraja et. al, Phys. Rev.…
Using off-diagonal confinement as a cooling method
V. G. Rousseau, K. Hettiarachchilage, M. Jarrell +2
In a recent letter [Phys. Rev. Lett. 104, 167201 (2010)] we proposed a new confining method for ultracold atoms on optical lattices, based on off-diagonal confinement (ODC). This m…
Thermodynamics of the Quantum Critical Point at Finite Doping in the 2D Hubbard Model: A Dynamical Cluster Approximation Study
K. Mikelsons, E. Khatami, D. Galanakis +3
We study the thermodynamics of the two-dimensional Hubbard model within the dynamical cluster approximation. We use continuous time quantum Monte Carlo as a cluster solver to avoid…
Pure Mott phases in confined ultracold atomic systems
V. G. Rousseau, G. G. Batrouni, D. E. Sheehy +2
We propose a novel scheme for confining atoms to optical lattices by engineering a spatially-inhomogeneous hopping matrix element in the Hubbard-model (HM) description, a situation…