Real-space variational Gutzwiller wave functions for the Anderson-Hubbard model (2009)
Farhoodfar, A., Chen, X., Gooding, R. J., Atkinson, W. A.
Partially-projected Gutzwiller variational wavefunctions are used to describe the ground state of disordered interacting systems of fermions. We compare several different variational ground states...
Song, Yun, Bulut, S., Wortis, R., Atkinson, W. A.
We study the effect of strong correlations on the zero bias anomaly (ZBA) in disordered interacting systems. We focus on the two-dimensional extended Anderson-Hubbard model, which has both on-site...
Effect of CuO chains on the local density of states in the vortex phase of YBa_2Cu_3O_7 (2008)
We examine the effects of the CuO chains on the density of states in the vortex phase in YBa_2Cu_3O_7, via a calculation based on the tight-binding proximity model. In this model, chain...
Sonier, J. E., Ilton, M., Pacradouni, V., Kaiser, C. V., Sabok-Sayr, S. A., Ando, Y., ...
We report that in YBa2Cu3Oy and La2-xSrxCuO4 there is a spatially inhomogeneous response to magnetic field for temperatures T extending well above the bulk superconducting transition temperature Tc....
Wortis, R., Song, Yun, Atkinson, W. A.
With the goal of measuring localization in disordered interacting systems, we examine the finite-size scaling of the geometrically-averaged density of states calculated from the local Green's...
Role of CuO chains in vortex core structure in YBa2Cu3O{7-delta} (2007)
Atkinson, W. A., Sonier, J. E.
The Bogoliubov-deGennes equations are solved for a proximity model for YBa_2Cu_3O_{7-\delta} in a magnetic field. The model explicitly includes the effects of the one-dimensional CuO chains, whose...
Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard Model (2007)
Song, Yun, Wortis, R., Atkinson, W. A.
We study the two-dimensional paramagnetic Anderson-Hubbard model using an extension of dynamical mean-field theory that allows us to treat disorder and strong electronic correlations on equal...
Sonier, J. E., Sabok-Sayr, S. A., Callaghan, F. D., Kaiser, C. V., Pacradouni, V., Brewer, J. H., ...
We report on muon spin rotation measurements of the internal magnetic field distribution n(B) in the vortex solid phase of YBa2Cu3Oy (YBCO) single crystals, from which we have simultaneously...
Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films (2007)
Ngai, J. H., Atkinson, W. A., Wei, J. Y. T.
Scanning tunneling spectroscopy was performed on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} thin films for x= 0, 0.05, 0.15 and 0.20 at 4.2K. The measured spectra show main-gap, sub-gap and satellite...
Superfluid Suppression in d-Wave Superconductors due to Disordered Magnetism (2006)
The influence of static magnetic correlations on the temperature-dependent superfluid density \rho_s(T) is calculated for d-wave superconductors. In self-consistent calculations, itinerant holes form...
The geometrically-averaged density of states as a measure of localization (2006)
Song, Yun, Atkinson, W. A., Wortis, R.
Motivated by current interest in disordered systems of interacting electrons, the effectiveness of the geometrically averaged density of states, $\rho_g(\omega)$, as an order parameter for the...
Fazileh, F., Gooding, R. J., Atkinson, W. A., Johnston, D. C.
The compound LiAl_yTi_(2-y)O_4 undergoes a metal-to-insulator transition for y_c ~0 .33. This system, in the absence of strong electronic correlations, is a prototypical example of quantum site...
Many-Impurity Effects in Fourier Transform Scanning Tunneling Spectroscopy (2005)
Fourier transform scanning tunneling spectroscopy (FTSTS) is a useful technique for extracting details of the momentum-resolved electronic band structure from inhomogeneities in the local density of...
Stevens, K. M., Atkinson, W. A.
This paper has been withdrawn due to a sign error in the equation for F_11 which invalidates many results.
The tunneling spectrum of an inhomogeneously doped extended Hubbard model is calculated at the mean field level. Self-consistent solutions admit both superconducting and antiferromagnetic order,...
Magnetization relaxation in (Ga,Mn)As ferromagnetic semiconductors (2003)
Sinova, Jairo, Jungwirth, T., Liu, X., Sasaki, Y., Furdyna, J. K., Atkinson, W. A., ...
We describe a theory of Mn local-moment magnetization relaxation due to p-d kinetic-exchange coupling with the itinerant-spin subsystem in the ferromagnetic semiconductor (Ga,Mn)As alloy. The...
Power spectrum of many impurities in a d-wave superconductor (2003)
Zhu, Lingyin, Atkinson, W. A., Hirschfeld, P. J.
Recently the structure of the measured local density of states power spectrum of a small area of the \BSCCO (BSCCO) surface has been interpreted in terms of peaks at an "octet" of scattering wave...
Quantum interference in nested d-wave superconductors: a real-space perspective (2003)
Atkinson, W. A., Hirschfeld, P. J., Zhu, Lingyin
We study the local density of states around potential scatterers in d-wave superconductors, and show that quantum interference between impurity states is not negligible for experimentally relevant...
Two impurities in a d-wave superconductor:local density of states (2002)
Zhu, Lingyin, Atkinson, W. A., Hirschfeld, P. J.
We study the problem of two local potential scatterers in a d-wave superconductor, and show how quasiparticle bound state wave functions interfere. Each single-impurity electron and hole resonance...
Optical and Thermal-Transport Properties of an Inhomogeneous d-Wave Superconductor (2001)
Atkinson, W. A., Hirschfeld, P. J.
We calculate transport properties of disordered 2D d-wave superconductors from solutions of the Bogoliubov-de Gennes equations, and show that weak localization effects give rise to a finite frequency...
Hirschfeld, P. J., Atkinson, W. A.
We review work on the problem of disorder in the 2D d-wave superconducting state, and show that the symmetries of the normal state and the disorder distribution are vital for understanding the...
Nesting symmetries and diffusion in disordered d-wave superconductors (2001)
Yashenkin, A. G., Atkinson, W. A., Gornyi, I. V., Hirschfeld, P. J., Khveshchenko, D. V.
The low-energy density of states (DOS) of disordered 2D d-wave superconductors is extremely sensitive to details of both the disorder model and the electronic band structure. Using diagrammatic...
Nesting Symmetries and Diffusion in Disordered d-Wave Superconductors (2001)
Atkinson, W. A., Gornyi, I. V., Hirschfeld, P. J., Khveshchenko, D. V., Yashenkin, A. G.
Nesting symmetries and diffusion in disordered d wave superconductors. (2001)
Yashenkin, A.G., Atkinson, W.A., Gornyi, I.V., Hirschfeld, P.J., Khveshchenko, D.V.
Physical Review Letters, 86(2001) S.5982-85
Density of states "width parity" effect in d-wave superconducting quantum wires (2000)
Ziegler, K., Atkinson, W. A., Hirschfeld, P. J.
We calculate the density of states (DOS) in a clean mesoscopic d-wave superconducting quantum wire, i.e. a sample of infinite length but finite width $N$. For open boundary conditions, the DOS at...
Details of disorder matter in 2D d-wave superconductors (2000)
Atkinson, W. A., Hirschfeld, P. J., MacDonald, A. H., Ziegler, K.
We demonstrate that discrepancies between predicted low-energy quasiparticle properties in disordered 2D d-wave superconductors occur because of the unanticipated importance of disorder model details...
Inhomogeneous order-parameter suppression in disordered d-wave superconductors (2000)
Atkinson, W. A., Hirschfeld, P. J., MacDonald, A. H.
We report on a numerical study of disorder effects in 2D d-wave BCS superconductors. We compare exact numerical solutions of the Bogoliubov-deGennes (BdG) equations for the density of states...
Atkinson, W. A., Hirschfeld, P. J., MacDonald, A. H.
The single-impurity problem in d-wave superconductors with asymmetric bands is discussed. The effect of local order parameter suppression near the impurity is to shift the quasiparticle resonance....
Disorder and chain superconductivity in YBa_2Cu_3O_{7-\delta} (1998)
The effects of chain disorder on superconductivity in YBa_2Cu_3O_{7-\delta} are discussed within the context of a proximity model. Chain disorder causes both pair-breaking and localization. The...
Interlayer coupling in ferromagnetic semiconductor superlattices (1998)
Jungwirth, T., Atkinson, W. A., Lee, B. H., MacDonald, A. H.
We develop a mean-field theory of carrier-induced ferromagnetism in diluted magnetic semiconductors. Our approach represents an improvement over standard RKKY model allowing spatial inhomogeneity of...
Electrodynamics of a Clean Vortex Lattice (1998)
Atkinson, W. A., MacDonald, A. H.
We report on a microscopic evaluation of electrodynamic response for the vortex lattice state of a model s-wave superconductor. Our calculation accounts self-consistently for both quasiparticle and...
C-axis Transport in Bilayer Cuprates and Relation to Pseudogap (1997)
Wu, W. C., Atkinson, W. A., Carbotte, J. P.
We consider the effect of interband transitions on the c-axis conductivity, DC resistivity, and thermal conductivity in a plane-chain bilayer model of a cuprate. The relation between the c-axis...
The c axis optical conductivity of layered systems in the superconducting state (1997)
Atkinson, W. A., Carbotte, J. P.
In this paper, we discuss the c axis optical conductivity Re [sigma_c(omega)] in the high T_c superconductors, in the superconducting state. The basic premise of this work is that electrons...
The role of intermediate layers in the c-axis conductivity of layered superconductors (1997)
Atkinson, W. A., Wu, W. C., Carbotte, J. P.
A simplified model of c axis transport in the high T_c superconductors is presented. Expressions are found for the c axis optical conductivity, the d.c. resistivity, and the c axis penetration depth....
Effect of Interband Transitions on the c axis Penetration Depth of Layered Superconductors (1996)
Atkinson, W. A., Carbotte, J. P.
The electromagnetic response of a system with two planes per unit cell involves, in addition to the usual intraband contribution, an added interband term. These transitions affect the temperature...
Interband effects in the c-axis optical conductivity in YBaCuO (1996)
Atkinson, W. A., Carbotte, J. P.
The normal state optical conductivity is calculated for a layered metal with two layers per unit cell coupled through a transverse hopping matrix element $t_\perp$. The optical response involves an...
Atkinson, W. A., Carbotte, J. P.
We calculate the penetration depth $\lambda$ in the $a$, $b$ and $c$ directions for a simple model of YBa$_2$Cu$_3$O$_7$. In this model there are two layers---representing a CuO$_2$ plane and a CuO...
Critical Josephson Current in a Model Pb/YBa_2Cu_3O_7 Junction (1995)
Atkinson, W. A., Carbotte, J. P.
In this article we consider a simple model for a c--axis Pb/YBa_2Cu_3O_{7-\delta} Josephson junction. The observation of a nonzero current in such a junction by Sun et al. [A. G. Sun, D. A. Gajewski,...
Density of states of a layered S/N d-wave superconductor (1994)
Atkinson, W. A., Carbotte, J. P.
We calculate the density of states of a layered superconductor in which there are two layers per unit cell. One of the layers contains a d-wave pairing interaction while the other is a normal metal....