Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials (2008)
Jacko, A. C., Powell, B. J., Fjaerestad, J. O.
The Kadowaki-Woods ratio (KWR) is not universal: it takes very different values in different materials. We introduce a ratio, closely related to the KWR, that is universal and depends on only...
Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet (2006)
Zheng, W., Fjaerestad, J. O., Singh, R. R. P., McKenzie, R. H., Coldea, R.
We use series expansion methods to calculate the dispersion relation of the one-magnon excitations for the spin-(1)/(2) triangular-lattice nearest-neighbor Heisenberg antiferromagnet above a...
Anomalous excitation spectra of frustrated quantum antiferromagnets (2006)
Zheng, W. H., Fjaerestad, J. O., Singh, R. R. P., McKenzie, R. H., Coldea, R.
We use series expansions to study the excitation spectra of spin-1/2 antiferromagnets on anisotropic triangular lattices. For the isotropic triangular lattice model (TLM), the high-energy spectra...
Orbital currents and charge density waves in a generalized Hubbard ladder (2006)
Fjaerestad, J. O., Marston, J. B., Schollwock, U.
We study a generalized Hubbard model on the two-leg ladder at zero temperature, focusing on a parameter region with staggered flux (SF)/d-density wave (DDW) order. To guide our numerical...
Entanglement and boundary critical phenomena (2006)
Zhou, H. Q., Barthel, T., Fjaerestad, J. O., Schollwock, U.
We investigate boundary critical phenomena from a quantum-information perspective. Bipartite entanglement in the ground state of one-dimensional quantum systems is quantified using the Renyi entropy...
Phase diagram of the three band half-filled Cu-O two-leg ladder (2005)
Lee, S., Marston, J. B., Fjaerestad, J. O.
We determine the phase diagram of the half-filled two-leg ladder both at weak and strong coupling, taking into account the Cu d_{x^2-y^2} and the O p_x and p_y orbitals. At weak coupling,...
Phase diagram of the three-band half-filled Cu-O two-leg ladder (2005)
Lee, S., Marston, J. B., Fjaerestad, J. O.
We determine the phase diagram of the half-filled two-leg ladder both at weak and strong coupling, taking into account the Cu d(x)(2)-y(2) and the O p(x) and p(y) orbitals. At weak coupling,...
Orbital currents and charge density waves in a generalized Hubbard ladder (2004)
Fjaerestad, J. O., Marston, J. B., Schollwoeck, U.
We study a generalized Hubbard model on the two-leg ladder at zero temperature, focusing on a parameter region with staggered flux (SF)/d-density wave (DDW) order. To guide our numerical...
Infrared Hall angle in the d-density-wave state: A comparison of theory and experiment (2004)
Tewari, S., Chakravarty, S., Fjaerestad, J. O., Nayak, C., Thompson, R. S.
Infrared Hall measurements in the pseudogap phase of the high-T-c cuprates are addressed within the framework of the ordered d-density-wave state. The zero-temperature Hall frequency omega(H) is...
Broken time-reversal symmetry in strongly correlated ladder structures (2003)
Schollwock, U., Chakravarty, S., Fjaerestad, J. O, Marston, J. B., Troyer, M.
We provide, for the first time, in a doped strongly correlated system (two-leg ladder), a controlled theoretical demonstration of the existence of a state in which long-range ordered orbital currents...
Broken time-reversal symmetry in strongly correlated ladder structures (2002)
Schollwoeck, U., Chakravarty, Sudip, Fjaerestad, J. O., Marston, J. B., Troyer, M.
We provide, for the first time, in a doped strongly correlated system (two-leg ladder), a controlled theoretical demonstration of the existence of a state in which long-range ordered orbital currents...
Staggered Flux Phase in a Model of Strongly Correlated Electrons (2002)
Marston, J. B., Fjaerestad, J. O., Sudbo, Asle
We present numerical evidence for the existence of a staggered flux (SF) phase in the half-filled two-leg t-U-V-J ladder, with true long-range order in the counter-circulating currents. The...
Staggered flux phase in a model of strongly correlated electrons (2002)
Marston, J. B., Fjaerestad, J. O., Sudbo, A.
We present numerical evidence for the existence of a staggered flux (SF) phase in the half-filled two-leg t-U-V-J ladder, with true long-range order in the countercirculating currents. The...
Staggered orbital currents in the half-filled two-leg ladder (2002)
Fjaerestad, J. O., Marston, J. B.
Using Abelian bosonization with a careful treatment of the Klein factors, we show that a certain phase of the half-filled two-leg ladder, previously identified as having spin-Peierls order, instead...
Staggered orbital currents in the half-filled two-leg ladder (2001)
Fjaerestad, J. O., Marston, J. B.
Using Abelian bosonization with a careful treatment of the Klein factors, we show that a certain phase of the half-filled two-leg ladder, previously identified as having spin-Peierls order, instead...
Fjaerestad, J. O., Sudbo, A., Luther, A.
We calculate zero-temperature correlation functions for a model of 2D interacting electrons with short-range interactions and a square Fermi surface. The model was arrived at by mapping electronic...
We investigate the effect of k-space broadening of the interlayer pairing kernel on the critical temperature T_c and the k-dependence of the gap function in a one-dimensional version of the...