176 citations · 1.9k across the 82 of their papers we have counts for
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Multifractal analysis of the metal-insulator transition in anisotropic systems
Frank Milde, Rudolf A. Römer, Michael Schreiber
We study the Anderson model of localization with anisotropic hopping in three dimensions for weakly coupled chains and weakly coupled planes. The eigenstates of the Hamiltonian, as…
Absence of backscattering at integrable impurities in one-dimensional quantum many-body systems
A. Punnoose, H. -P. Eckle, R. A. Römer
We study interacting one dimensional (1D) quantum lattice gases with integrable impurities. These model Hamiltonians can be derived using the quantum inverse scattering method for…
Conservation laws in the continuum systems
Rudolf A. Römer, B. Sriram Shastry, B. Sutherland
We study the conservation laws of both the classical and the quantum mechanical continuum type systems. For the classical case, we introduce new integrals of motion along t…
Enhanced Charge and Spin Currents in the One-Dimensional Disordered Mesoscopic Hubbard Ring
Rudolf A. Römer, Alexander Punnoose
We consider a one-dimensional mesoscopic Hubbard ring with and without disorder and compute charge and spin stiffness as a measure of the permanent currents. For finite disorder we…
GAPS IN THE HEISENBERG-ISING MODEL
R. A. Roemer, H. -P. Eckle, B. Sutherland
We report on the closing of gaps in the ground state of the critical Heisenberg-Ising chain at momentum . For half-filling, the gap closes at special values of the anisotropy $Δ…
Exact Solution of a One-Dimensional Multicomponent Lattice Gas with Hyperbolic Interaction
Bill Sutherland, Rudolf A. Römer, B. Sriram Shastry
We present the exact solution to a one-dimensional multicomponent quantum lattice model interacting by an exchange operator which falls off as the inverse-sinh-square of the distan…
Transport Properties of a One-Dimensional Two-Component Quantum Liquid with Hyperbolic Interactions
Rudolf A. Römer, Bill Sutherland
We present an investigation of the sinh-cosh (SC) interaction model with twisted boundary conditions. We argue that, when unlike particles repel, the SC model may be usefully viewe…
Exact Derivation of Luttinger Liquid Relation in a One-Dimensional Two-Component Quantum System with Hyperbolic Interactions
Rudolf A. Römer, Bill Sutherland
We present an exact calculation of the Luttinger liquid relation for the one-dimensional, two-component SC model in the interaction strength range by appropriately varying…
Critical Exponents for the SC-Model in the Zero Sector
Rudolf A. Römer, Bill Sutherland
In this paper, we continue our investigation of a one-dimensional, two-component, quantum many-body system in which like particles interact with a pair potential $s(s+1)/{\rm sinh}…
Exiton, Spinon and Spin Wave Modes in an Exactly Soluble One-Dimensional Quantum Many-Body System
Bill Sutherland, Rudolf A. R"omer
In this paper, we present the exact solution to a one-dimensional, two-component, quantum many-body system in which like particles interact with a pair potential $s(s+1)/{\rm sinh}…
Test of Conformal Invariance in One-Dimensional Quantum Liquid with Long-Range Interaction
Rudolf A. Römer, Bill Sutherland
We numerically study the momentum distribution of one-dimensional Bose and Fermi systems with long-range interaction for the ``special'' values , sin…