3 papers
cond-mat.str-el1997
The Mott-Anderson transition in the disordered one-dimensional Hubbard model
Ramesh V. Pai, Alexander Punnoose, Rudolf A. Römer
We use the density matrix renormalization group to study the quantum transitions that occur in the half-filled one-dimensional fermionic Hubbard model with onsite potential disorde…
cond-mat1995
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…
cond-mat1995
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…