63 citations · 142 across the 5 of their papers we have counts for
5 papers
Optical conductivity of a Hubbard ring with an impurity
Cosima Schuster, Philipp Brune
We investigate the optical conductivity of a Hubbard ring in presence of an impurity by means of exact diagonalization using the Lanczos algorithm. We concentrate thereby on the fi…
Disorder-induced enhancement of the persistent current for strongly interacting electrons in one-dimensional rings
Elise Gambetti-Césare, Dietmar Weinmann, Rodolfo A. Jalabert +1
We show that disorder increases the persistent current of a half-filled one-dimensional Hubbard-Anderson ring at strong interaction. This unexpected effect results from a perturbat…
Cyclic Spin Exchange in Cuprate Spin Ladders
Tamara S. Nunner, Philipp Brune, Thilo Kopp +2
We investigate the influence of a cyclic spin exchange J_{cyc} on the one- and two-triplet excitations of an undoped two-leg S=1/2 ladder, using the density matrix renormalization…
Phase diagram and optical conductivity of the ionic Hubbard model
P. Brune, G. I. Japaridze, A. P. Kampf +1
We investigate the ground state phase diagram of the one-dimensional ionic Hubbard model with an alternating potential at half-filling by the bosonization technique as well as by n…
Photon-Assisted Transport Through Ultrasmall Quantum Dots: Influence of Intradot Transitions
Ph. Brune, C. Bruder, H. Schoeller
We study transport through one or two ultrasmall quantum dots with discrete energy levels to which a time-dependent field is applied (e.g., microwaves). The AC field causes photon-…