Impurities in a Hubbard-chain View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2002

AUTHORS

Cosima Schuster , Philipp Brune , Ulrich Eckern

ABSTRACT

Using the density matrix renormalization group method we study the quantum coherence of one-dimensional interacting Fermi systems. We investigate the the effects of several kinds of impurities on the ground-state of a Hubbard chain in detail. Thereby we look at the transition from a metallic to an insulating ground-state caused by a local potential, a locally modified interaction or hopping. Unfortunately the preliminary results show that the successful treatment of a system of interacting spinless fermions, using the phase sensitivity as the observable of the phase transition, is unsuitable in the disordered Hubbard-chain. Nevertheless the data lead to new insight in the level structure. The investigation of the optical conductivity is still in progress. In addition we determine the exponent of the algebraic decay of Friedel oscillations at the boundary and around an impurity in the middle of the chain. These results are very useful for the characterization of the above mentioned impurities. More... »

PAGES

157-166

Book

TITLE

High Performance Computing in Science and Engineering ’01

ISBN

978-3-642-62719-4
978-3-642-56034-7

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-642-56034-7_14

DOI

http://dx.doi.org/10.1007/978-3-642-56034-7_14

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018111544


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