Issue
EPL
Volume 86, Number 5, June 2009
Article Number 57006
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/57006
Published online 24 June 2009
EPL, 86 (2009) 57006
DOI: 10.1209/0295-5075/86/57006

Is spin-charge separation observable in a transport experiment?

Tobias Ulbricht1 and P. Schmitteckert2

1   Institut für Theorie der Kondensierten Materie, Universität Karlsruhe - 76128 Karlsruhe, Germany, EU
2   Institut für Nanotechnologie, Forschungszentrum Karlsruhe - 76021 Karlsruhe, Germany, EU

ulbricht@tkm.uni-karlsruhe.de

received 9 March 2009; accepted in final form 28 May 2009; published June 2009
published online 24 June 2009

Abstract
We consider a one-dimensional chain consisting of an interacting area coupled to non-interacting leads. Within the area, interaction is mediated by a local on-site repulsion. Using real-time evolution within the density matrix renormalisation group (DMRG) scheme, we study the dynamics of wave packets in this two-terminal transport setup. In contrast to previous works, where excitations were created by adding potentials to the Hamiltonian, we explicitly create left-moving single-particle excitations in the right lead as the starting condition. Our simulations show that such a transport setup allows for a clear detection of spin-charge separation using time-resolved spin-polarised density measurements.

PACS
71.10.Pm - Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.).
71.10.Fd - Lattice fermion models (Hubbard model, etc.).
72.15.Nj - Collective modes (e.g., in one-dimensional conductors).

© EPLA 2009