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arXiv · 1612.05597

Observation of spin-charge separation and boundary bound states via the local density of states

Benedikt Schoenauer·Peter Schmitteckert·Dirk Schuricht
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Abstract

We numerically calculate the local density of states (LDOS) of a one-dimensional Mott insulator with open boundaries, which is modelled microscopically by a (extended) Hubbard chain at half filling. In the Fourier transform of the LDOS we identify several dispersing features corresponding to propagating charge and spin degrees of freedom, thus providing a visualisation of the spin-charge separation in the system. We also consider the effect of an additional boundary potential, which, if sufficiently strong, leads to the formation of a boundary bound state which is clearly visible in the LDOS as a non-dispersing feature inside the Mott gap.

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Benedikt Schoenauer, Peter Schmitteckert, Dirk Schuricht. 2016-12-16. Observation of spin-charge separation and boundary bound states via the local density of states. https://doi.org/10.1103/physrevb.95.205103

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