Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Transport: Topological Insulators - 2D
(Joint session of DS, HL, MA, O and TT organized by TT)

MA 7.10: Vortrag

Montag, 7. März 2016, 17:30–17:45, H18

Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices — •Giacomo Dolcetto^1,2, Matteo Carrega², Alessio Calzona^2,3, and Maura Sassetti^2,3 — ¹Physics and Materials Science Research Unit, University of Luxembourg, Luxembourg — ²SPIN-CNR, Genova, Italy — ³Dipartimento di Fisica, Università di Genova, Italy

Helical Luttinger liquids, appearing at the edge of two-dimensional topological insulators, represent a new paradigm of one-dimensional systems, where peculiar quantum phenomena can be investigated [1]. Motivated by recent experiments on charge fractionalization [2], we propose a setup based on helical Luttinger liquids that allows one to time-resolve, in addition to charge fractionalization, also spin-charge separation and pure spin fractionalization. This is due to the combined presence of spin-momentum locking and interactions. We show that electric time-resolved measurements can reveal both charge and spin properties, avoiding the need of magnetic materials [3, 4]. Although challenging, the proposed setup could be achieved with present-day technologies, promoting helical liquids as interesting playgrounds to explore the effects of interactions in one dimension.

[1] G. Dolcetto, M. Sassetti, and T. L. Schmidt,

arXiv preprint arXiv:1511.06141

[2] H. Kamata, N. Kumada, M. Hashisaka, K. Muraki,

and T. Fujisawa, Nat. Nanotechnol. 9, 177 (2014)

[3] A. Calzona, M. Carrega, G. Dolcetto, and M. Sassetti,

Physica E 74, 630 (2015)

[4] A. Calzona, M. Carrega, G. Dolcetto, and M. Sassetti,