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Colloidal topological insulators

Title data

Löhr, Johannes ; de las Heras, Daniel ; Jarosz, Adam ; Urbaniak, Maciej ; Stobiecki, Feliks ; Tomita, Andreea ; Huhnstock, Rico ; Koch, Iris ; Ehresmann, Arno ; Holzinger, Dennis ; Fischer, Thomas M.:
Colloidal topological insulators.
In: Communications Physics. (22 February 2018) Issue 1 . - No. 4.
ISSN 2399-3650
DOI: https://doi.org/10.1038/s42005-017-0004-1

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Abstract in another language

Topological insulators insulate in the bulk but exhibit robust conducting edge states protected by the topology of the bulk material. Here, we design a colloidal topological insulator and demonstrate experimentally the occurrence of edge states in a classical particle system. Magnetic colloidal particles travel along the edge of two distinct magnetic lattices. We drive the colloids with a uniform external magnetic field that performs a topologically non-trivial modulation loop. The loop induces closed orbits in the bulk of the magnetic lattices. At the edge, where both lattices merge, the colloids perform skipping orbits trajectories and hence edge-transport. We also observe paramagnetic and diamagnetic colloids moving in opposite directions along the edge between two inverted patterns; the analogue of a quantum spin Hall effect in topological insulators. We present a robust and versatile way of transporting colloidal particles, enabling new pathways towards lab on a chip applications.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 530 Physics
Date Deposited: 25 Feb 2019 07:18
Last Modified: 27 Feb 2019 07:48
URI: https://eref.uni-bayreuth.de/id/eprint/47513