Colloidal topological insulators
| Autor: | Johannes Loehr, Daniel de las Heras, Adam Jarosz, Maciej Urbaniak, Feliks Stobiecki, Andreea Tomita, Rico Huhnstock, Iris Koch, Arno Ehresmann, Dennis Holzinger, Thomas M. Fischer |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Condensed Matter::Quantum Gases
Condensed Matter::Soft Condensed Matter Condensed Matter - Mesoscale and Nanoscale Physics lcsh:QB460-466 Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Soft Condensed Matter (cond-mat.soft) FOS: Physical sciences Condensed Matter::Strongly Correlated Electrons lcsh:Astrophysics Condensed Matter - Soft Condensed Matter lcsh:Physics lcsh:QC1-999 |
| Zdroj: | Communications Physics, Vol 1, Iss 1, Pp 1-4 (2018) |
| Popis: | 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 new, robust, and versatile way of transporting colloidal particles, enabling new pathways towards lab on a chip applications. |
| Databáze: | OpenAIRE |
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