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TT: Fachverband Tiefe Temperaturen

TT 10: Nanotubes and Nanoribbons

TT 10.4: Vortrag

Montag, 16. März 2020, 12:15–12:30, HSZ 204

Spin-Orbit Coupling modulations near edges: emergence of massive edge states — •Tineke L. van den Berg¹, M. Reyes Calvo², Alessandro De Martino³, and Dario Bercioux^1,4 — ¹Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 San Sebastián, Spain — ²Departamento de Fisica Aplicada, Universidad de Alicante, 03690 Alicante, Spain — ³Department of Mathematics, City, University of London, London EC1V 0HB, United Kingdom — ⁴IKERBASQUE, Basque Foundation of Science, E-48011 Bilbao, Spain

In topological two-dimensional systems, gap modification near system edges, can lead to the appearance of massive edge states, as we have shown in earlier work [1]. In graphene, it is the Kane-Mele Spin-Orbit Coupling (SOC) that leads to the opening of a topological gap [2]. Here we will deal with systems subject to inhomogeneous SOC. In zigzag nanoribbons, smooth spatial modification of SOC near the edges results in in-gap massive edge states at the K and K′ points. In armchair nanoribbons, such massive states appear at the Γ point. We analyse the properties of these states, and propose how to measure and tune them [3].

[1] C. L. Kane and E. J. Mele, PRL. 95, 226801 (2005).

[2] T. L. van den Berg, M. R. Calvo and D. Bercioux, arXiv:1911.09363.

[3] T. L. van den Berg et al. in preparation