Characterization of the Edge States in Colloidal Bi2Se3 Platelets
Publication date
2024-05
Authors
Moes, Jesper René
Vliem, Jara Feline
Monteiro Campos de Melo, Pedro
Wigmans, Thomas C.
Botello-Méndez, Andrés R.
Mendes, Rafael G.
Brenk, Ella F. van
Swart, Ingmar
Licerán, L. Maisel
Stoof, Henk
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Advisors
Supervisors
Document Type
Article
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Abstract
The remarkable development of colloidal nanocrystals with controlled dimensions and surface chemistry has resulted in vast optoelectronic applications. But can they also form a platform for quantum materials, in which electronic coherence is key? Here, we use colloidal, two-dimensional Bi2Se3 crystals, with precise and uniform thickness and finite lateral dimensions in the 100 nm range, to study the evolution of a topological insulator from three to two dimensions. For a thickness of 4–6 quintuple layers, scanning tunneling spectroscopy shows an 8 nm wide, nonscattering state encircling the platelet. We discuss the nature of this edge state with a low-energy continuum model and ab initio GW-Tight Binding theory. Our results also provide an indication of the maximum density of such states on a device.
Keywords
Bismuth selenide nanoplatelets, Density functional theory, Edge state, Quantum spin Hall insulator, Scanning tunneling spectroscopy, Topological insulator, General Chemistry, Condensed Matter Physics, Mechanical Engineering, Bioengineering, General Materials Science
Citation
Moes, J R, Vliem, J F, Monteiro Campos de Melo, P, Wigmans, T C, Botello-Méndez, A R, Mendes, R G, Brenk, E F V, Swart, I, Licerán, L M, Stoof, H, Delerue, C, Zanolli, Z & Vanmaekelbergh, D 2024, 'Characterization of the Edge States in Colloidal Bi 2 Se 3 Platelets', Nano Letters, vol. 24, no. 17, pp. 5110–5116. https://doi.org/10.1021/acs.nanolett.3c04460