Characterization of the Edge States in Colloidal Bi2Se3 Platelets

Jesper R. Moes; Jara F. Vliem; Pedro Monteiro Campos de Melo; Thomas C. Wigmans; Andrés R. Botello-Méndez; Rafael G. Mendes; Ella F. van Brenk; Ingmar Swart; Lucas Maisel Licerán; Henk Stoof; Christophe Delerue; Zeila Zanolli; Daniel Vanmaekelbergh

doi:10.1021/acs.nanolett.3c04460

Characterization of the Edge States in Colloidal Bi₂Se₃ Platelets

Jesper R. Moes, Jara F. Vliem, Pedro Monteiro Campos de Melo, Thomas C. Wigmans, Andrés R. Botello-Méndez, Rafael G. Mendes, Ella F. van Brenk, Ingmar Swart, Lucas Maisel Licerán, Henk Stoof, Christophe Delerue, Zeila Zanolli, Daniel Vanmaekelbergh^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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.

Original language	English
Pages (from-to)	5110–5116
Number of pages	7
Journal	Nano Letters
Volume	24
Issue number	17
Early online date	16 Apr 2024
DOIs	https://doi.org/10.1021/acs.nanolett.3c04460
Publication status	Published - May 2024

Keywords

Bismuth selenide nanoplatelets
Density functional theory
Edge state
Quantum spin Hall insulator
Scanning tunneling spectroscopy
Topological insulator

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Cite this

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title = "Characterization of the Edge States in Colloidal Bi2Se3 Platelets",

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",

author = "Moes, {Jesper R.} and Vliem, {Jara F.} and {Monteiro Campos de Melo}, Pedro and Wigmans, {Thomas C.} and Botello-M{\'e}ndez, {Andr{\'e}s R.} and Mendes, {Rafael G.} and Brenk, {Ella F. van} and Ingmar Swart and Licer{\'a}n, {Lucas Maisel} and Henk Stoof and Christophe Delerue and Zeila Zanolli and Daniel Vanmaekelbergh",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors. Published by American Chemical Society.",

year = "2024",

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doi = "10.1021/acs.nanolett.3c04460",

language = "English",

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T1 - Characterization of the Edge States in Colloidal Bi2Se3 Platelets

AU - Moes, Jesper R.

AU - Vliem, Jara F.

AU - Monteiro Campos de Melo, Pedro

AU - Wigmans, Thomas C.

AU - Botello-Méndez, Andrés R.

AU - Mendes, Rafael G.

AU - Brenk, Ella F. van

AU - Swart, Ingmar

AU - Licerán, Lucas Maisel

AU - Stoof, Henk

AU - Delerue, Christophe

AU - Zanolli, Zeila

AU - Vanmaekelbergh, Daniel

PY - 2024/5

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AB - 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.

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KW - Density functional theory

KW - Edge state

KW - Quantum spin Hall insulator

KW - Scanning tunneling spectroscopy

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