Ultrathin Topological Insulator Bi 2 Se 3 Nanoribbons Exfoliated by Atomic Force Microscopy

Seung Sae Hong; Worasom Kundhikanjana; Judy J. Cha; Keji Lai; Desheng Kong; Stefan Meister; Michael A. Kelly; Zhi-Xun Shen; Yi Cui

doi:10.1021/nl101884h

Ultrathin Topological Insulator Bi 2 Se 3 Nanoribbons Exfoliated by Atomic Force Microscopy

Seung Sae Hong, Worasom Kundhikanjana, Judy J. Cha, Keji Lai, Desheng Kong, Stefan Meister, Michael A. Kelly, Zhi-Xun Shen, Yi Cui

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Abstract

Ultrathin topological insulator nanostructures, in which coupling between top and bottom surface states takes place, are of great intellectual and practical importance. Due to the weak van der Waals interaction between adjacent quintuple layers (QLs), the layered bismuth selenide (Bi2Se 3), a single Dirac-cone topological insulator with a large bulk gap, can be exfoliated down to a few QLs. In this paper, we report the first controlled mechanical exfoliation of Bi2Se3 nanoribbons (>50 QLs) by an atomic force microscope (AFM) tip down to a single QL. Microwave impedance microscopy is employed to map out the local conductivity of such ultrathin nanoribbons, showing drastic difference in sheet resistance between 1-2 QLs and 4-5 QLs. Transport measurement carried out on an exfoliated (>5 QLs) Bi2Se3 device shows nonmetallic temperature dependence of resistance, in sharp contrast to the metallic behavior seen in thick (>50 QLs) ribbons. These AFM-exfoliated thin nanoribbons afford interesting candidates for studying the transition from quantum spin Hall surface to edge states. © 2010 American Chemical Society.

Original language	English (US)
Pages (from-to)	3118-3122
Number of pages	5
Journal	Nano Letters
Volume	10
Issue number	8
DOIs	https://doi.org/10.1021/nl101884h
State	Published - Aug 11 2010
Externally published	Yes

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@article{31a849f19a3b4bd99020bb58b6fb0269,

title = "Ultrathin Topological Insulator Bi 2 Se 3 Nanoribbons Exfoliated by Atomic Force Microscopy",

abstract = "Ultrathin topological insulator nanostructures, in which coupling between top and bottom surface states takes place, are of great intellectual and practical importance. Due to the weak van der Waals interaction between adjacent quintuple layers (QLs), the layered bismuth selenide (Bi2Se 3), a single Dirac-cone topological insulator with a large bulk gap, can be exfoliated down to a few QLs. In this paper, we report the first controlled mechanical exfoliation of Bi2Se3 nanoribbons (>50 QLs) by an atomic force microscope (AFM) tip down to a single QL. Microwave impedance microscopy is employed to map out the local conductivity of such ultrathin nanoribbons, showing drastic difference in sheet resistance between 1-2 QLs and 4-5 QLs. Transport measurement carried out on an exfoliated (>5 QLs) Bi2Se3 device shows nonmetallic temperature dependence of resistance, in sharp contrast to the metallic behavior seen in thick (>50 QLs) ribbons. These AFM-exfoliated thin nanoribbons afford interesting candidates for studying the transition from quantum spin Hall surface to edge states. {\textcopyright} 2010 American Chemical Society.",

author = "Hong, {Seung Sae} and Worasom Kundhikanjana and Cha, {Judy J.} and Keji Lai and Desheng Kong and Stefan Meister and Kelly, {Michael A.} and Zhi-Xun Shen and Yi Cui",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-11-001-12, KUS-FI-033-02 Acknowledgements: Y.C. acknowledges the support from the Keck Foundation. This work is also made possible by the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-11-001-12) and KAUST GRP Fellowship (No. KUS-FI-033-02), NSF Grant DMR-0906027, and Center of Probing the Nanoscale, Stanford University (NSF Grant PHY-0425897) This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2010",

month = aug,

day = "11",

doi = "10.1021/nl101884h",

language = "English (US)",

volume = "10",

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journal = "Nano Letters",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Ultrathin Topological Insulator Bi 2 Se 3 Nanoribbons Exfoliated by Atomic Force Microscopy

AU - Hong, Seung Sae

AU - Kundhikanjana, Worasom

AU - Cha, Judy J.

AU - Lai, Keji

AU - Kong, Desheng

AU - Meister, Stefan

AU - Kelly, Michael A.

AU - Shen, Zhi-Xun

AU - Cui, Yi

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-11-001-12, KUS-FI-033-02 Acknowledgements: Y.C. acknowledges the support from the Keck Foundation. This work is also made possible by the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-11-001-12) and KAUST GRP Fellowship (No. KUS-FI-033-02), NSF Grant DMR-0906027, and Center of Probing the Nanoscale, Stanford University (NSF Grant PHY-0425897) This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2010/8/11

Y1 - 2010/8/11

N2 - Ultrathin topological insulator nanostructures, in which coupling between top and bottom surface states takes place, are of great intellectual and practical importance. Due to the weak van der Waals interaction between adjacent quintuple layers (QLs), the layered bismuth selenide (Bi2Se 3), a single Dirac-cone topological insulator with a large bulk gap, can be exfoliated down to a few QLs. In this paper, we report the first controlled mechanical exfoliation of Bi2Se3 nanoribbons (>50 QLs) by an atomic force microscope (AFM) tip down to a single QL. Microwave impedance microscopy is employed to map out the local conductivity of such ultrathin nanoribbons, showing drastic difference in sheet resistance between 1-2 QLs and 4-5 QLs. Transport measurement carried out on an exfoliated (>5 QLs) Bi2Se3 device shows nonmetallic temperature dependence of resistance, in sharp contrast to the metallic behavior seen in thick (>50 QLs) ribbons. These AFM-exfoliated thin nanoribbons afford interesting candidates for studying the transition from quantum spin Hall surface to edge states. © 2010 American Chemical Society.

AB - Ultrathin topological insulator nanostructures, in which coupling between top and bottom surface states takes place, are of great intellectual and practical importance. Due to the weak van der Waals interaction between adjacent quintuple layers (QLs), the layered bismuth selenide (Bi2Se 3), a single Dirac-cone topological insulator with a large bulk gap, can be exfoliated down to a few QLs. In this paper, we report the first controlled mechanical exfoliation of Bi2Se3 nanoribbons (>50 QLs) by an atomic force microscope (AFM) tip down to a single QL. Microwave impedance microscopy is employed to map out the local conductivity of such ultrathin nanoribbons, showing drastic difference in sheet resistance between 1-2 QLs and 4-5 QLs. Transport measurement carried out on an exfoliated (>5 QLs) Bi2Se3 device shows nonmetallic temperature dependence of resistance, in sharp contrast to the metallic behavior seen in thick (>50 QLs) ribbons. These AFM-exfoliated thin nanoribbons afford interesting candidates for studying the transition from quantum spin Hall surface to edge states. © 2010 American Chemical Society.

UR - http://hdl.handle.net/10754/600121

UR - https://pubs.acs.org/doi/10.1021/nl101884h

UR - http://www.scopus.com/inward/record.url?scp=77955583809&partnerID=8YFLogxK

U2 - 10.1021/nl101884h

DO - 10.1021/nl101884h

M3 - Article

C2 - 20698625

SN - 1530-6984

VL - 10

SP - 3118

EP - 3122

JO - Nano Letters

JF - Nano Letters

IS - 8

ER -

Ultrathin Topological Insulator Bi 2 Se 3 Nanoribbons Exfoliated by Atomic Force Microscopy

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