Free-electron creation at the 60° twin boundary in Bi2Te3

Kwang Chon Kim, Joohwi Lee, Byung Kyu Kim, Won Young Choi, Hye Jung Chang, Sung Ok Won, Beomjin Kwon, Seong Keun Kim, Dow Bin Hyun, Hyun Jae Kim, Hyun Cheol Koo, Jung Hae Choi, Dong Ik Kim, Jin Sang Kim, Seung Hyub Baek

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Interfaces, such as grain boundaries in a solid material, are excellent regions to explore novel properties that emerge as the result of local symmetry-breaking. For instance, at the interface of a layered-chalcogenide material, the potential reconfiguration of the atoms at the boundaries can lead to a significant modification of the electronic properties because of their complex atomic bonding structure. Here, we report the experimental observation of an electron source at 60° twin boundaries in Bi 2 Te 3, a representative layered-chalcogenide material. First-principles calculations reveal that the modification of the interatomic distance at the 60° twin boundary to accommodate structural misfits can alter the electronic structure of Bi 2 Te 3. The change in the electronic structure generates occupied states within the original bandgap in a favourable condition to create carriers and enlarges the density-of-states near the conduction band minimum. The present work provides insight into the various transport behaviours of thermoelectrics and topological insulators.

Original languageEnglish
Article number12449
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Aug 16

Fingerprint

free electrons
Observation
Electrons
Electronic structure
electronic structure
Electron sources
electron sources
Conduction bands
Electronic properties
broken symmetry
conduction bands
Grain boundaries
Energy gap
grain boundaries
insulators
Atoms
electronics
atoms

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Kim, K. C., Lee, J., Kim, B. K., Choi, W. Y., Chang, H. J., Won, S. O., ... Baek, S. H. (2016). Free-electron creation at the 60° twin boundary in Bi2Te3. Nature communications, 7, [12449]. https://doi.org/10.1038/ncomms12449
Kim, Kwang Chon ; Lee, Joohwi ; Kim, Byung Kyu ; Choi, Won Young ; Chang, Hye Jung ; Won, Sung Ok ; Kwon, Beomjin ; Kim, Seong Keun ; Hyun, Dow Bin ; Kim, Hyun Jae ; Koo, Hyun Cheol ; Choi, Jung Hae ; Kim, Dong Ik ; Kim, Jin Sang ; Baek, Seung Hyub. / Free-electron creation at the 60° twin boundary in Bi2Te3. In: Nature communications. 2016 ; Vol. 7.
@article{eeb039caf17d4aa999724aff0649161c,
title = "Free-electron creation at the 60° twin boundary in Bi2Te3",
abstract = "Interfaces, such as grain boundaries in a solid material, are excellent regions to explore novel properties that emerge as the result of local symmetry-breaking. For instance, at the interface of a layered-chalcogenide material, the potential reconfiguration of the atoms at the boundaries can lead to a significant modification of the electronic properties because of their complex atomic bonding structure. Here, we report the experimental observation of an electron source at 60° twin boundaries in Bi 2 Te 3, a representative layered-chalcogenide material. First-principles calculations reveal that the modification of the interatomic distance at the 60° twin boundary to accommodate structural misfits can alter the electronic structure of Bi 2 Te 3. The change in the electronic structure generates occupied states within the original bandgap in a favourable condition to create carriers and enlarges the density-of-states near the conduction band minimum. The present work provides insight into the various transport behaviours of thermoelectrics and topological insulators.",
author = "Kim, {Kwang Chon} and Joohwi Lee and Kim, {Byung Kyu} and Choi, {Won Young} and Chang, {Hye Jung} and Won, {Sung Ok} and Beomjin Kwon and Kim, {Seong Keun} and Hyun, {Dow Bin} and Kim, {Hyun Jae} and Koo, {Hyun Cheol} and Choi, {Jung Hae} and Kim, {Dong Ik} and Kim, {Jin Sang} and Baek, {Seung Hyub}",
year = "2016",
month = "8",
day = "16",
doi = "10.1038/ncomms12449",
language = "English",
volume = "7",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",

}

Kim, KC, Lee, J, Kim, BK, Choi, WY, Chang, HJ, Won, SO, Kwon, B, Kim, SK, Hyun, DB, Kim, HJ, Koo, HC, Choi, JH, Kim, DI, Kim, JS & Baek, SH 2016, 'Free-electron creation at the 60° twin boundary in Bi2Te3', Nature communications, vol. 7, 12449. https://doi.org/10.1038/ncomms12449

Free-electron creation at the 60° twin boundary in Bi2Te3. / Kim, Kwang Chon; Lee, Joohwi; Kim, Byung Kyu; Choi, Won Young; Chang, Hye Jung; Won, Sung Ok; Kwon, Beomjin; Kim, Seong Keun; Hyun, Dow Bin; Kim, Hyun Jae; Koo, Hyun Cheol; Choi, Jung Hae; Kim, Dong Ik; Kim, Jin Sang; Baek, Seung Hyub.

In: Nature communications, Vol. 7, 12449, 16.08.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Free-electron creation at the 60° twin boundary in Bi2Te3

AU - Kim, Kwang Chon

AU - Lee, Joohwi

AU - Kim, Byung Kyu

AU - Choi, Won Young

AU - Chang, Hye Jung

AU - Won, Sung Ok

AU - Kwon, Beomjin

AU - Kim, Seong Keun

AU - Hyun, Dow Bin

AU - Kim, Hyun Jae

AU - Koo, Hyun Cheol

AU - Choi, Jung Hae

AU - Kim, Dong Ik

AU - Kim, Jin Sang

AU - Baek, Seung Hyub

PY - 2016/8/16

Y1 - 2016/8/16

N2 - Interfaces, such as grain boundaries in a solid material, are excellent regions to explore novel properties that emerge as the result of local symmetry-breaking. For instance, at the interface of a layered-chalcogenide material, the potential reconfiguration of the atoms at the boundaries can lead to a significant modification of the electronic properties because of their complex atomic bonding structure. Here, we report the experimental observation of an electron source at 60° twin boundaries in Bi 2 Te 3, a representative layered-chalcogenide material. First-principles calculations reveal that the modification of the interatomic distance at the 60° twin boundary to accommodate structural misfits can alter the electronic structure of Bi 2 Te 3. The change in the electronic structure generates occupied states within the original bandgap in a favourable condition to create carriers and enlarges the density-of-states near the conduction band minimum. The present work provides insight into the various transport behaviours of thermoelectrics and topological insulators.

AB - Interfaces, such as grain boundaries in a solid material, are excellent regions to explore novel properties that emerge as the result of local symmetry-breaking. For instance, at the interface of a layered-chalcogenide material, the potential reconfiguration of the atoms at the boundaries can lead to a significant modification of the electronic properties because of their complex atomic bonding structure. Here, we report the experimental observation of an electron source at 60° twin boundaries in Bi 2 Te 3, a representative layered-chalcogenide material. First-principles calculations reveal that the modification of the interatomic distance at the 60° twin boundary to accommodate structural misfits can alter the electronic structure of Bi 2 Te 3. The change in the electronic structure generates occupied states within the original bandgap in a favourable condition to create carriers and enlarges the density-of-states near the conduction band minimum. The present work provides insight into the various transport behaviours of thermoelectrics and topological insulators.

UR - http://www.scopus.com/inward/record.url?scp=84982112299&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84982112299&partnerID=8YFLogxK

U2 - 10.1038/ncomms12449

DO - 10.1038/ncomms12449

M3 - Article

AN - SCOPUS:84982112299

VL - 7

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 12449

ER -

Kim KC, Lee J, Kim BK, Choi WY, Chang HJ, Won SO et al. Free-electron creation at the 60° twin boundary in Bi2Te3. Nature communications. 2016 Aug 16;7. 12449. https://doi.org/10.1038/ncomms12449