Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering

Anton Tamtogl; Patrick Kraus; Nadav Avidor; Martin Bremholm; Ellen M. J. Hedegaard; Bo B. Iversen; Marco Bianchi; Philip Hofmann; John Ellis; William Allison; Giorgio Benedek; Wolfgang E. Ernst

doi:10.1103/PhysRevB.95.195401

Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering

Anton Tamtogl^*
, Patrick Kraus
, Nadav Avidor
, Martin Bremholm
, Ellen M. J. Hedegaard
, Bo B. Iversen
, Marco Bianchi
, Philip Hofmann
, John Ellis
, William Allison
, Giorgio Benedek
, Wolfgang E. Ernst

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

49 Citationer (Scopus)

Abstract

We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling λ of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355K, we find λ to be in the range of 0.04-0.11. This method allows us to extract a correctly averaged λ and to address the discrepancy between previous studies. The relatively modest value of λ is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as ΘD=(81±6)K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9% of the lattice constant is obtained.

Originalsprog	Engelsk
Artikelnummer	195401
Tidsskrift	Physical Review B
Vol/bind	95
Nummer	19
Antal sider	9
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.95.195401
Status	Udgivet - 4 maj 2017

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10.1103/PhysRevB.95.195401

https://arxiv.org/pdf/1704.07416.pdf

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title = "Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering",

abstract = "We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling λ of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355K, we find λ to be in the range of 0.04-0.11. This method allows us to extract a correctly averaged λ and to address the discrepancy between previous studies. The relatively modest value of λ is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as ΘD=(81±6)K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9\% of the lattice constant is obtained.",

keywords = "WALLER FACTOR, TOPOLOGICAL INSULATORS, BISMUTH TELLURIDE, GAAS(110) SURFACE, METAL-SURFACES, DIFFRACTION, POTENTIALS, GENERATION, TRANSPORT, DYNAMICS",

author = "Anton Tamtogl and Patrick Kraus and Nadav Avidor and Martin Bremholm and Hedegaard, \{Ellen M. J.\} and Iversen, \{Bo B.\} and Marco Bianchi and Philip Hofmann and John Ellis and William Allison and Giorgio Benedek and Ernst, \{Wolfgang E.\}",

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T1 - Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering

AU - Tamtogl, Anton

AU - Kraus, Patrick

AU - Avidor, Nadav

AU - Bremholm, Martin

AU - Hedegaard, Ellen M. J.

AU - Iversen, Bo B.

AU - Bianchi, Marco

AU - Hofmann, Philip

AU - Ellis, John

AU - Allison, William

AU - Benedek, Giorgio

AU - Ernst, Wolfgang E.

PY - 2017/5/4

Y1 - 2017/5/4

N2 - We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling λ of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355K, we find λ to be in the range of 0.04-0.11. This method allows us to extract a correctly averaged λ and to address the discrepancy between previous studies. The relatively modest value of λ is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as ΘD=(81±6)K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9% of the lattice constant is obtained.

AB - We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling λ of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355K, we find λ to be in the range of 0.04-0.11. This method allows us to extract a correctly averaged λ and to address the discrepancy between previous studies. The relatively modest value of λ is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as ΘD=(81±6)K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9% of the lattice constant is obtained.

KW - WALLER FACTOR

KW - TOPOLOGICAL INSULATORS

KW - BISMUTH TELLURIDE

KW - GAAS(110) SURFACE

KW - METAL-SURFACES

KW - DIFFRACTION

KW - POTENTIALS

KW - GENERATION

KW - TRANSPORT

KW - DYNAMICS

UR - https://www.scopus.com/pages/publications/85024393319

U2 - 10.1103/PhysRevB.95.195401

DO - 10.1103/PhysRevB.95.195401

M3 - Journal article

SN - 2469-9950

VL - 95

JO - Physical Review B

JF - Physical Review B

IS - 19

M1 - 195401

ER -

Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering

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