Nanoscale surface dynamics of Bi2Te3(111): observation of a prominent surface acoustic wave and the role of van der Waals interactions

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Nanoscale surface dynamics of Bi2Te3(111) : observation of a prominent surface acoustic wave and the role of van der Waals interactions. / Tamtoegl, Anton; Campi, Davide; Bremholm, Martin; Hedegaard, Ellen M. J.; Iversen, Bo B.; Bianchi, Marco; Hofmann, Philip; Marzari, Nicola; Benedek, Giorgio; Ellis, John; Allison, William.

In: Nanoscale, Vol. 10, No. 30, 14.08.2018, p. 14627-14636.

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Tamtoegl, Anton ; Campi, Davide ; Bremholm, Martin ; Hedegaard, Ellen M. J. ; Iversen, Bo B. ; Bianchi, Marco ; Hofmann, Philip ; Marzari, Nicola ; Benedek, Giorgio ; Ellis, John ; Allison, William. / Nanoscale surface dynamics of Bi2Te3(111) : observation of a prominent surface acoustic wave and the role of van der Waals interactions. In: Nanoscale. 2018 ; Vol. 10, No. 30. pp. 14627-14636.

Bibtex

@article{03ecf22f33b442b780f7d90d3da8a707,
title = "Nanoscale surface dynamics of Bi2Te3(111): observation of a prominent surface acoustic wave and the role of van der Waals interactions",
abstract = "We present a combined experimental and theoretical study of the surface vibrational modes of the topological insulator Bi2Te3. Using high-resolution helium-3 spin-echo spectroscopy we are able to resolve the acoustic phonon modes of Bi2Te3(111). The low energy region of the lattice vibrations is mainly dominated by the Rayleigh mode which has been claimed to be absent in previous experimental studies. The appearance of the Rayleigh mode is consistent with previous bulk lattice dynamics studies as well as theoretical predictions of the surface phonon modes. Density functional perturbation theory calculations including van der Waals corrections are in excellent agreement with the experimental data. Comparison of the experimental results with theoretically obtained values for films with a thickness of several layers further demonstrate, that for an accurate theoretical description of three-dimensional topological insulators with their layered structure the inclusion of van der Waals corrections is essential. The presence of a prominent surface acoustic wave and the contribution of van der Waals bonding to the lattice dynamics may hold important implications for the thermoelectric properties of thin-film and nanoscale devices.",
keywords = "HELIUM ATOM SCATTERING, TOPOLOGICAL INSULATOR, LATTICE-VIBRATIONS, RAMAN, PHONONS, DENSITY, FILMS",
author = "Anton Tamtoegl and Davide Campi and Martin Bremholm and Hedegaard, {Ellen M. J.} and Iversen, {Bo B.} and Marco Bianchi and Philip Hofmann and Nicola Marzari and Giorgio Benedek and John Ellis and William Allison",
year = "2018",
month = "8",
day = "14",
doi = "10.1039/c8nr03102a",
language = "English",
volume = "10",
pages = "14627--14636",
journal = "Nanoscale",
issn = "2040-3364",
publisher = "ROYAL SOC CHEMISTRY",
number = "30",

}

RIS

TY - JOUR

T1 - Nanoscale surface dynamics of Bi2Te3(111)

T2 - observation of a prominent surface acoustic wave and the role of van der Waals interactions

AU - Tamtoegl, Anton

AU - Campi, Davide

AU - Bremholm, Martin

AU - Hedegaard, Ellen M. J.

AU - Iversen, Bo B.

AU - Bianchi, Marco

AU - Hofmann, Philip

AU - Marzari, Nicola

AU - Benedek, Giorgio

AU - Ellis, John

AU - Allison, William

PY - 2018/8/14

Y1 - 2018/8/14

N2 - We present a combined experimental and theoretical study of the surface vibrational modes of the topological insulator Bi2Te3. Using high-resolution helium-3 spin-echo spectroscopy we are able to resolve the acoustic phonon modes of Bi2Te3(111). The low energy region of the lattice vibrations is mainly dominated by the Rayleigh mode which has been claimed to be absent in previous experimental studies. The appearance of the Rayleigh mode is consistent with previous bulk lattice dynamics studies as well as theoretical predictions of the surface phonon modes. Density functional perturbation theory calculations including van der Waals corrections are in excellent agreement with the experimental data. Comparison of the experimental results with theoretically obtained values for films with a thickness of several layers further demonstrate, that for an accurate theoretical description of three-dimensional topological insulators with their layered structure the inclusion of van der Waals corrections is essential. The presence of a prominent surface acoustic wave and the contribution of van der Waals bonding to the lattice dynamics may hold important implications for the thermoelectric properties of thin-film and nanoscale devices.

AB - We present a combined experimental and theoretical study of the surface vibrational modes of the topological insulator Bi2Te3. Using high-resolution helium-3 spin-echo spectroscopy we are able to resolve the acoustic phonon modes of Bi2Te3(111). The low energy region of the lattice vibrations is mainly dominated by the Rayleigh mode which has been claimed to be absent in previous experimental studies. The appearance of the Rayleigh mode is consistent with previous bulk lattice dynamics studies as well as theoretical predictions of the surface phonon modes. Density functional perturbation theory calculations including van der Waals corrections are in excellent agreement with the experimental data. Comparison of the experimental results with theoretically obtained values for films with a thickness of several layers further demonstrate, that for an accurate theoretical description of three-dimensional topological insulators with their layered structure the inclusion of van der Waals corrections is essential. The presence of a prominent surface acoustic wave and the contribution of van der Waals bonding to the lattice dynamics may hold important implications for the thermoelectric properties of thin-film and nanoscale devices.

KW - HELIUM ATOM SCATTERING

KW - TOPOLOGICAL INSULATOR

KW - LATTICE-VIBRATIONS

KW - RAMAN

KW - PHONONS

KW - DENSITY

KW - FILMS

U2 - 10.1039/c8nr03102a

DO - 10.1039/c8nr03102a

M3 - Journal article

VL - 10

SP - 14627

EP - 14636

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

IS - 30

ER -