Dominant Two-Dimensional Electron-Phonon Interactions in the Bulk Dirac Semimetal Na3Bi

Dhruv C. Desai; Jinsoo Park; Jin Jian Zhou; Marco Bernardi

doi:10.1021/acs.nanolett.3c00713

Dominant Two-Dimensional Electron-Phonon Interactions in the Bulk Dirac Semimetal Na₃Bi

Dhruv C. Desai, Jinsoo Park, Jin Jian Zhou, Marco Bernardi^*

^*Corresponding author for this work

School of Physics

California Institute of Technology

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

1 Citation (Scopus)

Abstract

Bulk Dirac semimetals (DSMs) exhibit unconventional transport properties and phase transitions due to their peculiar low-energy band structure, yet the electronic interactions governing nonequilibrium phenomena in DSMs are not fully understood. Here we show that electron-phonon (e-ph) interactions in a prototypical bulk DSM, Na₃Bi, are predominantly two-dimensional (2D). Our first-principles calculations reveal a 2D optical phonon with strong e-ph interactions associated with in-plane vibrations of Na atoms. We show that this 2D mode governs e-ph scattering and charge transport in Na₃Bi and induces a dynamical phase transition to a Weyl semimetal. Our work advances the quantitative analysis of electron interactions in Na₃Bi and reveals a dominant low-dimensional interaction in a bulk Dirac semimetal.

Original language	English
Pages (from-to)	3947-3953
Number of pages	7
Journal	Nano Letters
Volume	23
Issue number	9
DOIs	https://doi.org/10.1021/acs.nanolett.3c00713
Publication status	Published - 10 May 2023

Keywords

Dirac semimetal
electron−phonon coupling
first principles
phonon
two-dimensional

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10.1021/acs.nanolett.3c00713

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title = "Dominant Two-Dimensional Electron-Phonon Interactions in the Bulk Dirac Semimetal Na3Bi",

abstract = "Bulk Dirac semimetals (DSMs) exhibit unconventional transport properties and phase transitions due to their peculiar low-energy band structure, yet the electronic interactions governing nonequilibrium phenomena in DSMs are not fully understood. Here we show that electron-phonon (e-ph) interactions in a prototypical bulk DSM, Na3Bi, are predominantly two-dimensional (2D). Our first-principles calculations reveal a 2D optical phonon with strong e-ph interactions associated with in-plane vibrations of Na atoms. We show that this 2D mode governs e-ph scattering and charge transport in Na3Bi and induces a dynamical phase transition to a Weyl semimetal. Our work advances the quantitative analysis of electron interactions in Na3Bi and reveals a dominant low-dimensional interaction in a bulk Dirac semimetal.",

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author = "Desai, \{Dhruv C.\} and Jinsoo Park and Zhou, \{Jin Jian\} and Marco Bernardi",

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T1 - Dominant Two-Dimensional Electron-Phonon Interactions in the Bulk Dirac Semimetal Na3Bi

AU - Desai, Dhruv C.

AU - Park, Jinsoo

AU - Zhou, Jin Jian

AU - Bernardi, Marco

PY - 2023/5/10

Y1 - 2023/5/10

N2 - Bulk Dirac semimetals (DSMs) exhibit unconventional transport properties and phase transitions due to their peculiar low-energy band structure, yet the electronic interactions governing nonequilibrium phenomena in DSMs are not fully understood. Here we show that electron-phonon (e-ph) interactions in a prototypical bulk DSM, Na3Bi, are predominantly two-dimensional (2D). Our first-principles calculations reveal a 2D optical phonon with strong e-ph interactions associated with in-plane vibrations of Na atoms. We show that this 2D mode governs e-ph scattering and charge transport in Na3Bi and induces a dynamical phase transition to a Weyl semimetal. Our work advances the quantitative analysis of electron interactions in Na3Bi and reveals a dominant low-dimensional interaction in a bulk Dirac semimetal.

AB - Bulk Dirac semimetals (DSMs) exhibit unconventional transport properties and phase transitions due to their peculiar low-energy band structure, yet the electronic interactions governing nonequilibrium phenomena in DSMs are not fully understood. Here we show that electron-phonon (e-ph) interactions in a prototypical bulk DSM, Na3Bi, are predominantly two-dimensional (2D). Our first-principles calculations reveal a 2D optical phonon with strong e-ph interactions associated with in-plane vibrations of Na atoms. We show that this 2D mode governs e-ph scattering and charge transport in Na3Bi and induces a dynamical phase transition to a Weyl semimetal. Our work advances the quantitative analysis of electron interactions in Na3Bi and reveals a dominant low-dimensional interaction in a bulk Dirac semimetal.

KW - Dirac semimetal

KW - electron−phonon coupling

KW - first principles

KW - phonon

KW - two-dimensional

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JO - Nano Letters

JF - Nano Letters

IS - 9

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Dominant Two-Dimensional Electron-Phonon Interactions in the Bulk Dirac Semimetal Na₃Bi

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Keywords

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