Fingerprints of Inelastic Transport at the Surface of the Topological Insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Role of Electron-Phonon Coupling

Costache, Marius V.; Neumann, Ingmar; Sierra, Juan F.; Marinova, Vera; Gospodinov, M.; Roche, Stephan; Valenzuela, Sergio O.

doi:10.1103/physrevlett.112.086601

Cited by 61 publications

(61 citation statements)

References 33 publications

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“…Hence they open new pathways for exciting and controlling lattice and electron dynamics simultaneously [131,[143][144][145]. Coherent phonon dynamics in topological insulators is also a subject of active research [146][147][148][149] where the electron-phonon coupling appears to set a limit on the natural spin polarized surface electrons transport [150,151]. Moreover, in magnetic materials, the interaction of acoustic phonons with spins opens the pathway for new functionalities.…”

Section: Coherent Phonon Sources: Electron-photon-phonon Interactionsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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Section: Coherent Phonon Sources: Electron-photon-phonon Interactionsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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“…23 In the experiment, it is observed that the current increases with the applied voltage in low voltage regime, then shows a tendency of saturation at the intermediate regime. However, the current saturation is not complete.…”

Section: -23mentioning

confidence: 93%

“…Therefore, when the applied voltage is higher than 50 mV, the carriers are excited from surface bands to the bulk band which has finite conductance. 23 However, this argument is valid only when the transport is nearly ballistic so that the carriers in the surface bands can have enough energy gain to be excited to the bulk bands. However, for the diffusive transport in the experimental setup, the average energy gain is estimated to be less than 4 meV when the applied voltage is 50 mV.…”

Section: -23mentioning

confidence: 99%

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High-field charge transport on the surface ofBi2Se3

Weng

2014

Phys. Rev. B

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We present a theoretical study on the high-field charge transport on the surface of Bi2Se3 and reproduce all the main features of the recent experimental results, i.e., the incomplete current saturation and the finite residual conductance in the high applied field regime [Costache et al., Phys. Rev. Lett. 112, 086601 (2014)]. Due to the hot-electron effect, the conductance decreases and the current shows the tendency of the saturation with the increase of the applied electric field. Moreover, the electric field can excite carriers within the surface bands through interband precession and leads to a higher conductance. As a joint effect of the hot-electron transport and the carrier excitation, the conductance approaches a finite residual value in the high-field regime and the current saturation becomes incomplete. We thus demonstrate that, contrary to the conjecture in the literature, the observed transport phenomena can be understood qualitatively in the framework of surface transport alone. Furthermore, if a constant bulk conductance which is insensitive to the field is introduced, one can obtain a good quantitative agreement between the theoretical results and the experimental data.

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“…Finally, the recent transport measurements of M.V. Costache et al 51 were interpreted with strong coupling to a single optical phonon mode of energy ∼ 8 meV.…”

Section: -8mentioning

confidence: 99%

Electron-phonon correlations on spin texture of gapped helical Dirac fermions

Ćarbotte

2015

Eur. Phys. J. B

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The metallic surface states of a topological insulator support helical Dirac fermions protected by topology with their spin locked perpendicular to their momentum. They can acquire mass through magnetic doping or through hybridization of states on opposite faces of a thin sample. In this case there can be a component of electron spin oriented perpendicular to the surface plane. The electronphonon interaction renormalizes the dynamics of the charge carriers through their spectral density. It also modifies the gap channel and a second spectral function enters which, not only determines the out of plane spin component, but also comes into in-plane properties. While the out of plane spin component is decreased below the Fermi momentum (kF ), the in plane component increases. There are also correlation tails extending well beyond kF . The angular resolved photo-emission line shapes aquire Holstein side bands. The effective gap in the density of states is reduced and the optical conductivity aquires distinct measurable phonon structure even for modest value of the electron-phonon coupling.

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Fingerprints of Inelastic Transport at the Surface of the Topological InsulatorBi2Se3: Role of Electron-Phonon Coupling

Cited by 61 publications

References 33 publications

Nanophononics: state of the art and perspectives

Nanophononics: state of the art and perspectives

High-field charge transport on the surface ofBi2Se3

Electron-phonon correlations on spin texture of gapped helical Dirac fermions

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