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Peer-reviewedCC BYNanoscale advances

Coupled electro-mechanical response of Bi2Te3 nanowires probed by electron-beam excitation

  • Abhinav Srivastav1,2
  • Priyank Tripathi3,1
  • Reena Yadav3,1
  • Sahil Verma3,1
  • Ravita3,1
  • Mandeep Kaur1
  • Sudhir Husale3
  1. 1Council of Scientific and Industrial Research, National Physical Laboratory Dr K.S. Krishnan Marg New Delhi - 110012 India.
  2. 2Department of Physics, Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India.
  3. 3Academy of Scientific and Industrial Research (AcSIR) Ghaziabad-201002 India [email protected].
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Abstract

We investigate the electro-thermo-mechanical response of cantilevered nanowires using in situ scanning electron microscopy. Under low beam exposure, thermally driven vibrations manifest as image broadening near the free end, from which Young's moduli of ∼12.56-28.6 GPa are estimated. At higher beam currents, charging-induced forces drive forced oscillations, evidenced by non-Gaussian intensity profiles with enhanced turning-point probability. The spatial amplitude distribution along the nanowire reveals multimode excitation, indicating broadband driving by the electron beam beyond the fundamental mode. Prolonged irradiation additionally induces slow directional bending with an effective charging-relaxation time constant τ = 19.96 ± 0.27 s, consistent with a capacitive charging and leakage model. These findings demonstrate electron-beam-induced electro-mechanical coupling in Bi₂Te₃ nanowires and establish a contactless approach for probing nanomechanical response and charge-driven dynamics. Although Bi₂Te₃ is known to support topological surface states, the present measurements do not directly resolve surface-state transport; a possible contribution of surface states to charge redistribution therefore remains a material-specific interpretation that requires dedicated electronic measurements for confirmation.

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Cite

BibTeXRIS
BibTeX
@article{srivastav2026coupled,
  title = {{Coupled electro-mechanical response of Bi2Te3 nanowires probed by electron-beam excitation}},
  author = {Abhinav Srivastav and Priyank Tripathi and Reena Yadav and Sahil Verma and Ravita and Mandeep Kaur and Sudhir Husale},
  journal = {Nanoscale advances},
  year = {2026},
  month = oct,
  doi = {10.1039/d6na00841k},
  url = {https://europepmc.org/article/PMC/PMC13726101},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Coupled electro-mechanical response of Bi2Te3 nanowires probed by electron-beam excitation
AU  - Abhinav Srivastav
AU  - Priyank Tripathi
AU  - Reena Yadav
AU  - Sahil Verma
AU  - Ravita
AU  - Mandeep Kaur
AU  - Sudhir Husale
PY  - 2026
DA  - 2026/10/26
JO  - Nanoscale advances
DO  - 10.1039/d6na00841k
UR  - https://europepmc.org/article/PMC/PMC13726101
AB  - We investigate the electro-thermo-mechanical response of cantilevered nanowires using in situ scanning electron microscopy. Under low beam exposure, thermally driven vibrations manifest as image broadening near the free end, from which Young's moduli of ∼12.56-28.6 GPa are estimated. At higher beam currents, charging-induced forces drive forced oscillations, evidenced by non-Gaussian intensity profiles with enhanced turning-point probability. The spatial amplitude distribution along the nanowire reveals multimode excitation, indicating broadband driving by the electron beam beyond the fundamental mode. Prolonged irradiation additionally induces slow directional bending with an effective charging-relaxation time constant τ = 19.96 ± 0.27 s, consistent with a capacitive charging and leakage model. These findings demonstrate electron-beam-induced electro-mechanical coupling in Bi₂Te₃ nanowires and establish a contactless approach for probing nanomechanical response and charge-driven dynamics. Although Bi₂Te₃ is known to support topological surface states, the present measurements do not directly resolve surface-state transport; a possible contribution of surface states to charge redistribution therefore remains a material-specific interpretation that requires dedicated electronic measurements for confirmation.
SN  - 2516-0230
ER  -