Non-trivial topological spin-polarized surface states induced nonreciprocal transport in the hourglass semimetal
Abstract
Quantum materials such as topological semimetals have gained consummate interest due to their exotic band crossings and protected surface states. In particular, Ta3GeTe6 has emerged as a prototypical hourglass Dirac semimetal, as confirmed by both experimental and theoretical analysis. The ARPES confirms the topological hourglass-type band dispersions and Rashba-type band, while Hall measurements reveal a high hole carrier concentration and nonreciprocal transport behavior. These findings are further supported by a phenomenological toy model, which predicts a nonreciprocal resistance, consistent with the observed direction-dependent magnetoresistance. Furthermore, the Raman spectroscopy uncovers two-fold and four-fold phonon symmetries drag of highly anisotropic phonons, which establishes symmetry-dependent resistance. DFT calculations reveal Dirac-like and hourglass Dirac band crossings near the Fermi level for the bulk, with Rashba-type spin splitting induced by the surface inversion-symmetry breaking, leading to spin-polarized surface states. The combined experimental and theoretical results demonstrate that Ta3GeTe6 hosts a non-trivial electronic topology, with the inversion-symmetry breaking at the surface as the driver of this nonreciprocal transport behavior.
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BibTeX
@misc{muhammad2026nontrivial,
title = {{Non-trivial topological spin-polarized surface states induced nonreciprocal transport in the hourglass semimetal}},
author = {Zahir Muhammad and Ghulam Hussain and Zia ur Rehaman and Rajibul Islam and Igor Antoniazzi and Muhammad Ismail Khan and Carmine Autieri and Maciej R. Molas and Xiaoguang Li and Xiaoyang Lina Azizur Rahmana and Weisheng Zhaoa},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.09258},
eprint = {2611.09258},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.09258},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Non-trivial topological spin-polarized surface states induced nonreciprocal transport in the hourglass semimetal
AU - Zahir Muhammad
AU - Ghulam Hussain
AU - Zia ur Rehaman
AU - Rajibul Islam
AU - Igor Antoniazzi
AU - Muhammad Ismail Khan
AU - Carmine Autieri
AU - Maciej R. Molas
AU - Xiaoguang Li
AU - Xiaoyang Lina Azizur Rahmana
AU - Weisheng Zhaoa
PY - 2026
DA - 2026/11/06
PB - arXiv
DO - 10.48550/arxiv.2611.09258
UR - https://arxiv.org/abs/2611.09258
AB - Quantum materials such as topological semimetals have gained consummate interest due to their exotic band crossings and protected surface states. In particular, Ta_3GeTe_6 has emerged as a prototypical hourglass Dirac semimetal, as confirmed by both experimental and theoretical analysis. The ARPES confirms the topological hourglass-type band dispersions and Rashba-type band, while Hall measurements reveal a high hole carrier concentration and nonreciprocal transport behavior. These findings are further supported by a phenomenological toy model, which predicts a nonreciprocal resistance, consistent with the observed direction-dependent magnetoresistance. Furthermore, the Raman spectroscopy uncovers two-fold and four-fold phonon symmetries drag of highly anisotropic phonons, which establishes symmetry-dependent resistance. DFT calculations reveal Dirac-like and hourglass Dirac band crossings near the Fermi level for the bulk, with Rashba-type spin splitting induced by the surface inversion-symmetry breaking, leading to spin-polarized surface states. The combined experimental and theoretical results demonstrate that Ta_3GeTe_6 hosts a non-trivial electronic topology, with the inversion-symmetry breaking at the surface as the driver of this nonreciprocal transport behavior.
ER -