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Peer-reviewedCC BY-NCScience Advances

Rashba-induced intersubband interference in high-harmonic generation

  • Hongbin Zhan1,2
  • Chen Qian1,3
  • Tong Wu1
  • Zekun Wang1
  • Kun Zhao1
  • Candong Liu2,4
  • Ya Bai2,4
  • Ruifeng Lu1
4 affiliations
  1. 1Institute of Ultrafast Optical Physics, Department of Applied Physics & MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China.
  2. 2State Key Laboratory of Ultra-intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
  3. 3Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China.
  4. 4Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
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Abstract

High-harmonic spectroscopy is exquisitely sensitive to the electronic structure and dynamics of quantum materials, yet quantum interference between spin-orbit-split bands has remained experimentally elusive. We observe this interference between Rashba-split bands in bismuth tellurium iodide (BiTeI) driven by strong mid-infrared laser fields. The sixth harmonic exhibits intensity-scaling kinks and an M-shaped ellipticity dependence. Theoretical simulations attribute these features to spin-orbit-mediated multichannel quantum interference, which arises from Landau-Zener-Stückelberg-type intersubband tunneling between Rashba-split bands. The suppression of harmonic yield under linearly polarized pulses arises from destructive interference among electron-hole recombination pathways, whereas increasing ellipticity modifies their relative phase and induces a distinct spectral redshift. These results establish high-harmonic spectroscopy as a probe of spin-textured band dynamics and ultrafast spin-polarized currents.

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Cite

BibTeXRIS
BibTeX
@article{zhan2026rashbainduced,
  title = {{Rashba-induced intersubband interference in high-harmonic generation}},
  author = {Hongbin Zhan and Chen Qian and Tong Wu and Zekun Wang and Kun Zhao and Candong Liu and Ya Bai and Ruifeng Lu},
  journal = {Science Advances},
  year = {2026},
  month = oct,
  doi = {10.1126/sciadv.aeh3388},
  url = {https://www.science.org/doi/abs/10.1126/sciadv.aeh3388},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Rashba-induced intersubband interference in high-harmonic generation
AU  - Hongbin Zhan
AU  - Chen Qian
AU  - Tong Wu
AU  - Zekun Wang
AU  - Kun Zhao
AU  - Candong Liu
AU  - Ya Bai
AU  - Ruifeng Lu
PY  - 2026
DA  - 2026/10/30
JO  - Science Advances
DO  - 10.1126/sciadv.aeh3388
UR  - https://www.science.org/doi/abs/10.1126/sciadv.aeh3388
AB  - High-harmonic spectroscopy is exquisitely sensitive to the electronic structure and dynamics of quantum materials, yet quantum interference between spin-orbit-split bands has remained experimentally elusive. We observe this interference between Rashba-split bands in bismuth tellurium iodide (BiTeI) driven by strong mid-infrared laser fields. The sixth harmonic exhibits intensity-scaling kinks and an M-shaped ellipticity dependence. Theoretical simulations attribute these features to spin-orbit-mediated multichannel quantum interference, which arises from Landau-Zener-Stückelberg-type intersubband tunneling between Rashba-split bands. The suppression of harmonic yield under linearly polarized pulses arises from destructive interference among electron-hole recombination pathways, whereas increasing ellipticity modifies their relative phase and induces a distinct spectral redshift. These results establish high-harmonic spectroscopy as a probe of spin-textured band dynamics and ultrafast spin-polarized currents.
SN  - 2375-2548
ER  -