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Peer-reviewedCC BYNano letters

Ultrafast Laser-Induced Photothermoelectric Currents in Graphene Junctions in the Mid-Infrared.

  • Nina Pettinger1,2
  • Michel Panhans3
  • Johannes Schmuck1,2
  • Sebastian Loy1,2
  • Xiaoyi Zhou1,2
  • Chengye Dong4,5
  • J A Robinson4,5,6,7,8
  • Sergey Zherebtsov1,2
  • Christoph Kastl1,2
  • Frank Ortmann3
  • Alexander W Holleitner1,2
8 affiliations
  1. 1Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748Garching, Germany.
  2. 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799Munich, Germany.
  3. 3TUM School of Natural Sciences, Department of Chemistry and Atomistic Modeling Center, Munich Data Science Institute, Technical University of Munich, 85748Garching, Germany.
  4. 4Two-Dimensional Crystal Consortium, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
  5. 5Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
  6. 6Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
  7. 7Department of Physics, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
  8. 8Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
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Abstract

We investigate the carrier dynamics in graphene junctions under mid-infrared excitation using ultrafast pump-probe photocurrent spectroscopy. We utilize dual split gate devices to demonstrate that the photothermoelectric effect can dominate the photocurrent response of graphene also for a mid-infrared femtosecond excitation. Graphene retains its broadband photocurrent response in this spectral region, but the photocurrent relaxation time increases from ∼2 ps below 8-9 μm up to 3 ps at longer mid-infrared wavelengths. The absence of a pronounced phonon bottleneck in the decay dynamics at room temperature suggests an efficient interplay of electron-electron and electron-phonon scattering even for photon energies below the optical phonon energy in graphene. The observed wavelength dependence of the photocurrent relaxation times is consistent with energy-dependent theoretical relaxation times as derived from a microscopic transport theory of graphene that includes electron-phonon coupling within a Holstein-Peierls Hamiltonian.

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Cite

BibTeXRIS
BibTeX
@article{pettinger2026ultrafast,
  title = {{Ultrafast Laser-Induced Photothermoelectric Currents in Graphene Junctions in the Mid-Infrared.}},
  author = {Nina Pettinger and Michel Panhans and Johannes Schmuck and Sebastian Loy and Xiaoyi Zhou and Chengye Dong and J A Robinson and Sergey Zherebtsov and Christoph Kastl and Frank Ortmann and Alexander W Holleitner},
  journal = {Nano letters},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.nanolett.6c03809},
  url = {https://europepmc.org/article/MED/42917366},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Ultrafast Laser-Induced Photothermoelectric Currents in Graphene Junctions in the Mid-Infrared.
AU  - Nina Pettinger
AU  - Michel Panhans
AU  - Johannes Schmuck
AU  - Sebastian Loy
AU  - Xiaoyi Zhou
AU  - Chengye Dong
AU  - J A Robinson
AU  - Sergey Zherebtsov
AU  - Christoph Kastl
AU  - Frank Ortmann
AU  - Alexander W Holleitner
PY  - 2026
DA  - 2026/10/01
JO  - Nano letters
DO  - 10.1021/acs.nanolett.6c03809
UR  - https://europepmc.org/article/MED/42917366
AB  - We investigate the carrier dynamics in graphene junctions under mid-infrared excitation using ultrafast pump-probe photocurrent spectroscopy. We utilize dual split gate devices to demonstrate that the photothermoelectric effect can dominate the photocurrent response of graphene also for a mid-infrared femtosecond excitation. Graphene retains its broadband photocurrent response in this spectral region, but the photocurrent relaxation time increases from ∼2 ps below 8-9 μm up to 3 ps at longer mid-infrared wavelengths. The absence of a pronounced phonon bottleneck in the decay dynamics at room temperature suggests an efficient interplay of electron-electron and electron-phonon scattering even for photon energies below the optical phonon energy in graphene. The observed wavelength dependence of the photocurrent relaxation times is consistent with energy-dependent theoretical relaxation times as derived from a microscopic transport theory of graphene that includes electron-phonon coupling within a Holstein-Peierls Hamiltonian.
SN  - 1530-6984
SN  - 1530-6992
ER  -