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Non-linear photoconductivity of strongly driven graphene
by Lukas Broers, Ludwig Mathey
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Submission summary
| Authors (as registered SciPost users): | Lukas Broers |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2312.13217v3 (pdf) |
| Date accepted: | June 3, 2025 |
| Date submitted: | May 6, 2025, 4:05 a.m. |
| Submitted by: | Broers, Lukas |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
We present the non-linear DC photoconductivity of graphene under strong infra-red (IR) radiation. The photoconductivity is obtained as the response to a strong DC electric field, with field strengths outside of the linear-response regime, while the IR radiation is described by a strong AC electric field. The conductivity displays two distinct regimes in which either the DC or the AC field dominates. We explore these regimes and associate them with the dynamics of driven Landau-Zener quenches in the case of a large DC field. In the limit of large AC field, we describe the conductivity in a Floquet picture and compare the results to the closely related Tien-Gordon effect. We present analytical calculations for the non-linear differential photoconductivity, for both regimes based on the corresponding mechanisms. As part of this discussion of the non-equilibrium state of graphene, we present analytical estimates of the conductivity of undriven graphene as a function of temperature and DC bias field strength that show very good agreement with our simulations.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
List of changes
- Changed the notation of Eq. 1 and Eq. 3 to include the difference between both Dirac points
- Included clarifying remarks on the current contributions of the two Dirac points
- Included clarifying remark on the differential conductivities
- Included remark on the agreement of the non-linear conductivity with experimental measurements
Published as SciPost Phys. 18, 199 (2025)
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