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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.14100 |
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| _version_ | 1866908988648456192 |
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| author | Inacio, Guilherme J. Batista, Nathanael N. Spalenza, Wesley Belich, Humberto Palacios, Juan José Paz, Wendel S. |
| author_facet | Inacio, Guilherme J. Batista, Nathanael N. Spalenza, Wesley Belich, Humberto Palacios, Juan José Paz, Wendel S. |
| contents | We propose a methodology to detect weak Lorentz-violating (LV) backgrounds through the nonlinear shift photocurrent in noncentrosymmetric crystals. Using a spinful Rice--Mele model, we show that a LV background induces a momentum-odd correction to the Bloch Hamiltonian that reshapes the phase of the interband dipole matrix elements. As a result, the shift conductivity develops a robust $π$-periodic modulation as a function of the angle of a perpendicularly applied static electric field, in contrast to a weakly $2π$-periodic response of the Lorentz-symmetric case. This change in angular periodicity provides a signature of LV effects which can be directly identified through a photocurrent measurement. For realistic optical intensities, the predicted signal lies in the picoampere range, which can be enhanced in a matrix of weakly interacting chains, allowing sensitivity to LV coupling strengths of the order of $ξ\sim10^{-24}\,\mathrm{C\,m}$. These results establish nonlinear optical transport as a viable probe of emergent LV effects in solid-state systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14100 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Angular-resolved nonlinear optical response as a probe of Lorentz violation in noncentrosymmetric materials Inacio, Guilherme J. Batista, Nathanael N. Spalenza, Wesley Belich, Humberto Palacios, Juan José Paz, Wendel S. Mesoscale and Nanoscale Physics High Energy Physics - Phenomenology We propose a methodology to detect weak Lorentz-violating (LV) backgrounds through the nonlinear shift photocurrent in noncentrosymmetric crystals. Using a spinful Rice--Mele model, we show that a LV background induces a momentum-odd correction to the Bloch Hamiltonian that reshapes the phase of the interband dipole matrix elements. As a result, the shift conductivity develops a robust $π$-periodic modulation as a function of the angle of a perpendicularly applied static electric field, in contrast to a weakly $2π$-periodic response of the Lorentz-symmetric case. This change in angular periodicity provides a signature of LV effects which can be directly identified through a photocurrent measurement. For realistic optical intensities, the predicted signal lies in the picoampere range, which can be enhanced in a matrix of weakly interacting chains, allowing sensitivity to LV coupling strengths of the order of $ξ\sim10^{-24}\,\mathrm{C\,m}$. These results establish nonlinear optical transport as a viable probe of emergent LV effects in solid-state systems. |
| title | Angular-resolved nonlinear optical response as a probe of Lorentz violation in noncentrosymmetric materials |
| topic | Mesoscale and Nanoscale Physics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.14100 |