AI Article Synopsis
- The DC photocurrent can identify the topology and geometry of quantum materials lacking inversion symmetry, and we propose using DC shot noise (DSN) as a diagnostic tool for these materials.
- We have developed a quantum theory for analyzing DSNs in gapped systems, separating the second-order photocurrent into distinct contributions to understand their characteristics.
- Our findings reveal that while DSNs are unaffected by inversion symmetry, time-reversal symmetry influence varies depending on light polarization, and we successfully apply our theory to evaluate DSNs in monolayer GeS and bilayer MoS, finding larger DSNs in centrosymmetric phases.
Article Abstract
The DC photocurrent can detect the topology and geometry of quantum materials without inversion symmetry. Herein, we propose that the DC shot noise (DSN), as the fluctuation of photocurrent operator, can also be a diagnostic of quantum materials. Particularly, we develop the quantum theory for DSNs in gapped systems and identify the shift and injection DSNs by dividing the second-order photocurrent operator into off-diagonal and diagonal contributions, respectively. Remarkably, we find that the DSNs can not be forbidden by inversion symmetry, while the constraint from time-reversal symmetry depends on the polarization of light. Furthermore, we show that the DSNs also encode the geometrical information of Bloch electrons, such as the Berry curvature and the quantum metric. Finally, guided by symmetry, we apply our theory to evaluate the DSNs in monolayer GeS and bilayer MoS with and without inversion symmetry and find that the DSNs can be larger in centrosymmetric phase.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10914713 | PMC |
| http://dx.doi.org/10.1038/s41467-024-46264-1 | DOI Listing |
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