AI Article Synopsis
- Time-resolved, angle-resolved photoemission spectroscopy (TR-ARPES) is a technique used to examine excitons within momentum space, providing insights into their behavior over time.
- The study introduces a time-domain GW approach to TR-ARPES, specifically applied to monolayer MoS, revealing that photoexcited excitons manifest as satellite bands that alter the quasiparticle bands.
- The research highlights the strong exciton-Floquet phenomenon induced by a time-dependent bosonic field, suggesting potential methods for engineering Floquet matter and modifying band structures in low-dimensional semiconductors.
Article Abstract
Time-resolved, angle-resolved photoemission spectroscopy (TR-ARPES) is a one-particle spectroscopic technique that can probe excitons (two-particle excitations) in momentum space. We present an ab initio, time-domain GW approach to TR-ARPES and apply it to monolayer MoS. We show that photoexcited excitons may be measured and quantified as satellite bands and lead to the renormalization of the quasiparticle bands. These features are explained in terms of an exciton-Floquet phenomenon induced by an exciton time-dependent bosonic field, which are orders of magnitude stronger than those of laser field-induced Floquet bands in low-dimensional semiconductors. Our findings imply a way to engineer Floquet matter through the coherent oscillation of excitons and open the new door for mechanisms for band structure engineering.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10410765 | PMC |
| http://dx.doi.org/10.1073/pnas.2301957120 | DOI Listing |
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