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Graphene and thin graphite films for ultrafast optical Kerr gating at 1 GHz repetition rate under focused illumination
Amr Farrag, Assegid M. Flatae, Mario Agio
https://arxiv.org/abs/2511.17713 https://arxiv.org/pdf/2511.17713 https://arxiv.org/html/2511.17713
arXiv:2511.17713v1 Announce Type: new
Abstract: The ability to address sub-picosecond events of weak optical signals is essential for progress in quantum science, nonlinear optics, and ultrafast spectroscopy. While up-conversion and optical Kerr gating (OKG) offer femtosecond resolution, they are generally limited to ensemble measurements, making ultrafast detection in nano-optics challenging. OKG, with its broadband response and high throughput without phase-matching, is especially promising when used at high repetition rates under focused illumination.
Here, we demonstrate an ultrafast detection scheme using the third-order nonlinearity of graphene and thin graphite films, operating at 1 GHz with sub-nanojoule pulses and achieving 141 fs temporal resolution. Their exceptionally large nonlinear refractive index, orders of magnitude higher than conventional Kerr media, enhances detection efficiency at smaller thicknesses, enables sub-picosecond response, and supports broadband operation. Their atomic-scale thickness minimizes dispersion and simplifies integration with microscopy platforms, optical fibers, and nanophotonic circuits, making them a compact, practical material platform for nano-optical and on-chip ultrafast Kerr gating.
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"if someone has taken a life through dangerous driving, we have to ask: why should they ever be allowed to drive again?"
Good question!
APPGCW and APPGTS asking the right questions and reaching the right answers.
https://road.cc/content/news/mps-warn-

MPs demand lifetime driving bans and stricter phone laws to address justice system "failing" families of those killed in collisions
"This report shines a light on the urgent need for reform. It's unacceptable that drivers who take lives through recklessness are allowed back on the roads while grieving families are left without a sense of justice"

A General Many-Body Perturbation Framework for Moir\'e Systems: Application to Rhombohedral Pentalayer Graphene/hBN Heterostructures
Xin Lu, Yuanfan Yang, Zhongqing Guo, Jianpeng Liu
https://arxiv.org/abs/2509.19764

A General Many-Body Perturbation Framework for Moiré Systems: Application to Rhombohedral Pentalayer Graphene/hBN Heterostructures
Moiré superlattices host a rich variety of correlated topological states, including interaction-driven integer and fractional Chern insulators. A common approach to study interacting ground states at integer fillings is the Hartree-Fock mean-field method. However, this method neglects dynamical correlations, which often leads to an overestimation of spontaneous symmetry breaking and fails to provide quantitative descriptions of single-particle excitations. This work introduces a general many-b…

Good Morning #Canada
Happy #Festivus everyone. I'm looking forward to the airing of grievances and performing feats of strength later today. But we also have to celebrate National Christmas Movie Marathon Day on December 23rd. Our pickings are slim if you want to limit yourself to Canadian classics of this holiday season. Sure, virtually every #Hallmak movie is filmed in Canada, apparently with variations of a single plot, but they don't count. Here's a list of 5 Canadian films provided by CBC to get you started and you can provide a community service by suggesting other titles for your fellow Canucks. For example, Uncle Buck feels like a Christmas movie solely because of John Candy. When your list is ready, you can wrap yourself in a Hudson's Bay blanket, munch on some Nanaimo Bars, and binge watch your favourites.
#CanadaIsAwesome #ChristmasMovie
https://www.cbc.ca/arts/have-yourself-a-canadiana-christmas-with-these-5-movies-1.3909749

Beyond Seamless: Unexpected Defective Merging in Single-Orientation Graphene
Zhien Wang, Jiangtao Wang, Diego Exposito, Andrey Krayev, Shih-Ming He, Xudong Zheng, Zachariah Hennighausen, Ivan Brihuega, Se-Young Jeong, Jing Kong
https://arxiv.org/abs/2509.21908

Beyond Seamless: Unexpected Defective Merging in Single-Orientation Graphene
Single-orientation stitching of graphene has emerged as the predominant method for growth of large-area, high-quality graphene films. Particularly noteworthy is graphene grown on single-crystalline Cu(111)/sapphire substrates, which exhibits exceptionally planar oriented stitching due to the atomically smooth substrate, facilitating the formation of continuous, high-quality graphene monolayer. These single-orientation stitches have conventionally been regarded as seamless with negligible defect…

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