October 6, 2025 – Kavli Institute Pre-Print Publications

Imaging Nanoscale Carrier, Thermal, and Structural Dynamics with Time-Resolved and Ultrafast Electron Energy-Loss Spectroscopy

Posted by klaurent October 6, 2025Caltech

Kavli Affiliate: Scott K. Cushing | Summary:Time-resolved and ultrafast electron energy-loss spectroscopy (EELS) is an emerging technique for measuring photoexcited carriers, lattice dynamics, and near-fields across femtosecond to microsecond timescales. When performed in either a specialized scanning transmission electron microscope or ultrafast electron microscope (UEM), time-resolved and ultrafast EELS can directly image charge carriers, lattice […]

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First X-ray and radio polarimetry of the neutron star low-mass X-ray binary GX 17+2

Posted by klaurent October 6, 2025MIT

Kavli Affiliate: Herman Marshall | Summary:We report the first polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 17+2 using the Imaging X-ray Polarimetry Explorer (IXPE) and the Very Large Array (VLA). We find that the X-ray source was polarized at PD = 1.9 +/- 0.3 % (1-sigma errors) with a […]

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First X-ray and radio polarimetry of the neutron star low-mass X-ray binary GX 17+2

Posted by klaurent October 6, 2025October 20, 2025MIT

Kavli Affiliate: Herman L. Marshall | First 5 Authors: Unnati Kashyap, Unnati Kashyap, , , | Summary: We report the first polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 17+2 using the Imaging X-ray Polarimetry Explorer (IXPE) and the Very Large Array (VLA). We find that the X-ray source was […]

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Tunable electronic energy level alignment and exciton diversity in organic-inorganic van der Waals heterostructures

Posted by klaurent October 6, 2025Berkeley

Kavli Affiliate: Jeffrey Neaton | Summary:van der Waals stacking of two-dimensional (2D) materials offers a powerful platform for engineering material interfaces with tailored electronic and optical properties. While most van der Waals multilayers have featured inorganic monolayers, incorporating molecular monolayers introduces new degrees of tunability and functionality. Here, we investigate hybrid bilayers composed of atomically […]

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Tunable electronic energy level alignment and exciton diversity in organic-inorganic van der Waals heterostructures

Posted by klaurent October 6, 2025October 20, 2025Berkeley

Kavli Affiliate: Jeffrey B. Neaton | First 5 Authors: Aurélie Champagne, Aurélie Champagne, , , | Summary: van der Waals stacking of two-dimensional (2D) materials offers a powerful platform for engineering material interfaces with tailored electronic and optical properties. While most van der Waals multilayers have featured inorganic monolayers, incorporating molecular monolayers introduces new degrees […]

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MEGATRON: how the first stars can create an iron metallicity plateau in the smallest dwarf galaxies

Posted by klaurent October 6, 2025Chicago

Kavli Affiliate: Alexander Ji | Summary:We study the stellar mass-iron metallicity relation of dwarf galaxies in the new high-resolution MEGATRON cosmological radiation-hydrodynamics simulations. These simulations model galaxy formation up to $zapprox8$ in a region that will collapse into a Milky-Way-like galaxy at $z=0$, while self-consistently tracking Population III and II (Pop.~III, Pop.~II) star formation, feedback […]

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MEGATRON: how the first stars create an iron metallicity plateau in the smallest dwarf galaxies

Posted by klaurent October 6, 2025October 20, 2025Chicago

Kavli Affiliate: Alexander P. Ji | First 5 Authors: Martin P. Rey, Martin P. Rey, , , | Summary: We study the stellar mass-iron metallicity relation of dwarf galaxies in the new high-resolution MEGATRON cosmological radiation-hydrodynamics simulations. These simulations model galaxy formation up to $zapprox8$ in a region that will collapse into a Milky-Way-like galaxy […]

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CMT-Benchmark: A Benchmark for Condensed Matter Theory Built by Expert Researchers

Posted by klaurent October 6, 2025Cornell

Kavli Affiliate: Debanjan Chowdhury | Summary:Large language models (LLMs) have shown remarkable progress in coding and math problem-solving, but evaluation on advanced research-level problems in hard sciences remains scarce. To fill this gap, we present CMT-Benchmark, a dataset of 50 problems covering condensed matter theory (CMT) at the level of an expert researcher. Topics span […]

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CMT-Benchmark: A Benchmark for Condensed Matter Theory Built by Expert Researchers

Posted by klaurent October 6, 2025Cornell

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EIGER VIII: First stars signatures in the connection between OI absorption and Galaxies in the Epoch of Reionization

Posted by klaurent October 6, 2025MIT

Kavli Affiliate: Robert Simcoe | Summary:We investigate the association between galaxies and neutral OI absorption systems at z~6, which trace metal-enriched gas during the epoch of reionization. We identify 40 galaxies across six quasar fields, residing in 15 overdensities within 300 kpc of the background sightlines. Five OI absorption systems are associated with five of […]

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