arXiv subjects

Rebecca Beyer

Publications and source records attributed to Rebecca Beyer.

4 recordsLinked to original sources

arXiv2025

Evaluating Software Supply Chain Security in Research Software

The security of research software is essential for ensuring the integrity and reproducibility of scientific results. However, research software security is still largely unexplored. Due to its dependence on open source components and distributed development practices, research software is particularly vulnerable to supply chain attacks. This study analyses 3,248 high-quality, largely peer-reviewed research software repositories using the OpenSSF Scorecard. We find a generally weak security posture with an average score of 3.5/10. Important practices, such as signed releases and branch protection, are rarely implemented. Finally, we present actionable, low-effort recommendations that can help research teams improve software security and mitigate potential threats to scientific integrity.

cs.SE↗

arXiv2017

Metal-Insulator Transition in the Dimerized Organic Conductor $κ$-(BEDT-TTF)$_2$Hg(SCN)$_2$Br

The organic charge-transfer salt $κ$-(BEDT-TTF)$_{2}$Hg(SCN)$_{2}$Br is a quasi two-dimensional metal with a half-filled conduction band at ambient conditions. When cooled below $T=80$ K it undergoes a pronounced transition to an insulating phase where the resistivity increases many orders of magnitude. In order to elucidate the nature of this metal-insulator transition we have performed comprehensive transport, dielectric and optical investigations. The findings are compared with other dimerized $κ$-(BEDT-TTF) salts, in particular the Cl-analogue, where a charge-order transition takes place at $T_{\rm CO}=30$ K.

cond-mat.str-el↗

arXiv2012

Search for quantum electronic dipoles in the dimerized κ-(BEDT-TTF)2Cu[N(CN)2]Cl salt

The Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl consists of molecular dimers arranged on an anisotropic triangular lattice and develops a canted antiferromagnetic ground state. It has recently been suggested that this system features purely electronic ferroelectricity which requires an electric dipole moment. Optical spectroscopy clearly rules out charge imbalance in this system, which excludes the existence of quantum electric dipoles on the dimers and subsequently a dipolar spin coupling. We suggest that the prominent in-plane dielectric response in κ-(BEDT-TTF)2Cu[N(CN)2]Cl is due to short-range discommensurations of the antiferromagnetic phase in the temperature range 30 < T < 50 K, and domain wall relaxations at lower temperatures.

cond-mat.str-el↗

arXiv2012

Absence of charge order in the dimerized κ-phase BEDT-TTF salts

Utilizing infrared vibrational spectroscopy we have investigated dimerized two-dimensional organic salts in order to search for possible charge redistribution that might cause electronic dipoles and ferroelectricity: the quantum spin liquid κ-(BEDT-TTF)2Cu2(CN)3, the antiferromagnetic Mott insulator κ-(BEDT-TTF)2$Cu[N(CN)2]Cl, and the superconductor κ-(BEDT-TTF)2$Cu[N(CN)2]Br. None of them exhibit any indication of charge disproportionation upon cooling down to low temperatures. No modification in the charge distribution is observed around T = 6 K where a low-temperature anomaly has been reported for the spin-liquid κ-(BEDT-TTF)2$Cu2(CN)3. In this compound the in-plane optical response and vibrational coupling are rather anisotropic, indicating that the tilt of the BEDT-TTF molecules in c-direction and their coupling to the anion layers has to be considered in the explanation of the electromagnetic properties.

cond-mat.str-el↗