Tootfinder

Type-II Band Alignment in the ${\beta}$-Ga$_2$O$_3$/Rutile GeO$_2$ Heterojunction toward Solar-Blind Photodetection: A first-principles study
D. Q. Fang
https://arxiv.org/abs/2509.19948

Type-II Band Alignment in the $β$-Ga$_2$O$_3$/Rutile GeO$_2$ Heterojunction toward Solar-Blind Photodetection: A first-principles study
Semiconductor heterostructures capable of separating photogenerated electrons and holes have a wide range of optoelectronic applications, including photodetectors, solar cells, and photocatalysts. $β$-Ga$_2$O$_3$ and rutile GeO$_2$ are both ultrawide-bandgap semiconductors, with bandgaps of 4.85 eV and 4.68 eV, respectively. In this work, we employ first-principles calculations based on density functional theory to investigate the band alignment of the $β$-Ga$_2$O$_3$/rutile GeO$_2$ heterojun…

Detection of ferroic octupole ordering in $d$-wave altermagnetic rutile-type compounds
Masaichiro Mizumaki, Norimasa Sasabe, Takayuki Uozumi, Rikuto Oiwa, Hiroaki Kusunose
https://arxiv.org/abs/2509.14716

Detection of ferroic octupole ordering in $d$-wave altermagnetic rutile-type compounds
We propose that X-ray absorption and emission magnetic circular dichroism (XAS-MCD and XES-MCD) are promising measurements to directly detect ferroic higher-rank multipoles as candidate order parameters in altermagnets. Using the sum rules for XES-MCD and connecting them to multipole language, we demonstrate that the expectation value of the magnetic octupole moment is finite in the $d$-wave altermagnetic candidate rutile-type compounds TF$_2$ (T=transition metal). We also perform spectral calc…

Effects of strain on the stability of the metallic rutile and insulating M1 phases of vanadium dioxide
Peter Mlkvik, Lena Geistlich, Nicola A. Spaldin, Claude Ederer
https://arxiv.org/abs/2510.11480

Effects of strain on the stability of the metallic rutile and insulating M1 phases of vanadium dioxide
We present a systematic density-functional theory study of the effects of strain on the structural and electronic properties in vanadium dioxide (VO$_2$), with particular emphasis on its effect on the relative stability of the metallic rutile and the insulating monoclinic M1 phases. We consider various strain conditions that can be related to epitaxial strain present in VO$_2$ films grown on different lattice planes. Our calculations confirm the dominant role of $c$ axis strain, i.e., along the…

Adversarial Reinforcement Learning for Large Language Model Agent Safety
Zizhao Wang, Dingcheng Li, Vaishakh Keshava, Phillip Wallis, Ananth Balashankar, Peter Stone, Lukas Rutishauser
https://arxiv.org/abs/2510.05442

Adversarial Reinforcement Learning for Large Language Model Agent Safety
Large Language Model (LLM) agents can leverage tools such as Google Search to complete complex tasks. However, this tool usage introduces the risk of indirect prompt injections, where malicious instructions hidden in tool outputs can manipulate the agent, posing security risks like data leakage. Current defense strategies typically rely on fine-tuning LLM agents on datasets of known attacks. However, the generation of these datasets relies on manually crafted attack patterns, which limits their…

Så vad blev slutresultatet av 10,5 månaders vägning av plaståtervinning? Lyckades jag hålla målet på att återvinna 6 kg på helårsbasis, dvs hälften av vad svensken återvinner per år (13 kg)?
Tyvärr inte! Madrassförpackningarna spräckte det målet. Jag återvann 7 764 g beräknat på helår. Dvs 60 % av snittet. Jag är ändå ganska nöjd.
Lärdomen är att det är svårt att komma ner i en riktigt låg plastförbrukning i ett normalt hushåll. Det kräver omläggning av rutiner.

Strain-Induced Antiferromagnetic-to-Altermagnetic Phase Transition and Topology in $(\mathrm{CrO}_2)_1/(\mathrm{TaO}_2)_2$ Superlattice
Wanfei Shan, Qun Yang, Prineha Narang
https://arxiv.org/abs/2509.21741

Strain-Induced Antiferromagnetic-to-Altermagnetic Phase Transition and Topology in $(\mathrm{CrO}_2)_1/(\mathrm{TaO}_2)_2$ Superlattice
Topological aspects in altermagnets have come into focus recently, and tuning the antiferromagnetic (AFM) state into an altermagnetic phase remains an active frontier. We realize both within a rutile superlattice here in this paper. With first principles calculation, we show that a uniaxial strain of only 0.5$\%$ along the c axis converts the $(\mathrm{CrO}_2)_1/(\mathrm{TaO}_2)_2$ rutile superlattice from a trivial antiferromagnet into an altermagnet with topology accompanied by a weak SOC. Th…

Non-Altermagnetic Origin of Exchange Bias Behaviors in Incoherent RuO$_2$/Fe Bilayer Heterostructures
Shelby S. Fields, Joseph C. Prestigiacomo, Cory D. Cress, Nicholas G. Combs, Olaf van 't Erve, Patrick G. Callahan, Keith E. Knipling, Michelle E. Jamer, Frank M. Abel, Feng Ye, Arianna Minelli, Zachary J. Morgan, Haile Ambaye, Masaaki Matsuda, Avishek Maity, Valeria Lauter, Steven P. Bennett

Non-Altermagnetic Origin of Exchange Bias Behaviors in Incoherent RuO$_2$/Fe Bilayer Heterostructures
Initially identified as a promising altermagnetic (AM) candidate, rutile RuO$_2$ has since become embroiled in controversy due to contradictory findings of modeling and measurements of the magnetic properties of bulk crystals and thin films. For example, despite observations of a bulk non-magnetic state using density functional theory, neutron scattering, and muon spin resonance measurements, patterned RuO$_2$ Hall bars and film heterostructures display magnetotransport signatures of magnetic o…

Altermagnetic Shastry-Sutherland fullerene networks
Jiaqi Wu, Alaric Sanders, Rundong Yuan, Bo Peng
https://arxiv.org/abs/2508.21056 https://arxiv.org/pdf/…

Altermagnetic Shastry-Sutherland fullerene networks
Molecular building blocks provide a versatile platform for realising exotic quantum phases. Using charge neutral, pure carbon fullerene molecules as an example, we design altermagnetic C$_{40}$ monolayers in Shastry-Sutherland lattice. The resonance structure of one unpaired electron leads to an effective spin-1/2 cluster on both long sides of the molecule, which, after rotating into a 2D rutile-like crystal structure, forms altermagnetic ground state. We show $d$-wave spitting of the spin-pola…