Kavli Affiliate: Joseph Falson | Summary:We report molecular beam epitaxy synthesis of vacancy-ordered rocksalt NbO thin films which display superconductivity. A comparative study of substrates identifies Al$_2$O$_3$ (0001) as the optimal platform for realizing high-quality, single-phase films when growing at temperatures exceeding 1000 $^circ$C. The controlled NbO films exhibit superconductivity with critical temperatures up to […]
Kavli Affiliate: Nelson Darkwah Oppong| Summary:We propose quantum simulation experiments of the Kondo impurity problem using cold alkaline-earth(-like) atoms (AEAs) in a combination of optical lattice and optical tweezer potentials. Within an ab initio model for atomic interactions in the optical potentials, we analyze hallmark signatures of the Kondo effect in a variety of observables […]
Kavli Affiliate: Joseph Falson | Summary:Deterministic control of the layering configuration of two-dimensional quantum materials plays a central role in studying their emergent electronic properties. Here we demonstrate in-situ control over competing stacking configurations in thin film crystals of the rare-earth diantimonides by synthesizing in proximity to competing structural orders. A crossover between the epitaxially […]
Kavli Affiliate: David Hsieh| Summary:The undoped antiferromagnetic Mott insulator naturally has one charge carrier per lattice site. When it is doped with additional carriers, they are unstable to spin fluctuation-mediated Cooper pairing as well as other unconventional types of charge, spin, and orbital current ordering. Photo-excitation can produce charge carriers in the form of empty […]
Kavli Affiliate: David Hsieh| Summary:Two-dimensional Mott insulators host antiferromagnetic (AFM) correlations that are predicted to enhance the attractive interaction between empty (holons) and doubly occupied (doublons) sites, creating a novel pathway for exciton formation. However, experimental confirmation of this spin-mediated binding mechanism remains elusive. Leveraging the distinct magnetic critical properties of the Mott antiferromagnets Sr$_2$IrO$_4$ […]
Kavli Affiliate: Michael Roukes | Summary:We describe a method with which to fabricate sub-micron mechanical structures from silicon-on-insulator substrates. We believe this is the first reported method for such fabrication, and our technique allows for complex, multilayer electron beam lithography to define metallized layers and structural Si layers on these substrates. The insulating underlayer may […]
Kavli Affiliate: Harry Atwater | Summary:We report a scalable approach for fabricating single-crystal barium titanate (BTO) thin films through spalling from bulk substrates. Conventional thin film growth techniques often face challenges in achieving high-quality single crystal microstructure over large areas, resulting in reduced performance in functional devices. In contrast, spalling – i.e., performing stress-induced exfoliation […]
Kavli Affiliate: David Hsieh| Summary:Magnetism has played a central role in the long and rich history of modern condensed matter physics, with many foundational insights originating from theoretical studies of two-dimensional (2D) spin systems. The discovery of 2D van der Waals (vdW) magnets has revolutionized this area by providing real, atomically thin magnetic systems for […]
Kavli Affiliate: Wei Gao | First 5 Authors: BESIII Collaboration, BESIII Collaboration, , , | Summary: The lepton number violation decay $ωto π^+ π^+ e^-e^- +c.c.$ is searched for via $J/ψto ωη$ using a data sample of $(1.0087 pm 0.0044) times 10^10$ $J/ψ$ events collected by the BESIII detector at the BEPCII collider. No significant […]
Kavli Affiliate: Morteza Gharib| Summary:We present a novel architecture for accelerating PIV calculations. An optical flow hardware accelerator does the brunt of the work, with cross-correlation only providing quick corrections. The result is RapidPIV: a free-to-download software program for real-time particle image velocimetry (PIV) for Linux and Windows computers with an Nvidia Turing-gen (or newer) […]