Condensed Matter Physics
Bulk 4Hb-TaS₂ Hosts Emergent Incommensurate Potential That Drives Mott Physics and Competes with Superconductivity
A study of 4Hb-TaS₂ — a bulk transition-metal dichalcogenide polytype alternating 1T and 1H layers — reveals that lattice mismatch between these layers generates an emergent incommensurate potential analogous to a moiré effect in a 3D bulk material, a phenomenon previously overlooked in hybrid TMDs.…
Self-Organized Mn(Bi,Sb)2Te4 Lamellae Enable High-Temperature Magnetic Proximity and Field-Free Spin-Orbit Torque Switching
Mn interdiffusion from MnTe into (Bi,Sb)2Te3 forms self-organized Mn(Bi,Sb)2Te4 septuple lamellae alternating with (Bi,Sb)2Te3 quintuple layers, verified by STEM and polarized neutron reflectometry. Above its Néel temperature of 20 K, Mn(Bi,Sb)2Te4 mediates exchange coupling to induce an anomalous H…
Variational Ansatz Bias Causes Discrepancies in Hubbard Model Ground State; Systematic Improvement Reveals Coexisting Superconducting and Stripe Orders
In the 2D Hubbard model at finite doping, different Transformer backflow fermionic wave functions (Slater determinant, particle-hole, Pfaffian) achieve near-degenerate state-of-the-art energies but initially converge to qualitatively distinct spin, charge, and pairing correlations due to ansatz bias…
Neutron Diffraction Reveals G-type Antiferromagnetism in Rb1-xV2Te2O, Challenging Altermagnet Expectations
Neutron powder diffraction on Rb1-xV2Te2O, a metallic room-temperature altermagnet candidate with layered structure and d-wave spin symmetry, identifies a G-type antiferromagnetic order below 337 K. This finding from NPD contrasts with prior theoretical predictions based on spin-resolved PES and STM…
Andreev Diffraction Grating Realized in Superconductor-Semiconductor Hybrids
Researchers demonstrate optical-style diffraction in superconductor-semiconductor hybrids using multiple parallel Andreev scatterers, with phase differences controlled by tapping a remote superconducting meander. They observe local and nonlocal diffraction patterns in arrays of 2, 3, 4, and 10 scatt…
Tantalum Nitride Nanowires with Integrated Copper Heatsinking for Scalable Superconducting Detectors
This study investigates the superconducting properties of TaN and TaN/Cu bilayer nanowires fabricated using CMOS-compatible processes on 300 mm wafers. The integration of a copper heatsink significantly enhances thermal dissipation, addressing a critical limitation in superconducting nanowire single…
Disorder Drives Quantum Hall Systems from Fractional Liquids through Local Solids to Amorphous States
In strong magnetic fields, increasing disorder in 2D electron systems induces transitions from classical Wigner crystals to local crystals and amorphous solids, with structure factors showing distinct peaks and rings in noninteracting cases. Fractional quantum Hall liquids similarly evolve from inco…
Twist Angle Mechanically Tunes Quantum Emitters in hBN Bilayers by Over 30 nm
Researchers demonstrate twist-angle control of single quantum emitters in hBN van der Waals homobilayers at room temperature via interlayer coupling. DFT calculations reveal strong dependence of emitter properties on twist angle and top-layer stacking. Experimentally, in-situ mechanical twisting of …
Spin-Echo Technique Reveals 1/f Charge Noise as Dominant Dephasing Mechanism in Charge-Based Cooper-Pair Box
Researchers apply a spin-echo-type pulse sequence using gate-voltage pulses to a charge-based two-level system in a Cooper-pair box, enabling refocused echo signals that mitigate inhomogeneity in ensemble measurements. The observed echo decay time aligns with estimated decoherence times, indicating …
Multi-Directional FIB Etching Enables Nanoscale High-Quality Nb Josephson Junctions for SETs
Researchers developed a focused-ion-beam (FIB) etching process from multiple directions to fabricate nanoscale Nb/(Al-)Al2O3/Nb tunnel junctions. Applied to a single-electron transistor (SET), the device exhibited superconducting gap energy and transition temperature matching bulk Nb values, confirm…
Magnon Topology Enhances Quantum Anomalous Hall State Stability
This paper investigates magnon excitations in moiré Chern ferromagnets, focusing on their influence on magnetic stability and transition temperature at integer filling factor \nu = -1. The research reveals that magnon spectra exhibit isolated low-energy bands whose topological character is tunable v…
High Magnetic Fields Induce Novel Phases in 3D Electron Gases
This paper investigates the behavior of three-dimensional electron gases under strong magnetic fields, exploring how interactions and symmetry breaking can lead to various emergent phases. The focus is on the competition between charge density waves and superconductivity under different perturbation…
Direct Measurement of Long-Range Phase Coherence in Hybrid Josephson Junction Arrays
This research directly images local susceptibility in hybrid Josephson junction arrays using scanning SQUID, providing insights into superconductivity coherence and its suppression near quantum phase transitions. The study reveals the amplitude and spatial phase structures of superconducting states …
Heterodyne Imaging Reveals Band Structures of Damon-Eshbach Modes in 1D Magnonic Crystals
Researchers demonstrate real-space imaging of optical heterodyne signals from Brillouin light scattering by coherently driven magnons in magnetostatic modes. This technique characterizes surface Damon-Eshbach modes in a 1D magnonic crystal formed by aluminum strips on a ferromagnetic film, with band…
Translational Deformations of Periodic Potentials Generate Topological Boundary Modes
Continuous translational deformations of periodic potentials produce localized boundary states, distinct from defect perturbations or terminations. A rigorous theoretical proof establishes their emergence, with experimental validation in microwave photonic crystals. The mechanism manifests topologic…
Gebhard-Ruckenstein Hopping Enables Chiral Microwave Propagation in Superconducting Circulators
Gebhard-Ruckenstein hopping between microwave resonators in a superconducting device produces linear energy dispersion, enabling chiral microwave propagation. This mechanism supports nonreciprocal microwave transmission, allowing the device to function as an on-chip circulator. Attaching transmissio…