Mesoscale and Nanoscale Physics
Semiconducting nanostructures: quantum dots, wires, and wells. Single electronics, spintronics, 2d electron gases, quantum Hall effect, nanotubes, graphene, plasmonic nanostructures
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Thicker rhombohedral graphene closes its band gap and winds Dirac nodes into spirals while surface flat bands survive.
· “Thickness-dependent Topological Phases and Flat Bands in Rhombohedral Multilayer Graphene”
The predicted e/3 quasiparticles would braid with opposite phases in neighboring supermoiré domains
Linear-response theory matches molecular dynamics on peak positions and shapes across sliding speeds.
· “Phononic frictional losses of a particle crossing a crystal: linear-response theory”
Color-center sensors find a slow proton layer pinned by photogenerated charge at the diamond and hBN walls.
· “Slow water in engineered nano-channels revealed by color-center-enabled sensing”
A 2040 retrospective says one measurement gate plus AI trained on quantum data can make quantum computers worth building.
Graphite contacts and hBN encapsulation expose the intrinsic effect, backed by shift-current calculations.
· “Unveiling intrinsic bulk photovoltaic effect in atomically thin ReS2”
A semiclassical map of graphene on an hBN bilayer shows the local Berry dipole winding around ABA and ABC stackings.
· “Winding Berry dipole on uniaxially strained graphene/hBN/hBN moir\'e trilayers”
A repulsive impurity binds to density holes, giving a spectroscopic marker of vortex proliferation in 2D and 3D.
Accurate nonlocal functionals become practical for large-scale simulations with accuracy nearly unchanged.
Mumax+ reproduces domain-wall motion, a NiO strain-driven racetrack, and Mn3Sn NV images.
· “mumax+: extensible GPU-accelerated micromagnetics and beyond”
A fully nonequilibrium Berry-curvature theory predicts odd harmonics without breaking time reversal.
The same moiré crystal speeds single-photon emission up to 27 times and slows it to 1.5 times, with relaxed emitter positioning.
· “Cavity-Quantum Electrodynamics with Moir\'e Flatband Photonic Crystals”
In a 2D topological insulator, broken Lorentz symmetry yields a bulk heat current beyond the quantized edge picture.
· “Broken Lorentz symmetry and violation of the Wiedemann-Franz law in topological insulators”
Gap grows 3–4 meV per tesla, up to 30 meV at 9 T — four times steeper than in extended graphene.
A 1 MHz dispersive shift with tunable Kerr puts a fluxonium ancilla past the transmon limit for bosonic control.
· “Fluxonium as a control qubit for bosonic quantum information”
One knob moves a zero-energy state between the defect site, the chain edges, and nowhere.
· “Reconfigurable Defect States in Non-Hermitian Topolectrical Chains with Gain and Loss”
Rotating the field splits resistivity into 2φ magnetic, 6φ crystal, and 3φ altermagnetic Hall parts.
Europium in ZnCdO quantum wells emits 616-nm light; 700 C annealing brightens it via defect-assisted energy transfer.
A single measured current and its fluctuations bound entropy production at any bias, with no heat-current measurement needed.
· “Thermodynamic Uncertainty Relations for Coherent Transport”
A new regrowth process and Al2O3 passivation push beta-gallium-oxide RF transistors to record speeds with no current collapse.
· “High performance vacuum annealed beta-(AlxGa1-x)2O3/Ga2O3 HFET with f_T/f_MAX of 32/65 GHz”
Hysteresis, nonlinear transport, and a symmetry change point to a charge order that superconductivity normally hides.
Soft-ferroelectric chip hits 1e-6 off-chip efficiency at 8 mK, a step toward quantum processor links.
Analytic one-phonon theory and colloid simulations predict a striped, anisotropic moiré state instead of the usual hexagonal one.
· “Striped twisted state in the orientational epitaxy on quasicrystals”
The alloy's 0.36 nm decay length and high resistivity rule it out for cryogenic memory.
· “Comparison of NiFeCr and NiFe in ferromagnetic Josephson junctions”
Rings without the core stay comb-free at any power; a small in-plane field restores both.
A Berry-flux patch deflects plasmons sideways at tunable meV resonances, no magnetic field needed.
· “Anomalous skew scattering of plasmons in a Dirac electron fluid”
A two-hour ethanol bath exfoliates graphite into micro-sized sheets with cleaner crystal order.
Second-harmonic Hall data tie spin conductance to deep subthermal magnons, so thin films amplify magnon generation.
Coupling peaks when half the magnon wavelength equals the chip width, across a 7 GHz band.
· “Broadband Magnomechanics Enabled by Magnon-Spoof Plasmon Hybridization”
A geometry-based cross test separates bulk Néel spin-orbit torque from slower thermal-strain switching.
· “Identifying Switching of Antiferromagnets by Spin-Orbit Torques”
Higher-order current correlations expose dynamics waiting-time analysis cannot distinguish, even in noisy weak measurements.
High-field polarimetry separates nonmagnetic difference-frequency generation from demagnetization of field-canted NiO spins.
Photon-normalized sensitivity grows with chain length for both perturbation types, up to a finite saturation bound.
· “Quantum Sensing with Driven-Dissipative Su-Schrieffer-Heeger Lattices”
Proximity to SnS imprints spin-orbit coupling on trilayer graphene, converting spin current to charge at up to 300 K.
Simulations show bandpass-filter sideband cooling stabilizes the code space at ~100 mK.
· “Self-correcting GKP qubit in a superconducting circuit with an oscillating voltage bias”
Linear band crossings with real energy and integer charge appear in a stacked non-Hermitian chain, then vanish when boundaries close.
· “Non-Bloch Dirac Points and Phase Diagram in the Stacked Non-Hermitian SSH Model”
Doping a nearby twisted bilayer cuts the critical temperature by more than an order of magnitude, evidence for electronic pairing.
· “Coulomb screening of superconductivity in magic-angle twisted bilayer graphene”
New calculations in BaCuF4, Ca3Mn2O7, and BiFeO3 point to electric-field control of altermagnets
· “Altermagnetic multiferroics and altermagnetoelectric effect”
In an interacting chiral dot, spin-density imbalance lets forward and reverse supercurrents differ.
· “Field-free Josephson diode effect in interacting chiral quantum dot junctions”
Adding $f=\gamma v^{\alpha}$ to Simmons' model reproduces Al/Al2O3/Al I-V curves and reveals the 137 K dissipation turnover.
The doubled-frequency current spikes at the spin-orbit splitting, with peak height set by the scattering time.
· “Resonant second harmonic generation in a two-dimensional electron system”
A purely electronic mechanism predicts the asymmetrical superconducting dome and few-kelvin critical temperature seen in experiments.
· “Superconductivity from collective excitations in magic angle twisted bilayer graphene”
Magnetoresistance fits show intervalley scattering grows as the square root of carrier density, then outruns tight-binding theory
· “Weak localization measurements of electronic scattering rates in Li-doped epitaxial graphene”
In a 0.5 degree twist bilayer under bias, three Fermi lines per valley become exact translations of the other valley's lines, with the…
· “Perfect and controllable nesting in the small angle twist bilayer graphene”
Proximity to WS2 gives graphene heavy-metal-class spin conversion, switchable by gate voltage.
· “Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures”
High-field optical data show the diamagnetic shift shrinks with temperature, implying a 475 meV binding energy at 300 K.
A 9 T in-plane field flips the spin texture only near the b-axis; signal falls as 1 over distance squared.
Conductance rises as microwaves warm the electron gas, and the breakdown threshold drops as the inverse square root of frequency.
· “Breakdown of the quantum anomalous Hall effect under microwave drives”
A tiny lithium-niobate transducer couples 2.8 GHz microwaves into a color-center-ready acoustic guide.
· “Integrated phononic waveguide on thin-film lithium niobate on diamond”
Linear wire relations make every stability region a polygon, with symmetries and a perfect diode.
Difference in switching currents stays near 1.5 µA as the out-of-plane field sweeps from -10 to +10 mT.
Match DFT structure and stiffness, so MD users can pick the right parameter set; first linear compressibility values included.
Liquid Field's metal creeps along the electrodes and cuts WSe2 contact resistance from 390 kΩ to 88 kΩ.
· “Self-patterning of Liquid Field's Metal for Enhanced Performance of Two-dimensional Semiconductor”
Wire resistance shifts a Cooper-pair transistor's chemical potential, making its supercurrents unequal at zero field.
Back-gate tunes the threshold voltage; conductance saturation hints at quantum tunneling.
· “Superinsulating behavior in granular Pb film on gated few-layer MoS₂”
An LC resonator on the drive coil yields eight sidebands, large splittings, and GHz-controlled magnon gates.
A wedged microcavity staircase turns each polariton step into coherent sound, with quantum efficiency near one.
A new master equation predicts how repeated qubit resets reshape two-level defect and nuclear-spin baths, matching experiments.
· “Active Quantum Reservoir Engineering: Using a Qubit to Manipulate its Environment”
Dissolved AgCl complexes put silver onto graphene, contaminating nanofluidic experiments and reinterpreting ionic Coulomb drag.
· “Silver Electrodeposition from Ag/AgCl Electrodes: Implications for Nanoscience”
Phonons set the high-field limit, 1/f charge noise the low-field one; the model matches two experiments.
· “Spin relaxation in a single-electron bilayer graphene quantum dot”
Ramping up linearly polarized light drives magnetically doped Bi2Te3 back toward the quantized e²/h channel.
· “Light-induced dissipationless states in magnetic topological insulators with hexagonal warping”
Atomistic simulations map three flow phases: jamming, laning, and collapse into a skyrmion-only lattice.
· “Skyrmion-Skyrmionium Phase Separation and Laning Transitions via Spin-Orbit Torque Currents”
Phase of X-ray magnetic linear dichroism gives sharper, higher-SNR nanoscale magnetic images, promising for antiferromagnets.
· “Nanoscale Mapping of Magnetic Orientations with Complex X-ray Magnetic Linear Dichroism”
Cooper pairs as hydrogen-like bound states plus screened-field averaging match the measured 10^8 V/m threshold in NbN films.
Spatial correlations push the same odds to ~60%, giving experimenters two new tuning knobs.
Analytic theory predicts a chiral breakdown field and directional wall motion, turning DMI sign into a control knob.
Nb/Bi0.8Sb1.2Te3/Nb junctions rectify supercurrent in an in-plane magnetic field, pointing to a Majorana-relevant probe.
· “Superconducting Diode Effect in Selectively-Grown Topological Insulator based Josephson Junctions”
Geometry itself forbids closed shells at large cluster sizes—terraced 'football' clusters take their place.
Charge offsets at 0, 1/4, 1/2, 3/4 and a log(4) entropy peak signal Majorana-dressed Andreev states.
Aluminum's UV plasmon splits H2 at intensities far below gold's, a boost for earth-abundant catalysis.
· “Density Functional Tight-Binding Captures Plasmon-Driven H₂ Dissociation on Al Nanocrystals”
A Wilson-loop condition classifies the grids and predicts spin transport in any direction without fine-tuned spin-orbit matching.
· “Persistent spin grids with spin-orbit coupled 2D electron gas”
Oscillations tied to spin precession of electron pairs signal an engineered axial spin-orbit field in LaAlO3/SrTiO3.
Near-field imaging shows boundary etching relaxes the triangular lattice, while 2D surface contacts preserve it.
· “Preserving Twist-Angle in Marginally Twisted Double-Bilayer Graphene Devices During Fabrication”
Nonlinear biasing boosts sidebands ~100x and cuts noise-equivalent power to 500 aW/√Hz.
· “Kerr non-linearity enhances the response of a graphene Josephson bolometer”
A three-terminal device using disordered-semiconductor reservoirs amplifies heat currents and temperature signals for cryogenic circuits.
· “Photonic heat amplifiers based on a disordered semiconductor”
Transient photovoltage microscopy clocks 800 cm²/s diffusivity at 21 K, pointing to exciton condensation.
· “Super-diffusion of Photoexcited Carriers in Topological Insulator Nanoribbons”
Contacts metallize the first layer; in trilayers the intrinsic middle layer blocks current.
· “Electronic properties and transport in metal/2D material/metal vertical junctions”
A single NV relaxometry map tells left- from right-handed domain walls and skyrmion chirality.
· “Thermal spin wave noise as a probe for the Dzyaloshinkii-Moriya interaction”
A stable MBene with spin-split bands could push spintronic memory readout to record sensitivity.
Three-step thermal protocol copies spin textures into a zero-magnetization antiferromagnet without losing topology.
· “Imprinting of skyrmions and bimerons in an antiferromagnet”