A5040193795- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Quantum Information and Cryptography
- Magnetic and transport properties of perovskites and related materials
- Quantum and electron transport phenomena
- Semiconductor materials and devices
- Atomic and Subatomic Physics Research
- Quantum Computing Algorithms and Architecture
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Mechanical and Optical Resonators
- Iron-based superconductors research
- 2D Materials and Applications
- Quantum optics and atomic interactions
- Graphene research and applications
- Ferroelectric and Negative Capacitance Devices
- Quantum Mechanics and Applications
- Magnetic properties of thin films
- Photonic and Optical Devices
- Diamond and Carbon-based Materials Research
- Acoustic Wave Resonator Technologies
- Quantum, superfluid, helium dynamics
- Ferroelectric and Piezoelectric Materials
- Spectroscopy and Quantum Chemical Studies
Apple (United States)
2023
Oak Ridge National Laboratory
2020-2023
University of California, Santa Barbara
2023
Quantum Science Center
2021-2023
University of Pittsburgh
2017-2023
Pittsburgh Quantum Institute
2017-2023
Naval Research Laboratory Materials Science and Technology Division
2023
Cornell University
2014
Practical quantum networking architectures are crucial for scaling the connection of resources. Yet network testbeds have thus far underutilized full capabilities modern lightwave communications, such as flexible-grid bandwidth allocation. In this work, we implement flex-grid entanglement distribution in a deployed first time, connecting nodes three distinct campus buildings time-synchronized via Global Positioning System (GPS). We quantify quality distributed polarization log-negativity,...
Abstract The electronic instabilities in CsV 3 Sb 5 are believed to originate from the V d -electrons on kagome plane, however role of p for 3-dimensional orders is largely unexplored. Here, using resonant tender X-ray scattering and high-pressure scattering, we report a rare realization conjoined charge density waves (CDWs) , where 2 × 1 CDW sublattice -electron assisted coexist. At ambient pressure, discover enhancement L -edge (2 s →5 ) at wavevectors. resonance, however, absent Applying...
The combination of non-trivial band topology and symmetry breaking phases gives rise to novel quantum states phenomena such as topological superconductivity, anomalous Hall effect axion electrodynamics. Evidence intertwined charge density wave (CDW) superconducting order parameters has recently been observed in a kagome material AV3Sb5 (A=K,Rb,Cs) that features Z2 invariant the electronic structure. However, origin CDW its intricate interplay with state yet be determined. Here, using hard...
As practical quantum networks prepare to serve an ever-expanding number of nodes, there has grown a need for advanced auxiliary classical systems that support the protocols and maintain compatibility with existing fiber-optic infrastructure. We propose demonstrate local area network design addresses current deployment limitations in timing security scalable fashion using commercial off-the-shelf components. First, we employ White Rabbit switches synchronize three remote nodes ultra-low...
Quantum materials (QMs) with strong correlation and nontrivial topology are indispensable to next-generation information computing technologies. Exploitation of topological band structure is an ideal starting point realize correlated QMs. Here, we report that strain-induced symmetry modification in oxide SrNbO3 thin films creates emerging structure. Dirac electrons strained reveal ultrahigh mobility (μmax ≈ 100,000 cm2/Vs), exceptionally small effective mass (m* ~ 0.04me), nonzero Berry...
We examine superconductivity in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ channels with widths that transition from the 1D to 2D regime. The superconducting critical current is independent of channel width and increases approximately linearly number parallel channels. Signatures electron pairing outside regime are also found be width. Collectively, these results indicate exists at boundary absent within interior region intrinsic nature interface imposes strong physical constraints on...
Investigations that probe defects one at a time offer unique opportunity to observe properties and dynamics are washed out of ensemble measurements. Here, we present confocal fluorescence measurements individual in ZnO nanoparticles sputtered films excited with sub-bandgap energy light. Photon correlation yield both antibunching bunching, indicative single-photon emission from isolated possess metastable shelving state. The is the range ∼560–720 nm typically exhibits two broad spectral peaks...
We report the growth of intrinsic magnetic topological system $\mathrm{MnTe}{({\mathrm{Bi}}_{2}{\mathrm{Te}}_{3})}_{n}$ by molecular beam epitaxy. By mapping temperature and Bi:Mn flux ratio, it is shown that there a narrow window for $n=1$ phase $\mathrm{Mn}{\mathrm{Bi}}_{2}{\mathrm{Te}}_{4}$ with $2.0<\mathrm{Bi}:\mathrm{Mn}<2.6$ at 225 \ifmmode^\circ\else\textdegree\fi{}C. Here films are stoichiometric excess Bi Te not incorporated. At higher ratios (Bi:Mn\ensuremath{\ge}4.5) found...
The interface between 2D topological Dirac states and an s-wave superconductor is expected to support Majorana-bound (MBS) that can be used for quantum computing applications. Realizing these novel of matter their applications requires control over superconductivity spin-orbit coupling achieve spin-momentum-locked (TIS) which are simultaneously superconducting. While signatures MBS have been observed in the magnetic vortex cores bulk FeTe0.55 Se0.45 , inhomogeneity disorder from doping make...
Abstract Understanding the effects of interfacial modification to functional properties magnetic topological insulator thin films is crucial for developing novel technological applications from spintronics quantum computing. Here, a large electronic and response reported be induced in intrinsic MnBi 2 Te 4 by controlling propagation surface oxidation. It shown that formation oxide layer confined top 1–2 unit cells but drives changes overall response. Specifically, dramatic reversal sign...
Spin defects like the negatively charged boron vacancy color center (VB-) in hexagonal nitride (hBN) may enable new forms of quantum sensing with near-surface layered van der Waals heterostructures. Here, effect strain on VB- centers hBN is revealed correlative cathodoluminescence and photoluminescence microscopies. Strong localized enhancement redshifting luminescence observed at creases, consistent density functional theory calculations showing migration toward regions moderate uniaxial...
An extremely large linear magnetoresistance (LMR) is a ubiquitous phenomenon emerging from topological Dirac and Weyl semimetals. However, the connection between an LMR nontrivial topology under extensive debate. In this paper, by precisely controlling thickness of ${\mathrm{SrNbO}}_{3}$ thin films grown on ${\mathrm{SrTiO}}_{3}$ substrates, we observe over carrier density range with as high $150\phantom{\rule{0.16em}{0ex}}000%$ at...
CsYbSe$_2$, a recently identified quantum spin liquid (QSL) candidate, exhibits strong crystal electric field (CEF) excitations. Here, we identify phonon and CEF modes with Raman spectroscopy observe CEF-phonon mixing resulting in vibronic bound state. Complex, mesoscale interplay between is observed real space, an unexpected nearly resonant condition satisfied, yielding up to fifth-order combination modes, total of 17 the spectra. This study paves way coherent control possible QSL ground...
Abstract Complex oxide heterostructures have fascinating emergent properties that originate from the of bulk constituents as well dimensional confinement. The conductive behavior polar/nonpolar LaAlO 3 /SrTiO interface can be reversibly switched using atomic force microscopy (c‐AFM) lithography, enabling a wide range devices and physics to explored. Here, extreme nanoscale control over CaZrO (CZO/STO) interface, which is formed two materials are both nonpolar, reported. Nanowires with...
The absence of clear signals from particle dark matter in direct detection experiments motivates new approaches disparate regions viable parameter space. In this Snowmass white paper, we outline the Windchime project, a program to build large array quantum-enhanced mechanical sensors. ultimate aim is detector capable searching for Planck mass-scale purely through its gravitational coupling ordinary matter. shorter term, search number other physics targets, especially some ultralight...
Abstract Magneto‐optical microscopies, including optical measurements of magnetic circular dichroism, are increasingly ubiquitous tools for probing spin‐orbit coupling, charge‐carrier g‐factors, and chiral excitations in matter, but the minimum detectable signal classical dichroism is fundamentally limited by shot‐noise limit readout field. Here, a two‐mode squeezed light source used to improve 3 decibels compared with state‐of‐the‐art measurements, even relatively lossy samples like terbium...
Understanding band alignment and charge transfer at complex oxide interfaces is critical to tailoring utilizing their diverse functionality. Towards this goal, we design experimentally validate both Ohmic- Schottky-like transfers oxide/oxide semiconductor/metal interfaces. We utilize a method for predicting in ABO3 perovskites, where previously established rules simple semiconductors fail. The prototypical systems chosen are the rare class of metals, SrBO3 with B=V-Ta, when interfaced...
Elucidating the symmetry of intertwined orders in exotic superconductors is at quantum frontier. Recent surface sensitive studies topological kagome superconductor CsV$_3$Sb$_5$ discovered a cascade 4a$_0$ superlattice below charge density wave (CDW) ordering temperature, which can be related to pair modulations superconducting state. If phase bulk and intrinsic property lattice, this would form striking analogy stripe order cuprate high-temperature superconductors, found twisted bilayer...
The current challenge to realizing continuously tunable magnetism lies in our inability systematically change properties, such as valence, spin, and orbital degrees of freedom, well crystallographic geometry. Here, we demonstrate that ferromagnetism can be externally turned on with the application low-energy helium implantation subsequently erased returned pristine state via annealing. This high level continuous control is made possible by targeting magnetic metastability...
Quantum devices present the potential for unparalleled computing and communications capabilities; however, cryogenic temperatures required to successfully control read out many qubit platforms can prove be very challenging scale. Recently, there has emerged an interest in using microwave photonics deliver signals down ultracold stages via optical fiber, thereby reducing thermal load facilitating dense wavelength multiplexing. Photodetectors then convert this energy electrical control. The...
The notion that phonons can carry pseudo-angular momentum has many major consequences, including topologically protected phonon chirality, Berry curvature of band structure, and the Hall effect. When a is resonantly coupled to an orbital state split by its crystal field environment, so-called vibronic bound forms. Here, observed in NaYbSe
Superconducting nanowire single-photon detectors (SNSPDs) offer high-quantum-efficiency and low-dark-count-rate detection. In a growing number of cases, large magnetic fields are being incorporated into quantum microscopes, nanophotonic devices, sensors for nuclear high-energy physics that rely on SNSPDs, but superconducting devices generally perform poorly in fields. Here, we demonstrate robust performance amorphous SNSPDs up to $\ifmmode\pm\else\textpm\fi{}6$ T with negligible dark-count...
We describe the operation of a free-space confocal optical microscope operated in dilution refrigerator. The is installed on cold insertable probe to enable fast sample exchange while refrigerator held at low temperatures. A vector magnet provides 6 T field normal and 1 fields arbitrary angles. variety microscopies spectroscopies, including photoluminescence, Raman, magneto-optical Kerr effect, spin relaxometry measurements are described, some challenges associated with performing these...
Ternary chalcogenides such as the parkerites and shandites are a broad class of materials exhibiting rich diversity transport magnetic behavior well an array topological phases including Weyl Dirac nodes. However, they remain largely unexplored high-quality epitaxial thin films. Here, we report self-regulated growth films strong spin-orbit coupled superconductor Pd3Bi2Se2 on SrTiO3 by molecular beam epitaxy. Films found to grow in fashion, where, excess Se, temperature relative flux ratio Pd...