A5024705448- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Topological Materials and Phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Nanowire Synthesis and Applications
- Surface and Thin Film Phenomena
- Advanced Condensed Matter Physics
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and devices
- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- Fusion materials and technologies
- Molecular Junctions and Nanostructures
- Transition Metal Oxide Nanomaterials
- Carbon Nanotubes in Composites
- Nanoporous metals and alloys
- Laser-Ablation Synthesis of Nanoparticles
- Mechanical and Optical Resonators
- Chalcogenide Semiconductor Thin Films
- Quantum, superfluid, helium dynamics
- Advanced Sensor and Energy Harvesting Materials
- Advanced MEMS and NEMS Technologies
Brookhaven National Laboratory
2016-2025
Center for Functional Nanomaterials
2009-2025
Binghamton University
2024
Purdue University West Lafayette
2024
Upton Hospital
2019
Stony Brook University
1999-2008
Keeping cool Silver ants inhabit one of the hottest and driest environments on Earth, Saharan sands, where most insects shrivel die moments after contact. Shi et al. show that triangular shape silver hairs cover their bodies enables this existence. The both increase reflection near-infrared rays dissipate heat from ants' bodies, even under full sun conditions. Evolution's simple solution to intense management in species could lead better designs for passive cooling human-produced objects....
In two dimensions, the laws of physics permit existence anyons, particles with fractional statistics which is neither Fermi nor Bose. That is, upon exchange such particles, quantum state a system acquires phase 0 \pi, but can be any value. The elementary excitations (Laughlin quasiparticles) Hall fluid have electric charge and are expected to obey statistics. Here we report experimental realization novel Laughlin quasiparticle interferometer, where quasiparticles 1/3 execute closed path...
Understanding the role of interfaces is important for improving performance all-solid-state lithium ion batteries. To study these interfaces, we present a novel approach fabrication electrochemically active nanobatteries using focused beams and their characterization by analytical electron microscopy. Morphological changes scanning transmission microscopy imaging correlated elemental concentration energy loss spectroscopy mapping are presented. We provide first evidence accumulation at...
Abstract Despite mounting evidence that materials imperfections are a major obstacle to practical applications of superconducting qubits, connections between microscopic material properties and qubit coherence poorly understood. Here, we combine measurements transmon relaxation times ( T 1 ) with spectroscopy microscopy the polycrystalline niobium films used in fabrication. By comparing deposited using three different techniques, reveal correlations intrinsic film such as grain size,...
On a two-dimensional crystal, "superlattice" with nanometer-scale periodicity can be imposed to tune the Bloch electron spectrum, enabling novel physical properties inaccessible in original crystal. While creating 2D superlattices by means of nanopatterned electric gates has been studied for band structure engineering recent years, evidence correlations─which drive many problems at forefront physics research─remains uncovered. In this work, we demonstrate signatures correlated insulator...
We report an Aharonov-Bohm superperiod of five magnetic flux quanta (5h/e) observed in a Laughlin quasiparticle interferometer, where edge channel the 1/3 fractional quantum Hall fluid encircles island 2/5 fluid. This result does not violate gauge invariance argument Byers-Yang theorem because flux, addition to affecting phase encircling quasiparticles, creates quasiparticles island. The is accordingly understood as imposed by anyonic statistical interaction quasiparticles.
We report experimental realization of a quasiparticle interferometer where the entire system is in $1/3$ primary fractional quantum Hall state. The consists chiral edge channels coupled by quantum-coherent tunneling two constrictions, thus enclosing an Aharonov-Bohm area. observe magnetic flux and charge periods $h/e$ $e/3$, equivalent to creation one quasielectron island. Quantum theory predicts $3h/e$ period for integer statistics particles. Thus, observed demonstrate anyonic braiding...
Abstract Patterning of materials at single nanometer resolution allows engineering quantum confinement effects, as these effects are significant length scales, and yields direct control over electro‐optical properties. Silicon is by far the most important material in electronics, ability to fabricate Si‐based devices smallest dimensions for novel device highly desirable. The work presented here uses aberration‐corrected electron‐beam lithography combined with dry reactive ion etching achieve...
Thin-film solid-state metal dealloying (thin-film SSMD) is a promising method for fabricating nanostructures with controlled morphology and efficiency, offering advantages over conventional bulk materials processing methods integration into practical applications. Although machine learning (ML) has facilitated the design of systems, selection key thermal treatment parameters nanostructure formation remains largely unknown dependent on experimental trial error. To overcome this challenge,...
Two-dimensional van der Waals magnets hosting topological magnetic textures, such as skyrmions, show promise for spintronics and quantum computing. Electrical control of these spin textures is crucial enhancing operational performance functionality. Here, using electron microscopy combined with in situ electric biasing, we that the skyrmion helicity insulating Cr2Ge2Te6 can be controlled by direction external field applied during cooling process. The field-tuned remains stable at low...
Herein, we report the synthesis of one-dimensional chromium oxide nanostructures, utilizing a modified sol−gel technique combined with constrained template environment. Using scanning electron microscopy (SEM), transmission (TEM), and high-resolution (HRTEM), noted that individual nanowires were cylindrical in nature appeared to be composed smaller, crystalline, constituent nanoparticles, sintered aggregated together so as form discrete, polycrystalline structure. Spectroscopic diffraction...
We report experiments on a quantum electron interferometer fabricated from high mobility, low density $\mathrm{Al}\mathrm{Ga}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ heterostructure material. In this device, nearly circular island is defined by four front gates deposited in etched trenches. The separated the two-dimensional (2D) bulk two open constrictions. Hall regime, counterpropagating edge channels are coupled tunneling constrictions, thus forming closed interference path. For several fixed...
We report experiments on Fabry-Perot electron interferometers in the integer quantum Hall regime. The $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}$ heterostructure devices consist of two constrictions defined by etch trenches two-dimensional layer, enclosing an approximately circular island. interferometer is formed counterpropagating chiral edge channels coupled tunneling constrictions. Interference fringes are observed as conductance oscillations, similar to Aharonov-Bohm...
Indium substitution turns the topological crystalline insulator (TCI) ${\mathrm{Pb}}_{0.5}$${\mathrm{Sn}}_{0.5}\mathrm{Te}$ into a possible superconductor. To investigate effect of indium concentration on crystal structure and superconducting properties $({\mathrm{Pb}}_{0.5}$${\mathrm{Sn}}_{0.5})$${}_{1\ensuremath{-}x}$${\mathrm{In}}_{x}\mathrm{Te}$, we have grown high-quality single crystals using modified floating-zone method performed systematic studies for content in range...
Solid-state interfacial dealloying creates bi-continuous nanostructured thin films with 3D interconnected morphology, revealed by multimodal characterization, offering potential applications in catalysis, biomedical sensing and energy storage.
Herein, a single-step production for the development of gas sensing devices from unsubstituted and hexadecafluorinated metal phthalocyanines (MPc, M = Fe2+ Co2+) is explained. The preparation sensor by direct growth nanowires on interdigitated electrodes vapor transport synthesized MPc precursors discussed, emphasizing approach. Results using as-prepared detection NH3 NO2 in ppb range are shown. In agreement with similar materials, response recovery times fitted double-exponential model gave...
Kagome lattice materials have attracted growing interest for their topological properties and flatbands in electronic structure. We present a comprehensive study on the anisotropy out-of-plane electric transport ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$, metal with bilayer of Fe kagome planes massive Dirac fermions that features high-temperature noncollinear magnetic structure skyrmions. For electrical current path along $c$ axis, micron-size crystals, we found large Hall effect over wide...
An apparent $h/fe$ Aharonov-Bohm flux period, where $f$ is an integer, has been reported in coherent quantum Hall devices. Such subperiod not expected for noninteracting electrons and thus thought to result from interelectron Coulomb interaction. Here we report experiments a Fabry-Perot interferometer comprised of two wide constrictions enclosing electron island. By carefully tuning the constriction front gates, find regime interference oscillations with period $h/2e$ persist throughout...
Sb(2)Te(3) and Bi(2)Te(2)Se semiconductor materials were used as the source drain contact in fabrication of carbon nanotube field-effect transistors (CNTFETs). Ultra-purified single-walled nanotubes (SWCNTs) ultrasonically dispersed N-methyl pyrrolidone solvent. Dielectrophoresis was to deposit align SWCNTs for CNTFETs. The Sb(2)Te(3)- Bi(2)Te(2)Se-based CNTFETs demonstrate p-type metal-oxide-silicon-like I-V curves with high on/off drain-source current ratio at large voltages good...