A5009506161- Photonic and Optical Devices
- Graphene research and applications
- Machine Learning in Materials Science
- 2D Materials and Applications
- Copper Interconnects and Reliability
- Spectroscopy and Quantum Chemical Studies
- ZnO doping and properties
- Advanced Photonic Communication Systems
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Crystallography and molecular interactions
- Computational Drug Discovery Methods
- Topological Materials and Phenomena
- Aluminum Alloys Composites Properties
- Metal and Thin Film Mechanics
- MXene and MAX Phase Materials
- Quantum and electron transport phenomena
- Optical Network Technologies
- Thermal properties of materials
- Ferroelectric and Negative Capacitance Devices
- Plasmonic and Surface Plasmon Research
- Semiconductor Quantum Structures and Devices
- High-pressure geophysics and materials
- Copper-based nanomaterials and applications
Rensselaer Polytechnic Institute
2019-2024
IBM Research - Thomas J. Watson Research Center
2022-2024
University of Rochester
2022-2023
GITAM University
2023
University of California System
2022
Carnegie Mellon University
2018
The increasing resistance of copper (Cu) interconnects for decreasing dimensions is a major challenge in continued downscaling integrated circuits beyond the 7 nm technology node as it leads to unacceptable signal delays and power consumption computing. resistivity Cu increases due electron scattering at surfaces grain boundaries nanoscale. Topological semimetals, owing their topologically protected surface states suppressed backscattering, are promising candidates potentially replace...
Aluminum nanostructures are a promising alternative material to noble metal for several photonic and catalytic applications, but their ultrafast electron dynamics remain elusive. Here, we combine single-particle transient extinction spectroscopy parameter-free first-principles calculations investigate the non-equilibrium carrier in aluminum nanostructures. Unlike gold nanostructures, find sub-picosecond optical response of lithographically fabricated nanodisks be more sensitive lattice...
Abstract Designing new quantum materials with long-lived electron spin states urgently requires a general theoretical formalism and computational technique to reliably predict intrinsic relaxation times. We present new, accurate universal first-principles methodology based on Lindbladian dynamics of density matrices calculate spin-phonon time solids arbitrary mixing crystal symmetry. This method describes contributions Elliott-Yafet D’yakonov-Perel’ mechanisms for systems without inversion...
Increasing resistivity of metal wires with reducing nanoscale dimensions is a major performance bottleneck semiconductor computing technologies. We show that metals suitably anisotropic Fermi velocity distributions can strongly suppress electron scattering by surfaces and outperform isotropic conductors such as copper in wires. derive corresponding descriptor for the scaling conductors, screen thousands using first-principles calculations this descriptor, identify most promising materials...
Intermetallic compounds have been proposed as potential interconnect materials for advanced semiconductor devices. This study reports the interdiffusion reliability and resistivity scaling of three low-resistivity intermetallic (Cu2Mg, CuAl2, NiAl) formed on thermally grown SiO2. Experimental observations thermodynamic calculations indicated good with CuAl2 NiAl but not Cu2Mg. was due to slow reaction between Al SiO2 in conjunction strong chemical bonds Cu–Al Ni–Al. As scaling, all showed...
The resistivity size effect in the ordered intermetallic CuTi compound is quantified using situ and ex thin film ρ measurements at 295 77 K, density functional theory Fermi surface electron–phonon scattering calculations. Epitaxial CuTi(001) layers with thickness d = 5.8–149 nm are deposited on MgO(001) 350 °C exhibit vs data that well described by classical Fuchs Sondheimer model, indicating a room-temperature effective electron mean free path λ 12.5 ± 0.6 nm, bulk ρo 19.5 0.3 μΩ cm,...
In situ transport measurements on 5.8–92.1 nm thick epitaxial Ti4SiC3(0001) layers are used to experimentally verify the previously predicted low resistivity scaling. Magnetron co-sputtering from three elemental sources at 1000 °C onto 12-nm-thick TiC(111) nucleation Al2O3(0001) substrates yields growth with || and Ti4SiC3(101¯0) Al2O3(21¯1¯0), a thickness-independent surface roughness of 0.6 ± 0.2 nm, measured stoichiometric composition. The room-temperature ρ increases slightly decreasing...
The detailed understanding of energy transfer between hot electrons and lattice vibrations at non-cryogenic temperatures relies primarily upon the interpretation ultrafast pump–probe experiments, where thermo-optical models provide insight into relationship optical response temperature respective sub-systems; in one more studied materials, gold, Drude model provides this relationship. In work, we investigate role intra- interband contributions applied to transient responses experiments using...
Three models of the ${\mathrm{C}}_{60}$ molecular crystal are studied using dynamics simulations to resolve roles played by intermolecular and intramolecular degrees freedom (DOF) in its structural, mechanical, thermal properties at temperatures between 35 400 K. In full DOF model, all active. rigid body frozen, such that only center mass (COM) translations rotations/librations point molecule is replaced a mass, COM The zero-pressure lattice constants bulk moduli predicted from three fall...
Identifying collective variables (CVs) for chemical reactions is essential to reduce the 3N-dimensional energy landscape into lower dimensional basins and barriers of interest. However, in condensed phase processes, nonmeaningful motions bulk solvent often overpower ability dimensionality reduction methods identify correlated that underpin variables. Yet can play important indirect or direct roles reactivity, much be lost through treatments remove dampen motion. This has been amply...
Realizing the potential of plasmonic hot carrier harvesting for energy conversion and photodetection requires new materials that resolve bottleneck extracting carriers prior to relaxation within metal. Using first-principles calculations optical response transport properties, we show directional conductors with Fermi velocities restricted predominantly one or two directions present significant advantages efficient harvesting. We filmlike ${\mathrm{PtCoO}}_{2}$...
Bragg-grating based cavities and coupler designs present opportunities for flexible allocation of bandwidth spectrum in silicon photonic devices. Integrated devices are moving toward mainstream, mass adoption, leading to the need compact Bragg grating designs. In this work we a design experimental validation cascaded contra-directional with measured main lobe side-lobe contrast 12.93 dB. This level performance is achieved more size as compared conventional apodized gratings, similar...
In the past few years, FDM basedpolymer3D printing process has flourished mainly with ABS filaments as a thermoplastic source. Food packing, medical, marine and agriculture industries employdevices other usable items made of polymers. Utilizing layered fabrication components in these areascompelthem to have self-cleansing, anti-freezing corrosion resistant surfaces. It is generally complex expensive prepare hydrophobic coatings. The present work related development surface coating on 3D...
Protected surface states arising from non-trivial bandstructure topology in semimetals can potentially enable new device functionalities compute, memory, interconnect, sensing, and communication. This necessitates a fundamental understanding of surface-state transport nanoscale topological semimetals. Here, we investigate quantum prototypical semimetal NbAs to evaluate the potential this class materials for beyond-Cu interconnects highly-scaled integrated circuits. Using density functional...
We present a new method for PM-fiber to photonic chip connection via laser fusion. This enables low cost and robust coupling with -1.1dB loss per facet while maintaining 20dB or greater polarization extinction ratio.
We present a new method for PM-fiber to photonic chip connection via laser fusion. This enables low cost and robust coupling with -1.1dB loss per facet while maintaining 20dB or greater polarization extinction ratio.
Identifying collective variables for chemical reactions is essential to reduce the 3$N$ dimensional energy landscape into lower basins and barriers of interest. However in condensed phase processes, non-meaningful motions bulk solvent often overpower ability dimensionality reduction methods identify correlated that underpin variables. Yet can play important indirect or direct roles reactivity much be lost through treatments remove dampen motion. This has been amply demonstrated within...