RSS 1.0Faculty Publications-Physics
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The newborn planet population emerging from ring-like structures in discs
(Royal Astronomical Society, 2019-03-29)ALMA has observed a plethora of ring-like structures in planet-forming discs at distances of 10–100 au from their host star. Although several mechanisms have been invoked to explain the origin of such rings, a common ... -
An IRTF-iSHELL Survey of 4.52–5.25 μm CO Spectra in Protoplanetary Disks of Intermediate-mass Stars: Preliminary Sample and Analysis
(American Astronomical Society, 2021-04)We are conducting a survey of high-resolution near-infrared CO rovibrational spectra in protoplanetary disks around young intermediate-mass stars. We use IRTF-iSHELL with the 0.″375 and 0.″75 slits, providing 4 km s−1 ... -
Gas Evolution in Inner Disk Cavities from a Synergic Analysis of IR-CO and UV-H2 Spectra
(American Astronomical Society, 2021-04)We are conducting a multi-wavelength analysis of high-resolution molecular spectra that probe the evolution of gas in the inner 10 au in protoplanetary disks. A sample of 15 disks has been combined to probe a range of inner ... -
Low temperature atomic layer deposition of zirconium oxide for inkjet printed transistor applications
(Royal Society of Chemistry, 2019-01)We report the growth of zirconium oxide (ZrO2) as a high-k gate dielectric for an inkjet-printed transistor using a low-temperature atomic layer deposition (ALD) from tetrakis(dimethylamido)zirconium (TDMAZr) ... -
Optical Excitation of Atomic Force Microscopy Cantilever for Accurate Spectroscopic Measurements
(EDP Sciences, 2020)Reliable operation of frequency modulation mode atomic force microscopy (FM-AFM) depends on a clean resonance of an AFM cantilever. It is recognized that the spurious mechanical resonances which originate from various ... -
Constraining the Nuclear Equation of State via Gravitational-wave Radiation of Short Gamma-Ray Burst Remnants
(The American Astronomical Society, 2020-02)The observed internal plateau of X-ray emission in some short gamma-ray bursts (GRBs) suggests the formation of a remnant supramassive magnetar following a double neutron star (NS) merger. In this paper, we assume that ... -
Structural and Electronic Properties of Iron-Doped Sodium Montmorillonite Clays: A First-Principles DFT Study
(American Chemical Society, 2019-08)First-principles calculations done via density functional theory were used to study the structural and electronic properties of sodium montmorillonite clay (Mt-Na+) of general formula MxAl3Investigation of Cadmium Telluride Grown by Molecular-Beam Epitaxy using Micro-Raman Spectroscopy Below and Above the Laser Damage Threshold
(American Institute of Physics, 2018-09)The effects of visible laser light on cadmium telluride (CdTe), grown by molecular beam epitaxy, are studied at low (48 µW/µm2) and high (480µW/µm2 laser power densities using micro-Raman spectroscopy. ...Electrical and Optical Characterization of CdTe Solar Cells with CdS and CdSe Buffers: A Comparative Study
(American Institute of Physics, 2018-09)A study is reported comparing the electrical and optical properties of CdTe solar cells, prepared using CdS and CdSe buffer layers, to investigate defects in the bulk and interface, carrier transport, and recombination. ...Incomplete Ionization of a 110 meV Unintentional Donor in β-Ga2O3 and its Effect on Power Devices
(Nature Research, 2017-10)Understanding the origin of unintentional doping in Ga2O3 is key to increasing breakdown voltages of Ga2O3 based power devices. Therefore, transport and capacitance spectroscopy ...Effect of Tb3+ Concentration on the Optical and Vibrational Properties of YBO3 Tri-doped with Eu3+, Ce3+, and Tb3+
(American Institute of Physics, 2014-05-09)Structural and optical studies are reported of yttrium orthoborate YBO3 when tri-doped with Eu3+, Ce3+, and Tb3+, focusing on the role of terbium concentration. Incorporation of ...Hydrogen-doping Stabilized Metallic VO2 (R) Thin Films and their Application to Suppress Fabry-Perot Resonances in the Terahertz Regime
(American Institute of Physics, 2014-06-16)We demonstrate that catalyst-assisted hydrogen spillover doping of VO2 thin films significantly alters the metal-insulator transition characteristics and stabilizes the metallic rutile phase at room temperature. ...Continuous Tuning of W-doped VO2 Optical Properties for Terahertz Analog Applications
(American Institute of Physics, 2014-11-17)Vanadium dioxide (VO2), with its characteristic metal-insulator phase transition, is a prospective active candidate to realize tunable optical devices operating at terahertz (THz) frequencies. However, the abrupt ...Straightforward Electrical Measurement of Forward-voltage to Investigate Thermal Effects in InGaN/GaN High-brightness Light-emitting Diodes
(American Vacuum Society, 2014-11-12)The junction temperature of InGaN/GaN MQW high-brightness light-emitting diodes is measured using an electrical method based on the dependence of diode forward voltage, Vƒ, on the junction temperature ...Raman Measurements of Substrate Temperature in a Molecular Beam Epitaxy Growth Chamber
(American Institute of Physics, 2015-01-16)A method is described for directly measuring the temperature of a substrate in a molecular-beam epitaxy (MBE) growth system. The approach relies on the establishment of the temperature dependence of Raman-active phonons ...Optical Studies of the Effect of Oxidation on GaN
(American Vacuum Society, 2014-01-09)Optical studies are reported of GaN following oxide layer growth using thermal oxidation and atomic layer deposition (ALD). The low-temperature photoluminescence (PL) probes the topmost GaN layer (<100 nm) where any influence ...Factors Influencing Photoluminescence and Photocarrier Lifetime in CdSeTe/CdMgTe Double Heterostructures
(American Institute of Physics, 2016-10-28)CdSeTe/CdMgTe double heterostructures were produced with both n-type and unintentionally doped absorber layers. Measurements of the dependence of photoluminescence intensity on excitation intensity were carried out, as ...Radiative and Interfacial Recombination in CdTe Heterostructures
(American Institute of Physics, 2014-12-02)Double heterostructures (DH) were produced consisting of a CdTe film between two wide band gap barriers of CdMgTe alloy. A combined method was developed to quantify radiative and non- radiative recombination rates by ...Participation and Performance on Paper- and Computer-based Low-stakes Assessments
(Springer Open, 2018-05)Background: High-stakes assessments, such the Graduate Records Examination, have transitioned from paper to computer administration. Low-stakes research-based assessments (RBAs), such as the Force Concept Inventory, ...
Near-Ultraviolet Micro-Raman Study of Diamond Grown on GaN
(AIP Publishing, 2016-01-19)Ultraviolet (UV) micro-Raman measurements are reported of diamond grown on GaN using chemical vapor deposition. UV excitation permits simultaneous investigation of the diamond (D) and disordered carbon (DC) comprising the ...
