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23 papers
First Principle Analysis of the Magnetism and Electronic Structure of Fe2XSi (X=Ti, V)
Hanieh Kachooee, Cindy Kim, Jason Carbajal +2
The electronic, magnetic, and mechanical properties of Fe2XSi, where X is titanium (Ti) and vanadium (V), are investigated using computational methods. Volume optimization reveals…
Enhance students learning outcomes by redesigning individual learning activities into group activities for introductory level Physics courses
Kalani Hettiarachchilage, Neel Haldolaarachchige
The evolution of science education is a dynamic process driven by advances in pedagogy, technology, and especially, our understanding of how students learn. Educators are exploring…
Effective Model with Personalized Online Teaching and Learning Science in the Era of ChatGPT
Kalani Hettiarachchilagea, Neel Haldolaarachchige
The recent development of science education leads educators to explore new teaching and learning methodologies and restructure classes and assignments to bring students' knowledge…
Signature of topological crystalline insulating behavior in new B2X2Zn (X=Ir, Rh, Co) compound from first-principles Computation
J. Howard, A. Rodriguez, N. Haldolaarachchige +1
Recent attempts at topological materials have revealed a large class of materials that show gapless surface states protected by time-reversal symmetry and crystal symmetries. Among…
Student performance analysis of virtual introductory calculus-based physics class
Neel Haldolaarachchige
Student performance of virtual introductory physics class (calculus-based mechanics) is analyzed. A fully web-enhanced class was done synchronously. The analysis is done in two cat…
A Set of Virtual Experiments of Fluids, Waves, Thermodynamics, Optics, and Modern Physics for Virtual Teaching of Introductory Physics
Neel Haldolaarachchige, Kalani Hettiarachchilage
This is the third series of the lab manuals for virtual teaching of introductory physics classes. This covers fluids, waves, thermodynamics, optics, interference, photoelectric eff…
Lab Manual of Introductory Physics-I for Virtual Teaching
Neel Haldolaarachchige, Kalani Hettiarachchilage
A set of virtual experiments were designed to use with introductory physics I (analytical and general) class, which covers kinematics, Newton laws, energy, momentum, and rotational…
Introductory E & M Lab Manual for Virtual Teaching
Neel Haldolaarachchige, Kalani Hettiarachchilage
Introductory electricity and magnetism lab manual was designed to use with virtual Physics II class. The lab manual consists of experiments on electrostatics, electric potential an…
Ir d-band Derived Superconductivity in the Lanthanum-Iridium System LaIr3
Neel Haldolaarachchige, Leslie Schoop, Mojammel A. Khan +4
The electronic properties of the heavy metal superconductor LaIr3 are reported. The estimated superconducting parameters obtained from physical properties measurements indicate tha…
Temperature-field phase diagram of extreme magnetoresistance in lanthanum monopnictides
F. F. Tafti, Q. D. Gibson, S. K. Kushwaha +3
The recent discovery of extreme magnetoresistance in LaSb introduced lanthanum monopnictides as a new platform to study topological semimetals (TSMs). In this work we report the di…
Resonance-state-induced superconductivity at high Indium contents in In-doped SnTe
Neel Haldolaarachchige, Quinn Gibson, Weiwei Xie +3
We report a reinvestigation of superconducting SnInTe at both low and high In doping levels. Analysis of the superconductivity reveals a fundamental change as a funct…
Consequences of breaking time reversal symmetry in LaSb: a resistivity plateau and extreme magnetoresistance
F. F. Tafti, Q. D. Gibson, S. K. Kushwaha +2
Time reversal symmetry (TRS) protects the metallic surface modes of topological insulators (TIs). The transport signature of robust metallic surface modes of TIs is a plateau that…
Characterization of the Heavy Metal Pyrochlore Lattice Superconductor CaIr2
Neel Haldolaarachchige, Quinn Gibson, Leslie M. Schoop +2
We report the electronic properties of the cubic laves phase superconductor CaIr2 (Tc = 5.8 K), in which the Ir atoms have a Pyrochlore lattice. The estimated superconducting param…
A large new family of filled skutterudites stabilized by electron count
Huixia Luo, Jason W. Krizan, Lukas Muechler +6
Based on the interplay of theory and experiment, a large new family of filled group 9 (Co, Rh and Ir) skutterudites is designed and synthesized. The new materials fill the empty ca…
Z topology and superconductivity from symmetry lowering of a 3D Dirac Metal AuPb
Leslie M. Schoop, Lilia S. Xie, Ru Chen +12
3D Dirac semi-metals (DSMs) are materials that have massless Dirac electrons and exhibit exotic physical properties It has been suggested that structurally distorting a DSM can cre…
Superconducting Properties of BaBi
Neel Haldolaarachchige, S. K. Kushwaha, Quinn Gibson +1
We report the superconducting properties of single crystals of the intermetallic perovskite-related compound BaBi. The superconducting transition temperature (~K)…
Titanic Magnetoresistance in WTe2
Mazhar N. Ali, Jun Xiong, Steven Flynn +6
Magnetoresistance is the change of a material's electrical resistance in response to an applied magnetic field. In addition to its intrinsic scientific interest, it is a technologi…
Superconducting Properties of the KWO Tetragonal Tungsten Bronze and the Superconducting Phase Diagram of the Tungsten Bronze Family
Neel Haldolaarachchige, Quinn Gibson, Jason Krizan +1
We report the superconducting properties of the KWO tetragonal tungsten bronze. The highest superconducting transition temperature (K) was obtained for K$_{0…
Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers
N. Haldolaarachchige, J. Prestigiacomo, W. Adam Phelan +9
The magnetic, transport, and thermal properties of single crystals of the series Fe(Ga1-xGex)3 are reported. Pure FeGa3 is a nonmagnetic semiconductor, that when doped with small c…
Thermoelectric Properties of Intermetallic Semiconducting RuIn3 and Metallic IrIn3
N. Haldolaarachchige, W. A. Phelan, Y. M. Xiong +4
Low temperature (<400 K) thermoelectric properties of semiconducting RuIn3 and metallic IrIn3 are reported. RuIn3 is a narrow band gap semiconductor with a large n-type Seebeck coe…
Superconducting and Critical Current Properties of NiBi3 Thin Films on Carbon Microfibers and Sapphire
N. Haldolaarachchige, Y. M. Xiong, P. W. Adams +1
The superconducting and critical current properties of thin films of NiBi3 formed on the surface of carbon microfibers and sapphire substrates are reported. The NiBi3 coated carbon…
Effect of Chemical Doping on the Thermoelectric Properties of FeGa3
N. Haldolaarachchige, A. B. Karki, W. Adam Phelan +5
Thermoelectric properties of the chemically-doped intermetallic narrow-band semiconductor FeGa3 are reported. The parent compound shows semiconductor-like behavior with a small ban…
Physical properties of the non-centrosymmetric superconductor Nb0.18Re0.82
Amar B. Karki, Yimin M. Xiong, Neel Haldolaarachchige +6
We report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline Nb0.18Re0.82, which has a superconducting transition at Tc ~ 8.8 K. The n…