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Full-Text Articles in Physics
Spectral Observations Of The 2019 South American Total Solar Eclipse, Sarah Auriemma
Spectral Observations Of The 2019 South American Total Solar Eclipse, Sarah Auriemma
Honors Program Theses and Projects
On July 2, 2019, a total solar eclipse was visible in parts of Chile and Ar-gentina. I joined the Solar Wind Sherpas, an international group of scientists,engineers, students, and eclipse enthusiasts, to South America to make obser-vations of the solar corona (the Sun’s upper atmosphere) during the eclipse.The Sherpas were split into three teams along the path of totality and my groupwas stationed at Mamalluca Observatory in Vicuna, Chile. One of the instru-ments we used at this side was a three-channel (red, green, and blue) spectrom-eter designed by A. Ding, of Hawai’i’s Institute for Astronomy. Spectra from thecorona can be …
Topological Nodal Line Semimetal In An Orthorhombic Graphene Network Structure, Jian-Tao Wang, Changfeng Chen, Yoshiyuki Kawazoe
Topological Nodal Line Semimetal In An Orthorhombic Graphene Network Structure, Jian-Tao Wang, Changfeng Chen, Yoshiyuki Kawazoe
Physics & Astronomy Faculty Research
Topological semimetals are a fascinating class of quantum materials that possess extraordinary electronic and transport properties. These materials have attracted great interest in recent years for their fundamental significance and potential device applications. Currently a major focus in this research field is to theoretically explore and predict and experimentally verify and realize material systems that exhibit a rich variety of topological semimetallic behavior, which would allow a comprehensive characterization of the intriguing properties and a full understanding of the underlying mechanisms. In this paper, we report on ab initio calculations that identify a carbon allotrope with simple orthorhombic crystal structure …
Ground-State Characterizations Of Systems Predicted To Exhibit L11 Or L13 Crystal Structures, Lance J. Nelson, Gus L. W. Hart, Stefano Curtarolo
Ground-State Characterizations Of Systems Predicted To Exhibit L11 Or L13 Crystal Structures, Lance J. Nelson, Gus L. W. Hart, Stefano Curtarolo
Faculty Publications
Despite their geometric simplicity, the crystal structures L11 (CuPt) and L13 (CdPt3) do not appear as ground states experimentally, except in Cu-Pt. We investigate the possibility that these phases are ground states in other binary intermetallic systems, but overlooked experimentally. Via the synergy between high-throughput and cluster-expansion computational methods, we conduct a thorough search for systems that may exhibit these phases and calculate order-disorder transition temperatures when they are predicted. High-throughput calculations predict L11 ground states in the systems Ag-Pd, Ag-Pt, Cu-Pt, Pd-Pt, Li-Pd, Li-Pt and L13 ground states in the systems Cd-Pt, Cu-Pt, Pd-Pt, Li-Pd, Li-Pt. Cluster expansions confirm …
Guiding The Experimental Discovery Of Magnesium Alloys, Richard H. Taylor, Gus L. W. Hart, Stefano Curtarolo
Guiding The Experimental Discovery Of Magnesium Alloys, Richard H. Taylor, Gus L. W. Hart, Stefano Curtarolo
Faculty Publications
Magnesium alloys are among the lightest structural materials known and are of considerable technological interest. To develop superior magnesium alloys, experimentalists must have a thorough understanding of the concentration-dependent precipitates that form in a given system, and hence, the thermodynamic stability of crystal phases must be determined. This information is often lacking but can be supplied by first-principles methods. Within the high-throughput framework, AFLOW, T = 0 K ground-state predictions are made by scanning a large set of known candidate structures for thermodynamic (formation energy) minima. The following 34 systems are investigated: AlMg, AuMg, CaMg, CdMg, CuMg, FeMg , GeMg, …