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- Fermi National Accelerator LaboratoryUS496 papers
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67 papers · 1 filter
New Chiral Fermions, a New Gauge Interaction, Dirac Neutrinos, and Dark Matter
André de Gouvea, Daniel Hernandez
We propose that all light fermionic degrees of freedom, including the Standard Model (SM) fermions and all possible light beyond-the-standard-model fields, are chiral with respect…
Nanoscale -Nuclear Magnetic Resonance Depth Imaging of Topological Insulators
Dimitrios Koumoulis, Gerald D. Morris, Liang He +8
Considerable evidence suggests that variations in the properties of topological insulators (TIs) at the nanoscale and at interfaces can strongly affect the physics of topological m…
Understanding Bulk Defects in Topological Insulators from Nuclear-Spin Interactions
Dimitrios Koumoulis, Belinda Leung, Thomas C. Chasapis +4
Non-invasive local probes are needed to characterize bulk defects in binary and ternary chalcogenides. These defects contribute to the non-ideal behavior of topological insulators.…
Thermal Maps of Gases in Heterogeneous Reactions
Nanette N. Jarenwattananon, Stefan Gloeggler, Trenton Otto +5
Over 85% of all chemical industry products are made using catalysts, with the overwhelming majority of these employing heterogeneous catalysts functioning at the gas-solid interfac…
Site-Specific Contributions to the Band Inversion in a Topological Crystalline Insulator
Dimitrios Koumoulis, Thomas Christos Chasapis, Belinda Leung +5
In a topological crystalline insulator (TCI) the inversion of the bulk valence and conduction bands is a necessary condition to observe surface metallic states. Solid solutions of…
Extreme eigenvalues of sparse, heavy tailed random matrices
Antonio Auffinger, Si Tang
We study the statistics of the largest eigenvalues of sample covariance matrices when the entries of the matrix a…