51 citations · 184 across the 9 of their papers we have counts for
9 papers
Surface-dominant transport in Weyl semimetal NbAs nanowires for next-generation interconnects
Yeryun Cheon, Mehrdad T. Kiani, Yi-Hsin Tu +20
Ongoing demands for smaller and more energy efficient electronic devices necessitate alternative interconnect materials with lower electrical resistivity at reduced dimensions. Des…
Microscopic Dynamics of Li in Rutile TiO Revealed by Li -detected NMR
Ryan M. L. McFadden, Terry J. Buck, Aris Chatzichristos +19
We report measurements of the dynamics of isolated Li in single crystal rutile TiO using -detected NMR. From spin-lattice relaxation and motional narrowing, we…
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…
A combined NMR and DFT study of Narrow Gap Semiconductors: The case of PbTe
Robert E. Taylor, Fahri Alkan, Dimitrios Koumoulis +4
In this study we present an alternative approach to separating contributions to the NMR shift originating from the Knight shift and chemical shielding by a combination of experimen…
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.…
NMR study of native defects in PbSe
Dimitrios Koumoulis, Robert E. Taylor, Danny King +1
While each atom species in PbSe corresponds to a single crystallographic site and transport measurements reveal a single carrier density, Pb NMR reveals a more complicated…
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…
Two Band Model Interpretation of the p to n Transition in Ternary Tetradymite Topological Insulators
T. C. Chasapis, D. Koumoulis, B. Leung +5
The requirement for large bulk resistivity in topological insulators has led to the design of complex ternary and quaternary phases with balanced donor and acceptor levels. A commo…
NMR Probe of Metallic States in Nanoscale Topological Insulators
Dimitrios Koumoulis, Thomas C. Chasapis, Robert E. Taylor +6
A 125Te NMR study of bismuth telluride nanoparticles as function of particle size revealed that the spin-lattice relaxation is enhanced below 33 nm, accompanied by a transition of…