51 citations · 184 across the 9 of their papers we have counts for
6 papers · 1 filter
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…