NMR probe of metallic states in nanoscale topological insulators

Dimitrios Koumoulis; Thomas C. Chasapis; Robert E. Taylor; Michael P. Lake; Danny King; Nanette N. Jarenwattananon; Gregory A. Fiete; Mercouri G. Kanatzidis; Louis S. Bouchard

doi:10.1103/PhysRevLett.110.026602

NMR probe of metallic states in nanoscale topological insulators

Dimitrios Koumoulis, Thomas C. Chasapis, Robert E. Taylor, Michael P. Lake, Danny King, Nanette N. Jarenwattananon, Gregory A. Fiete, Mercouri G. Kanatzidis, Louis S. Bouchard

Northwestern University

Research output: Contribution to journal › Article

35 Citations (Scopus)

Abstract

A Te125 NMR study of bismuth telluride nanoparticles as a function of particle size revealed that the spin-lattice relaxation is enhanced below 33 nm, accompanied by a transition of NMR spectra from the single to the bimodal regime. The satellite peak features a negative Knight shift and higher relaxivity, consistent with core polarization from p-band carriers. Whereas nanocrystals follow a Korringa law in the range 140-420 K, micrometer particles do so only below 200 K. The results reveal increased metallicity of these nanoscale topological insulators in the limit of higher surface-to-volume ratios.

Original language	English
Article number	026602
Journal	Physical review letters
Volume	110
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.110.026602
Publication status	Published - Jan 9 2013

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ASJC Scopus subject areas

Physics and Astronomy(all)

Cite this

Koumoulis, D., Chasapis, T. C., Taylor, R. E., Lake, M. P., King, D., Jarenwattananon, N. N., Fiete, G. A., Kanatzidis, M. G., & Bouchard, L. S. (2013). NMR probe of metallic states in nanoscale topological insulators. Physical review letters, 110(2), [026602]. https://doi.org/10.1103/PhysRevLett.110.026602

NMR probe of metallic states in nanoscale topological insulators. / Koumoulis, Dimitrios; Chasapis, Thomas C.; Taylor, Robert E.; Lake, Michael P.; King, Danny; Jarenwattananon, Nanette N.; Fiete, Gregory A.; Kanatzidis, Mercouri G.; Bouchard, Louis S.

In: Physical review letters, Vol. 110, No. 2, 026602, 09.01.2013.

Research output: Contribution to journal › Article

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10.1103/PhysRevLett.110.026602