Localization and Directionality of Surface Transport in Bi<sub>2</sub>Te<sub>3</sub> Ordered 3D Nanonetworks.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37410703.
- Also identified by DOI 10.1021/acsnano.3c04160 and PMC identifier 10510701.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The resistance of an ordered 3D-Bi<sub>2</sub>Te<sub>3</sub> nanowire nanonetwork was studied at low temperatures. Below 50 K the increase in resistance was found to be compatible with the Anderson model for localization, considering that conduction takes place in individual parallel channels across the whole sample. Angle-dependent magnetoresistance measurements showed a distinctive weak antilocalization characteristic with a double feature that we could associate with transport along two perpendicular directions, dictated by the spatial arrangement of the nanowires. The coherence length obtained from the Hikami-Larkin-Nagaoka model was about 700 nm across transversal nanowires, which corresponded to approximately 10 nanowire junctions. Along the individual nanowires, the coherence length was greatly reduced to about 100 nm. The observed localization effects could be the reason for the enhancement of the Seebeck coefficient observed in the 3D-Bi<sub>2</sub>Te<sub>3</sub> nanowire nanonetwork compared to individual nanowires.