Journal
NANO LETTERS
Volume 14, Issue 11, Pages 6510-6514Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl503083q
Keywords
Topological insulator; nanoplate; magnetoresistance; granularity; thin film
Categories
Funding
- NSF CAREER Award program [DMR-1151534]
- Lee Hsun Young Scientist Award of IMR, Chinese Academy of Sciences
- National Natural Science Foundation of China [51331006]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1151534] Funding Source: National Science Foundation
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We report on the magnetotransport properties of chemical vapor deposition grown films of interconnected Bi2Te3 nanoplates. Similar to many other topological insulator (TI) materials, these granular Bi2Te3 films exhibit a linear magnetoresistance (LMR) effect which has received much recent attention. Studying samples with different degree of granularity, we find a universal correlation between the magnitude of the LMR and the average mobility (mu) of the films over nearly 2 orders of magnitude change of mu . The granularity controlled LMR effect here is attributed to the mobility fluctuation induced classical LMR according to the Parish-Littlewood theory. These findings have implications to both the fundamental understanding and magnetoresistive device applications of TI and small bandgap semiconductor materials.
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