@article{ISI:000402034400019,
 abstract = {We demonstrate experimentally that a macroscopic topological insulator
(TI) phase can emerge in a granular conductor composed of an assembly of
tunnel coupled TI nanocrystals of dimension similar to 10 nm x 10 nm x 2
nm. Electrical transport measurements on thin films of Bi2Se3
nanocrystals reveal the presence of decoupled top and bottom topological
surface states that exhibit large surface state penetration depths
(similar to 30 nm at 2 K). By tuning the size of the nanocrystals and
the couplings between them, this new class of TIs may be readily tuned
from a non-topological to a topological insulator phase, that too with
designer properties. Paradoxically, this seemingly `dirty' system
displays properties that are closer to an ideal TI than most known
single crystal systems, making granular/nanocrystalline TIs an
attractive platform for future TI research.},
 author = {Banerjee, Abhishek and Deb, Oindrila and Majhi, Kunjalata and Ganesan,
R. and Sen, Diptiman and Kumar, P. S. Anil},
 doi = {10.1039/c7nr01355h},
 eissn = {2040-3372},
 issn = {2040-3364},
 journal = {NANOSCALE},
 month = {MAY 28},
 number = {20},
 orcid-numbers = {Kumar, P S Anil/0000-0002-4574-0868},
 pages = {6755-6764},
 researcherid-numbers = {Deb, Oindrila/AAV-6760-2020
Kumar, P S Anil/A-5634-2008},
 times-cited = {12},
 title = {Granular topological insulators},
 unique-id = {ISI:000402034400019},
 volume = {9},
 year = {2017}
}