@article{ISI:000446901800003,
 abstract = {Since the discovery of graphene, the localization physics has been
studied extensively, and both weak antilocalization (WAL) and weak
localization (WL) have been observed. A graphene superlattice (GSL) with
multiple Dirac cones has emerged as a focus point in condensed-matter
physics in recent years. However, the localization physics at multiple
Dirac cones has not been studied to date. Here, we study the
magnetoconductance in hexagonal boron nitride-graphene
moire-superlattice devices. Our magnetoconductance results show a clear
signature of WL at the cloned Dirac cone (CDC) over one decade of
variation of both carrier concentration and temperature in the two
devices. In contrast, the WAL becomes stronger at the primary Dirac cone
(PDC) with increasing temperature and lower carrier concentration in one
device, in agreement with previous studies, whereas the other device
shows stronger WAL for both lower temperature and carrier concentration.
Since the observation of WAL at PDC is expected in a cleaner device due
to the pi Berry phase, it is natural to ask whether the observation of
WL at CDC in our GSL devices has any connection to Berry phase change or
not. In order to address this issue we measure the Shubnikov-de Haas
(SdH) resistance oscillations, which show a shift of the Berry phase by
pi from PDC to CDC, indicating the role of the Berry phase for observing
WL at CDC. We further corroborate our results with realistic electronic
band structure calculations, which suggest a change in the Fermi surface
topology from that with a small Fermi pocket enclosing a single PDC in
each valley to a large Fermi surface shared by all the CDCs, in
accordance with the change in oscillation frequency from PDC to CDC in
the SdH measurements.},
 article-number = {155408},
 author = {Kumar, Chandan and Srivastav, Saurabh Kumar and Adhikary, Priyo and
Banerjee, Sumilan and Das, Tanmoy and Das, Anindya},
 doi = {10.1103/PhysRevB.98.155408},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {OCT 9},
 number = {15},
 orcid-numbers = {SRIVASTAV, SAURABH/0000-0002-0498-4217},
 title = {Localization physics in graphene moire superlattices},
 unique-id = {ISI:000446901800003},
 volume = {98},
 year = {2018}
}