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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Graphene kirigami as a platform for stretchable and tunable quantum dot arrays

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Bahamon, D. A. [1] ; Qi, Zenan [2] ; Park, Harold S. [2] ; Pereira, Vitor M. [3, 4] ; Campbell, David K. [5]
Total Authors: 5
[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, Rua Consolacao 896, BR-01302907 Sao Paulo, SP - Brazil
[2] Boston Univ, Dept Mech Engn, Boston, MA 02215 - USA
[3] Natl Univ Singapore, Ctr Adv Mat & Graphene Res Ctr 2D, 6 Sci Dr 2, Singapore 117546 - Singapore
[4] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117542 - Singapore
[5] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 - USA
Total Affiliations: 5
Document type: Journal article
Source: Physical Review B; v. 93, n. 23 JUN 6 2016.
Web of Science Citations: 11

The quantum transport properties of a graphene kirigami similar to those studied in recent experiments are calculated in the regime of elastic, reversible deformations. Our results show that, at low electronic densities, the conductance profile of such structures replicates that of a system of coupled quantum dots, characterized by a sequence of minibands and stopgaps. The conductance and I-V curves have different characteristics in the distinct stages of deformation that characterize the elongation of these structures. Notably, the effective coupling between localized states is strongly reduced in the small elongation stage but revived at large elongations that allow the reestablishment of resonant tunneling across the kirigami. This provides an interesting example of interplay between geometry, strain, spatial confinement, and electronic transport. The alternating miniband and stopgap structure in the transmission leads to I-V characteristics with negative differential conductance in well defined energy/doping ranges. These effects should be stable in a realistic scenario that includes edge roughness and Coulomb interactions, as these are expected to further promote localization of states at low energies in narrow segments of graphene nanostructures. (AU)

FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antônio Hélio de Castro Neto
Support type: Research Projects - SPEC Program