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Investigation of electronic and topological properties of superconductor-graphene heterojunctions for applications in quantum computation devices

Grant number: 16/10167-8
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): November 01, 2016
Effective date (End): June 30, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Durval Rodrigues Junior
Grantee:Antonio Lucas Rigotti Manesco
Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
Associated scholarship(s):19/07082-9 - Physics of graphene/superconductor junctions, BE.EP.DD


In recent years, the search for quantum computation devices has become increasingly intense. In this context, systems with particles (or quasi-particles) that exhibit non-abelian anionic statistics have proved to be important candidates for these applications, and we can point out systems that can host Majorana fermions. In condensed matter systems, Majorana fermions appear in interfaces between topological superconductors and regions with trivial gap, where there is a change in sign of the effective mass in the Dirac equation, that is intensively used to represent the continuum limit of such systems. On the other side, the limitation of the number of materials that can exhibit topological superconductivity intrinsically (p-wave superconductors) leads to the necessity of thinking in alternative paths with artificial systems that presents topological superconductivity. In that point, the experimental challenges are huge, in the sense that the majority of the systems that can exhibit the phenomena require high values of spin-orbit coupling and need to guarantee time-reversal symmetry, that is easily broken by magnetic impurities. In that context, the present work looks for an alternative path to create systems that can host Majorana fermions: junctions of graphene in quantum Hall state and conventional superconductors (s-wave). The project also looks up to systems never studied according to the literature: junctions using double-gap superconductors and different geometries, including the inclusion of artificial pinning centers for vortices, that could lead to different localizations of the Majorana states in the systems. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MANESCO, A. L. R.; LADO, J. L.; RIBEIRO, E. V. S.; WEBER, G.; RODRIGUES JR, D. Correlations in the elastic Landau level of spontaneously buckled graphene. 2D MATERIALS, v. 8, n. 1 JAN 2021. Web of Science Citations: 0.
BHATTACHARYYA, A.; FERREIRA, R. P.; SANTOS, F. B.; ADROJA, D. T.; LORD, J. S.; CORREA, L. E.; MACHADO, A. J. S.; MANESCO, A. L. R.; ELENO, L. T. F. Two-band superconductivity with unconventional pairing symmetry in HfV2Ga4. PHYSICAL REVIEW RESEARCH, v. 2, n. 2 APR 1 2020. Web of Science Citations: 0.
MANESCO, A. L. R.; WEBER, G.; RODRIGUES JR, D. Effective model for Majorana modes in graphene. Physical Review B, v. 100, n. 12 SEP 9 2019. Web of Science Citations: 0.
DE LIMA, B. S.; DE CASSIA, R. R.; SANTOS, F. B.; CORREA, L. E.; GRANT, T. W.; MANESCO, A. L. R.; MARTINS, G. W.; ELENO, L. T. F.; TORIKACHVILI, M. S.; MACHADO, A. J. S. Properties and superconductivity in Ti-doped NiTe2 single crystals. Solid State Communications, v. 283, p. 27-31, NOV 2018. Web of Science Citations: 0.
MANESCO, ANTONIO L. R.; WEBER, GABRIEL; RODRIGUES, JR., DURVAL. One-Dimensional p-Wave Superconductor Toy-Model for Majorana Fermions in Multiband Semiconductor Nanowires. IEEE Transactions on Applied Superconductivity, v. 28, n. 4 JUN 2018. Web of Science Citations: 2.
MANESCO, ANTONIO L. R.; WEBER, GABRIEL; RODRIGUES, JR., DURVAL. Hidden chiral symmetries in BDI multichannel Kitaev chains. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 30, n. 17 MAY 2 2018. Web of Science Citations: 1.

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