Sergio O. Valenzuela

Sergio O. Valenzuela

Institut Català de Nanociència i Nanotecnologia

Engineering Sciences

Sergio O. Valenzuela is an ICREA Prof. at the Catalan Institute of Nanoscience and Nanotechnology (ICN2), The Barcelona Institute of Science and Technology. He leads the Physics and Engineering of Nanodevices group, which focuses on quantum transport, spintronics, and thermoelectricity in materials such as graphene and topological insulators. He has pioneered the use of nonlocal devices to study the spin Hall effect, thermopiles to isolate the magnon drag in ferromagnetic materials, and implemented novel qubit control and spectroscopy methods. Prof. Valenzuela received a PhD in Physics at the University of Buenos Aires, and held research positions at Harvard University and MIT. He is recipient of the Giambiagi prize, the IUPAP Young Scientist Prize and a ERC Consolidator Grant. He is also Principal Investigator of the Graphene Flagship and Grantor of the ICN2 “Severo Ochoa” Centre of Excellence Project.

Research interests

In recent years, electronic devices have been scaled down to nanoscale sizes where quantum effects begin to interfere with their functioning. Materials and devices in such scales often present unexpected and counterintuitive physical properties. Prof. Valenzuela's Group focus is the development of novel devices, which are designed to gain insight of specific physical properties of the system components, relevant both for fundamental reasons and applications at the nanoscale. The current research interests of the group span Spintronics, Spin Caloritronics, and quantum transport in particular in graphene and topological insulators. For more information see:

Selected publications

- Benítez, L.A., Savero Torres, W., Sierra, J.F., M. Timmermans, J. H. García, S. Roche, M. V. Costache and S. O. Valenzuela 2020,  "Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures". Nature Mater. 19, 170.

- Figueroa, A I; Bonell, F; Cuxart, M G; Valvidares, M; Gargiani, P; van der Laan, G; Mugarza, A; Valenzuela, S O 2020, 'Absence of Magnetic Proximity Effect at the Interface of Bi2Se3 and (Bi,Sb)2Te3 with EuS.', Physical Review Letters, 125, 22, 226801.

- Bonell, Frederic; Goto, Minori; Sauthier, Guillaume; Sierra, Juan F.; Figueroa, Adriana, I; Costache, Marius, V; Miwa, Shinji; Suzuki, Yoshishige; Valenzuela, Sergio O. 2020, 'Control of Spin-Orbit Torques by Interface Engineering in Topological Insulator Heterostructures', Nano Letters, 20, 8, 5893 - 5899.

- Dieny, B.; Prejbeanu, I. L.; Garello, K.; Gambardella, P.; Freitas, P.; Lehndorff, R.; Raberg, W.; Ebels, U.; Demokritov, S. O.; Akerman, J.; Deac, A.; Pirro, P.; Adelmann, C.; Anane, A.; Chumak, A. V.; Hirohata, A.; Mangin, S.; Valenzuela, S. O.; Onbasli, M. Cengiz; D'Aquino, M.; Prenat, G.; Finocchio, G.; Lopez-Diaz, L.; Chantrell, R.; Chubykalo-Fesenko, O.; Bortolotti, P. 2020, 'Opportunities and challenges for spintronics in the microelectronics industry', Nature Electronics, 3, 8, 446 - 459.

- Cuxart, M.G.; Valbuena, M.A. ; Robles, R.; Moreno, C.; Bonell, F.; Sauthier, G.; Imaz, I.; Xu, H.g; Nistor, C.; Barla, A.; Gargiani, P.; Valvidares, M.; Maspoch, D.; Gambardella, P.; Valenzuela, S. O.; Mugarza, A. 2020, 'Molecular Approach for Engineering Interfacial Interactions in Magnetic/Topological Insulator Heterostructures', ACS Nano, 14, 5, 6285 - 6294.

- Savero Torres, W.; Sierra, J. F.; Benitez, L. A.; Bonell, F.; Garcia, J. H.; Roche, S.; Valenzuela, S. O. 2020, 'Magnetism, spin dynamics, and quantum transport in two-dimensional systems', MRS Bulletin, 45, 5, 357 - 365.

Selected research activities

Coordinator of FET-PROACTIVE Project "TOCHA".