Physics and Engineering of Nanodevices
Group Leader: Sergio Valenzuela
Group Leader
Sergio Valenzuela obtained his PhD in Physics in 2001 at the Universidad de Buenos Aires (Argentina) and held research positions at Harvard University and the Massachusetts Institute of Technology (MIT). Since July 2008 he has been an ICREA Research Professor and leader of the ICN2 Physics and Engineering of Nanodevices Group. His research is focused on the unique properties of materials with nanoscale dimensions, motivated by both their intrinsic scientific interest and their potential for advanced electronic applications. His work encompasses spintronics, quantum computation with superconducting circuits and quantum metrology. Together with his collaborators, he has pioneered the use of non- local devices to study the spin Hall effect and of thermopiles to isolate the magnon drag in ferromagnetic materials, and he has implemented novel qubit control and spectroscopy methods.
Prof. Valenzuela was awarded the 2001 Giambiagi Prize and the 2009 IUPAP Young Scientist Prize in Magnetism for his contributions to the field of spintronics, as well as an ERC Consolidator Grant in 2012. He has authored over 70 articles (Nature, Science, Reviews of Modern Physics, Nature Materials, Nature Physics, Nature Nanotechnology, Physical Review Letters, among others), four patents, and five books or book chapters
Publications
2024
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Spin-Orbit Torques and Magnetization Switching in (Bi,Sb)2Te3/Fe3GeTe2 Heterostructures Grown by Molecular Beam Epitaxy
Guillet, Thomas; Galceran, Regina; Sierra, Juan F; Belarre, Francisco J; Ballesteros, Belen; Costache, Marius V; Dosenovic, Djordje; Okuno, Hanako; Marty, Alain; Jamet, Matthieu; Bonell, Frederic; Valenzuela, Sergio O Nano Letters; 24 (3): 822 - 828. 2024. 10.1021/acs.nanolett.3c03291. IF: 9.600
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Spintronics with two-dimensional materials and van der Waals heterostructures
Roche, Stephan; van Wees, Bart; Garello, Kevin; Valenzuela, Sergio O 2d Materials; 11 (4): 043001. 2024. 10.1088/2053-1583/ad64e2. IF: 4.500
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Terahertz spin-light coupling in proximitized Dirac materials
Konstantin Denisov; I. V. Rozhansky; Sergio O. Valenzuela; Igor Žutić Physical Review. B./Physical Review. b; 109 (20) 2024. 10.1103/physrevb.109.l201406.
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Unravelling the origin of thermal anisotropy in PdSe2
Xu, Kai; Armesto, Luis Martinez; Svetlik, Josef; Sierra, Juan F; Marinova, Vera; Dimitrov, Dimitre; Goni, Alejandro R; Krysztofik, Adam; Graczykowski, Bartlomiej; Rurali, Riccardo; Valenzuela, Sergio O; Reparaz, Juan Sebastian 2d Materials; 11 (4): 045006. 2024. 10.1088/2053-1583/ad64e3. IF: 4.500
2023
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Efficient terahertz harmonic generation in topological metamaterials
Kovalev, S; Tielrooij, K; Ilyakov, I; Deinert, JC; de Oliveira, T; Ponomaryov, O; Principi, A; Reig, D; Block, A; Varghese, S; Schreyeck, S; Brunner, K; Karczewski, G; Carbonell, C; Valenzuela, S; Molenkamp, L; Kiessling, T; Astakhov, GV International Conference On Infrared, Millimeter, And Terahertz Waves, Irmmw-Thz; 2023. 10.1109/IRMMW-THz57677.2023.10298895.
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Experimental Demonstration of a Magnetically Induced Warping Transition in a Topological Insulator Mediated by Rare-Earth Surface Dopants
Cano, BM; Ferreiros, Y; Pantaleon, PA; Dai, J; Tallarida, M; Figueroa, AI; Marinova, V; Garcia-Diez, K; Mugarza, A; Valenzuela, SO; Miranda, R; Camarero, J; Guinea, F; Silva-Guillen, JA; Valbuena, MA Nano Letters; 23 (13): 6249 - 6258. 2023. 10.1021/acs.nanolett.3c00587. IF: 10.800
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Large-Area Synthesis of Ferromagnetic Fe5-xGeTe2/Graphene van der Waals Heterostructures with Curie Temperature above Room Temperature
Lv, H; da Silva, A; Figueroa, AI; Guillemard, C; Aguirre, IF; Camosi, L; Aballe, L; Valvidares, M; Valenzuela, SO; Schubert, J; Schmidbauer, M; Herfort, J; Hanke, M; Trampert, A; Engel-Herbert, R; Ramsteiner, M; Lopes, JMJ Small; 19 (39) 2023. 10.1002/smll.202302387. IF: 13.300
2022
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Heat dissipation in few-layer MoS2and MoS2/hBN heterostructure
Arrighi A., Del Corro E., Urrios D.N., Costache M.V., Sierra J.F., Watanabe K., Taniguchi T., Garrido J.A., Valenzuela S.O., Sotomayor Torres C.M., Sledzinska M. 2D Materials; 9 (1, 015005) 2022. 10.1088/2053-1583/ac2e51. IF: 7.103
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Milliwatt terahertz harmonic generation from topological insulator metamaterials
Tielrooij KJ; Principi A; Reig DS; Block A; Varghese S; Schreyeck S; Brunner K; Karczewski G; Ilyakov I; Ponomaryov O; de Oliveira TVAG; Chen M; Deinert JC; Carbonell CG; Valenzuela SO; Molenkamp LW; Kiessling T; Astakhov GV; Kovalev S Light-Science & Applications; 11 (1) 2022. 10.1038/s41377-022-01008-y. IF: 20.257
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Passivation of Bi2Te3 Topological Insulator by Transferred CVD-Graphene: Toward Intermixing-Free Interfaces
Galceran, R; Bonell, F; Camosi, L; Sauthier, G; Gebeyehu, ZM; Esplandiu, MJ; Arrighi, A; Aguirre, IF; Figueroa, AI; Sierra, JF; Valenzuela, SO Advanced Materials Interfaces; 9 (36) 2022. 10.1002/admi.202201997. IF: 6.389
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Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry
Camosi L., Světl’ík J., Costache M.V., Savero Torres W., Fernández Aguirre I., Marinova V., Dimitrov D., Gospodinov M., Sierra J.F., Valenzuela S.O. 2D Materials; 9 (3, 035014) 2022. 10.1088/2053-1583/ac6fec.
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Two-dimensional materials prospects for non-volatile spintronic memories
Yang H., Valenzuela S.O., Chshiev M., Couet S., Dieny B., Dlubak B., Fert A., Garello K., Jamet M., Jeong D.-E., Lee K., Lee T., Martin M.-B., Kar G.S., Sénéor P., Shin H.-J., Roche S. Nature; 606 (7915): 663 - 673. 2022. 10.1038/s41586-022-04768-0.
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Unraveling Heat Transport and Dissipation in Suspended MoSe2 from Bulk to Monolayer
Saleta Reig D., Varghese S., Farris R., Block A., Mehew J.D., Hellman O., Woźniak P., Sledzinska M., El Sachat A., Chávez-Ángel E., Valenzuela S.O., van Hulst N.F., Ordejón P., Zanolli Z., Sotomayor Torres C.M., Verstraete M.J., Tielrooij K.-J. Advanced Materials; 34 (10, 2108352) 2022. 10.1002/adma.202108352. IF: 30.849
2021
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A valley of opportunities
Torres L.F., Valenzuela S.O. Physics World; 34 (11): 43 - 46. 2021. 10.1088/2058-7058/34/11/40. IF: 0.355
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Control of spin-charge conversion in van der Waals heterostructures
Galceran R., Tian B., Li J., Bonell F., Jamet M., Vergnaud C., Marty A., García J.H., Sierra J.F., Costache M.V., Roche S., Valenzuela S.O., Manchon A., Zhang X., Schwingenschlögl U. APL Materials; 9 (10, 100901) 2021. 10.1063/5.0054865. IF: 5.096
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Large-area van der Waals epitaxy and magnetic characterization of Fe3GeTe2films on graphene
Lopes J.M.J., Czubak D., Zallo E., Figueroa A.I., Guillemard C., Valvidares M., Rubio-Zuazo J., López-Sanchéz J., Valenzuela S.O., Hanke M., Ramsteiner M. 2D Materials; 8 (4, 041001) 2021. 10.1088/2053-1583/ac171d. IF: 7.103
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Low-symmetry topological materials for large charge-to-spin interconversion: The case of transition metal dichalcogenide monolayers
Vila M., Hsu C.-H., Garcia J.H., Benítez L.A., Waintal X., Valenzuela S.O., Pereira V.M., Roche S. Physical Review Research; 3 (4, 043230) 2021. 10.1103/PhysRevResearch.3.043230. IF: 0.000
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Van der Waals heterostructures for spintronics and opto-spintronics
Sierra J.F., Fabian J., Kawakami R.K., Roche S., Valenzuela S.O. Nature Nanotechnology; 16 (8): 856 - 868. 2021. 10.1038/s41565-021-00936-x. IF: 39.213
2020
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Absence of Magnetic Proximity Effect at the Interface of Bi2Se3 and (Bi,Sb)2Te3 with EuS
Figueroa A.I., Bonell F., Cuxart M.G., Valvidares M., Gargiani P., Van Der Laan G., Mugarza A., Valenzuela S.O. Physical Review Letters; 125 (22, 226801) 2020. 10.1103/PhysRevLett.125.226801. IF: 8.385
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Control of Spin-Orbit Torques by Interface Engineering in Topological Insulator Heterostructures
Bonell F., Goto M., Sauthier G., Sierra J.F., Figueroa A.I., Costache M.V., Miwa S., Suzuki Y., Valenzuela S.O. Nano Letters; 20 (8): 5893 - 5899. 2020. 10.1021/acs.nanolett.0c01850. IF: 11.238
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Ferromagnetic Resonance Assisted Optomechanical Magnetometer
Colombano M.F., Arregui G., Bonell F., Capuj N.E., Chavez-Angel E., Pitanti A., Valenzuela S.O., Sotomayor-Torres C.M., Navarro-Urrios D., Costache M.V. Physical Review Letters; 125 (14, 147201) 2020. 10.1103/PhysRevLett.125.147201. IF: 8.385
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Magnetism, spin dynamics, and quantum transport in two-dimensional systems
Savero Torres W., Sierra J.F., Benítez L.A., Bonell F., García J.H., Roche S., Valenzuela S.O. MRS Bulletin; 45 (5): 357 - 365. 2020. 10.1557/mrs.2020.121. IF: 5.061
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Molecular Approach for Engineering Interfacial Interactions in Magnetic/Topological Insulator Heterostructures
Cuxart M.G., Valbuena M.A., Robles R., Moreno C., Bonell F., Sauthier G., Imaz I., Xu H., Nistor C., Barla A., Gargiani P., Valvidares M., Maspoch D., Gambardella P., Valenzuela S.O., Mugarza A. ACS Nano; 14 (5): 6285 - 6294. 2020. 10.1021/acsnano.0c02498. IF: 14.588
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Opportunities and challenges for spintronics in the microelectronics industry
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., Onbaşlı M.C., d’Aquino M., Prenat G., Finocchio G., Lopez-Diaz L., Chantrell R., Chubykalo-Fesenko O., Bortolotti P. Nature Electronics; 3 (8): 446 - 459. 2020. 10.1038/s41928-020-0461-5. IF: 27.500
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The 2021 quantum materials roadmap
Giustino F., Lee J.H., Trier F., Bibes M., Winter S.M., Valentí R., Son Y.-W., Taillefer L., Heil C., Figueroa A.I., Plaçais B., Wu Q., Yazyev O.V., Bakkers E.P.A.M., Nygård J., Forn-Díaz P., de Franceschi S., McIver J.W., Foa Torres L.E.F., Low T., Kumar A., Galceran R., Valenzuela S.O., Costache M.V., Manchon A., Kim E.-A., Schleder G.R., Fazzio A., Roche S. JPhys Materials; 3 (4, 042006) 2020. 10.1088/2515-7639/abb74e. IF: 0.000
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Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures
Benítez L.A., Savero Torres W., Sierra J.F., Timmermans M., Garcia J.H., Roche S., Costache M.V., Valenzuela S.O. Nature Materials; 19 (2): 170 - 175. 2020. 10.1038/s41563-019-0575-1. IF: 38.663
2019
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Investigating the spin-orbit interaction in van der Waals heterostructures by means of the spin relaxation anisotropy
Benítez L.A., Sierra J.F., Savero Torres W., Timmermans M., Costache M.V., Valenzuela S.O. APL Materials; 7 (12, 120701) 2019. 10.1063/1.5124894. IF: 4.296
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Spin communication over 30 μm long channels of chemical vapor deposited graphene on SiO2
Gebeyehu Z.M., Parui S., Sierra J.F., Timmermans M., Esplandiu M.J., Brems S., Huyghebaert C., Garello K., Costache M.V., Valenzuela S.O. 2D Materials; 6 (3, 034003) 2019. 10.1088/2053-1583/ab1874. IF: 7.343
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The phase diagram of 2D antiferromagnets
Valenzuela S.O., Roche S. Nature Nanotechnology; 14 (12): 1088 - 1089. 2019. 10.1038/s41565-019-0592-x. IF: 33.407
2018
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A barrier to spin filters
Valenzuela S.O., Roche S. Nature Electronics; 1 (6): 328 - 329. 2018. 10.1038/s41928-018-0089-x.
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Bottom-up synthesis of multifunctional nanoporous graphene
Moreno C., Vilas-Varela M., Kretz B., Garcia-Lekue A., Costache M.V., Paradinas M., Panighel M., Ceballos G., Valenzuela S.O., Peña D., Mugarza A. Science; 360 (6385): 199 - 203. 2018. 10.1126/science.aar2009. IF: 41.058
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Impact of the: In situ rise in hydrogen partial pressure on graphene shape evolution during CVD growth of graphene
Gebeyehu Z.M., Arrighi A., Costache M.V., Sotomayor-Torres C.M., Esplandiu M.J., Valenzuela S.O. RSC Advances; 8 (15): 8234 - 8239. 2018. 10.1039/c7ra13169k. IF: 2.936
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Strongly anisotropic spin relaxation in graphene-transition metal dichalcogenide heterostructures at room temperature
Benítez L.A., Sierra J.F., Savero Torres W., Arrighi A., Bonell F., Costache M.V., Valenzuela S.O. Nature Physics; 14 (3): 303 - 308. 2018. 10.1038/s41567-017-0019-2. IF: 22.727
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Thermoelectric spin voltage in graphene
Sierra J.F., Neumann I., Cuppens J., Raes B., Costache M.V., Valenzuela S.O. Nature Nanotechnology; 13 (2): 107 - 111. 2018. 10.1038/s41565-017-0015-9. IF: 37.490
2017
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Experimental observation of the spin hall effect using electronic nonlocal detection
Valenzuela S.O., Kimura T. Spin Current; : 247 - 263. 2017. 10.1093/oso/9780198787075.003.0014.
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Graphene spintronics
Cummings A.W., Valenzuela S.O., Ortmann F., Roche S. 2D Materials: Properties and Devices; : 197 - 218. 2017. 10.1017/9781316681619.012.
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Growth of Twin-Free and Low-Doped Topological Insulators on BaF2(111)
Bonell F., Cuxart M.G., Song K., Robles R., Ordejón P., Roche S., Mugarza A., Valenzuela S.O. Crystal Growth and Design; 17 (9): 4655 - 4660. 2017. 10.1021/acs.cgd.7b00525. IF: 4.055
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Introduction
Valenzuela S.O. Spin Current; : 187 - 207. 2017. 10.1093/oso/9780198787075.003.0011.
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Spin Current
Maekawa S., Valenzuela S.O., Saitoh E., Kimura T. Spin Current; : 1 - 520. 2017. 10.1093/oso/9780198787075.001.0001.
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Spin precession in anisotropic media
Raes B., Cummings A.W., Bonell F., Costache M.V., Sierra J.F., Roche S., Valenzuela S.O. Physical Review B; 95 (8, 085403) 2017. 10.1103/PhysRevB.95.085403. IF: 3.836
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The 2017 Magnetism Roadmap
Sander D., Valenzuela S.O., Makarov D., Marrows C.H., Fullerton E.E., Fischer P., McCord J., Vavassori P., Mangin S., Pirro P., Hillebrands B., Kent A.D., Jungwirth T., Gutfleisch O., Kim C.G., Berger A. Journal of Physics D: Applied Physics; 50 (36, 363001) 2017. 10.1088/1361-6463/aa81a1. IF: 2.588
2016
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Determination of the spin-lifetime anisotropy in graphene using oblique spin precession
Raes B., Scheerder J.E., Costache M.V., Bonell F., Sierra J.F., Cuppens J., Van De Vondel J., Valenzuela S.O. Nature Communications; 7 ( 11444) 2016. 10.1038/ncomms11444. IF: 11.329
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Spin Hall Effect and Origins of Nonlocal Resistance in Adatom-Decorated Graphene
Van Tuan D., Marmolejo-Tejada J.M., Waintal X., Nikolić B.K., Valenzuela S.O., Roche S. Physical Review Letters; 117 (17, 176602) 2016. 10.1103/PhysRevLett.117.176602. IF: 7.645
2015
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Graphene spintronics: The European Flagship perspective
Roche S., Åkerman J., Beschoten B., Charlier J.-C., Chshiev M., Dash S.P., Dlubak B., Fabian J., Fert A., Guimarães M., Guinea F., Grigorieva I., Schönenberger C., Seneor P., Stampfer C., Valenzuela S.O., Waintal X., Van Wees B. 2D Materials; 2 (3, 030202) 2015. 10.1088/2053-1583/2/3/030202. IF: 0.000
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Hot-Carrier Seebeck Effect: Diffusion and Remote Detection of Hot Carriers in Graphene
Sierra J.F., Neumann I., Costache M.V., Valenzuela S.O. Nano Letters; 15 (6): 4000 - 4005. 2015. 10.1021/acs.nanolett.5b00922. IF: 13.592
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Quantum Spin Hall Effect and Topological Insulators
Ortmann F., Roche S., Valenzuela S.O. Topological Insulators: Fundamentals and Perspectives; : 3 - 10. 2015. 10.1002/9783527681594.ch1.
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Spin Hall effects
Sinova J., Valenzuela S.O., Wunderlich J., Back C.H., Jungwirth T. Reviews of Modern Physics; 87 (4): 1213 - 1260. 2015. 10.1103/RevModPhys.87.1213. IF: 29.604
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Topological Insulators: Fundamentals and Perspectives
Ortmann F., Roche S., Valenzuela S.O. Topological Insulators: Fundamentals and Perspectives; : 1 - 407. 2015. 10.1002/9783527681594.
2014
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Fingerprints of inelastic transport at the surface of the topological insulator Bi 2 Se 3: Role of electron-phonon coupling
Costache, M.V.; Neumann, I.; Sierra, J.F.; Marinova, V.; Gospodinov, M.M.; Roche, S.; Valenzuela, S.O. Physical Review Letters; 2014. 10.1103/PhysRevLett.112.086601. IF: 7.728
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Graphene spintronics: Puzzling controversies and challenges for spin manipulation
Roche, S.; Valenzuela, S.O. Journal of Physics D - Applied Physics; 2014. 10.1088/0022-3727/47/9/094011. IF: 2.521
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Pseudospin-driven spin relaxation mechanism in graphene
Tuan, D.V.; Ortmann, F.; Soriano, D.; Valenzuela, S.O.; Roche, S. Nature Physics; 10 (11): 857 - 863. 2014. 10.1038/nphys3083. IF: 20.603
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Thermal Energy Harvesting
Mouis M., Chávez-Ángel E., Sotomayor-Torres C., Alzina F., Costache M.V., Nassiopoulou A.G., Valalaki K., Hourdakis E., Valenzuela S.O., Viala B., Zakharov D., Shchepetov A., Ahopelto J. Beyond CMOS Nanodevices 1; 9781848216549: 135 - 219. 2014. 10.1002/9781118984772.ch7.
2013
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Electrical detection of spin precession in freely suspended graphene spin valves on cross-linked poly(methyl methacrylate)
Neumann, I.; Van De Vondel, J.; Bridoux, G.; Costache, M.V.; Alzina, F.; Torres, C.M.S.; Valenzuela, S.O. Small; 9 (1): 156 - 160. 2013. 10.1002/smll.201201194. IF: 7.823
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Enhanced spin accumulation at room temperature in graphene spin valves with amorphous carbon interfacial layers
Neumann, I.; Costache, M.V.; Bridoux, G.; Sierra, J.F.; Valenzuela, S.O. Applied Physics Letters; 2013. 10.1063/1.4820586. IF: 3.794
2012
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Lateral metallic devices made by a multiangle shadow evaporation technique
Costache, M.V.; Bridoux, G.; Neumann, I.; Valenzuela, S.O. Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures; 30: 4. 2012. .
2011
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Enhanced spin signal in nonlocal devices based on a ferromagnetic CoFeAl alloy
Bridoux, G.; Costache, M. V.; Van de Vondel, J. ; Neumann, I.; Valenzuela, S. O. Applied Physics Letters; 2011. .
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Generation of pure spin currents in a single electron transistor with a superconducting island
Costache, M.V.; Valenzuela, S.O. Proceedings of SPIE - The International Society for Optical Engineering; 2011. 10.1117/12.890231 .
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Magnon-drag thermopile
Costache, M.V.; Bridoux, G.; Neumann, I.; Valenzuela, S.O. Nature Materials; 2011. .
2010
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Experimental spin ratchet
Costache, M.V.; Valenzuela, S.O. SCIENCE; 330: 1645 - 1648. 2010. 10.1126/science.1196228.
2009
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Large-amplitude driving of a superconducting artificial atom : IIInterferometry, cooling, and amplitude spectroscopy
Oliver, W.D.; Valenzuela, S.O. Quantum Information Processing; 8: 261 - 281. 2009. 10.1007/s11128-009-0108-y.
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Nonlocal electronic spin detection, spin accumulation and the spin hall effect
Valenzuela, S.O. International Journal of Modern Physics B; 23: 2413 - 2438. 2009. 10.1142/S021797920905290X.
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Pulse imaging and nonadiabatic control of solid-state artificial atoms
Bylander, J.; Rudner, M.S.; Shytov, A.V.; Valenzuela, S.O.; Berns, D.M.; Berggren, K.K.; Levitov, L.S.; Oliver, W.D. Physical Review B - Condensed Matter and Materials Physics; 80 2009. 10.1103/PhysRevB.80.220506.
2008
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Amplitude spectroscopy of a solid-state artificial atom
D.M. Berns; M.S. Rudner; S.O. Valenzuela; K.K. Berggren; W.D. Oliver; L.S. Levitov; T.P. Orlando Nature; 455: 51 - 57. 2008. 10.1038/nature07262.
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Microwave-induced cooling of a superconducting qubit
S.O. Valenzuela; W.D. Oliver; D.M. Berns; K.K. Berggren; L.S. Levitov; T.P. Orlando Science; 314 (5805): 1589 - 1592. 2008. 10.1126/science.1134008 .
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Quantum Phase Tomography of a Strongly Driven Qubit
M.S. Rudner; A.V. Shytov; L.S. Levitov; D. M. Berns; W.D. Oliver; S.O. Valenzuela; T.P. Orlando Physical Review Letters; 101: 190502. 2008. 10.1103/PhysRevLett.101.190502.