Oriol T. Valls
Professor, School of Physics and Astronomy
Contact
130-25 John T. Tate Hall
116 Church Street Se
Minneapolis, MN 55455
Affiliations
Oriol T. Valls
Professor, School of Physics and Astronomy
Superconducting and Magnetic Proximity Effects in F/S nanostructures; Exotic forms of superconductivity; Charge and Spin Transport in F/S nanostructures; Superfluid Hydrodynamics; Dynamics of quantum Crystals.
Education
Ph.D., Brown University, 1972-1975
M.Sc., Brown University, 1970-1972
B.Sc., University of Barcelona, 1965-1969
Scientific & Professional Societies
Honors and Awards
Member, Editorial Board , Journal of Controversial Ideas, (2023-)
Editor, Newsletter of the Forum on Physics and Society , (American Physical Society) (2015- )
APS Outstanding Referee Award, 2009
Fellow, American Physical Society, 1998
Fellow, Minnesota Supercomputer Institute, 1989
Selected Publications
2022
Valls, O.T. (2022). Superconductor/ferromagnet nanostructures: An illustration of the physics of hybrid nanomaterials.
DOI: 10.1142/12649
2020
Moen, E., Valls, O.T. (2020). Quasiparticle conductance in spin valve Josephson structures. Physical Review B. 101 (18), [184522].
DOI: 10.1103/PHYSREVB.101.184522
2019
Jara, A.A., Moen, E., Valls, O.T., Krivorotov, I.N. (2019). Bias current dependence of superconducting transition temperature in superconducting spin-valve nanowires. Physical Review B. 100 (18), [184512].
DOI: 10.1103/PhysRevB.100.184512
2018
Conklin, C., Viñals, J., Valls, O.T. (2018). A connection between living liquid crystals and electrokinetic phenomena in nematic fluids. Soft Matter. 14 (22), [4641-4648].
DOI: 10.1039/c7sm02492d
Moen, E., Valls, O.T. (2018). Spin current and spin transfer torque in ferromagnet/superconductor spin valves. Physical Review B. 97 (17), [174506].
DOI: 10.1103/PhysRevB.97.174506
Moen, E., Valls, O.T. (2018). Spin-split conductance and subgap peak in ferromagnet/superconductor spin valve heterostructures. Physical Review B. 98 (10), [104512].
DOI: 10.1103/PhysRevB.98.104512
2017
Malmi-Kakkada, A.N., Valls, O.T., Dasgupta, C. (2017). Dislocation Mobility and Anomalous Shear Modulus Effect in 4 He Crystals. Journal of Low Temperature Physics. 186 (3-4), [259-274].
DOI: 10.1007/s10909-016-1689-3
Malmi-Kakkada, A.N., Valls, O.T., Dasgupta, C. (2017). Superfluid field response to edge dislocation motion. Physical Review B. 95 (13), [134512].
DOI: 10.1103/PhysRevB.95.134512
Moen, E., Valls, O.T. (2017). Transport in ferromagnet/superconductor spin valves. Physical Review B. 95 (5), [054503].
DOI: 10.1103/PhysRevB.95.054503
2015
Halterman, K., Valls, O.T., Wu, C.T. (2015). Charge and spin currents in ferromagnetic Josephson junctions. Physical Review B - Condensed Matter and Materials Physics. 92 (17), [174516].
DOI: 10.1103/PhysRevB.92.174516
Alidoust, M., Halterman, K., Valls, O.T. (2015). Zero-energy peak and triplet correlations in nanoscale superconductor/ferromagnet/ferromagnet spin valves. Physical Review B - Condensed Matter and Materials Physics. 92 (1), [014508].
DOI: 10.1103/PhysRevB.92.014508
2014
Jara, A.A., Safranski, C., Krivorotov, I.N., Wu, C.T., Malmi-Kakkada, A.N., Valls, O.T., Halterman, K. (2014). Angular dependence of superconductivity in superconductor/spin-valve heterostructures. Physical Review B - Condensed Matter and Materials Physics. 89 (18), [184502].
DOI: 10.1103/PhysRevB.89.184502
Malmi-Kakkada, A.N., Valls, O.T., Dasgupta, C. (2014). Hydrodynamics of compressible superfluids in confined geometries. Journal of Physics B: Atomic, Molecular and Optical Physics. 47 (5), [055301].
DOI: 10.1088/0953-4075/47/5/055301
Malmi-Kakkada, A.N., Valls, O.T., Dasgupta, C. (2014). Ising model on a random network with annealed or quenched disorder. Physical Review B - Condensed Matter and Materials Physics. 90 (2), [024202].
DOI: 10.1103/PhysRevB.90.024202
Wu, C.T., Valls, O.T., Halterman, K. (2014). Tunneling conductance and spin transport in clean ferromagnet/ferromagnet/ superconductor heterostructures. Physical Review B - Condensed Matter and Materials Physics. 90 (5), [054523].
DOI: 10.1103/PhysRevB.90.054523
2013
Eschrig, M., Golubov, A.A., Mazin, I.I., Nadgorny, B., Tanaka, Y., Valls, O.T., Žutić, I. (2013). Comment on "unified formalism of andreev reflection at a ferromagnet/superconductor interface". Physical review letters. 111 (13), [139703].
DOI: 10.1103/PhysRevLett.111.139703
Sinha, D., Sengupta, S., Dasgupta, C., Valls, O.T. (2013). Out of equilibrium plasticity dynamics and the annealing of supersolidity in solid 4He. Journal of Physics Condensed Matter. 25 (29), [295601].
DOI: 10.1088/0953-8984/25/29/295601
Halterman, K., Valls, O.T., Alidoust, M. (2013). Spin-controlled superconductivity and tunable triplet correlations in graphene nanostructures. Physical review letters. 111 (4), [046602].
DOI: 10.1103/PhysRevLett.111.046602
Chiodi, F., Witt, J.D.S., Smits, R.G.J., Qu, L., Halász, G.B., Wu, C.T., Valls, O.T., Halterman, K., Robinson, J.W.A., Blamire, M.G. (2013). Supra-oscillatory critical temperature dependence of Nb-Ho bilayers. EPL. 101 (3), [37002].
DOI: 10.1209/0295-5075/101/37002
2012
Wu, C.T., Valls, O.T., Halterman, K. (2012). Proximity effects and triplet correlations in ferromagnet/ferromagnet/ superconductor nanostructures. Physical Review B - Condensed Matter and Materials Physics. 86 (1), [014523].
DOI: 10.1103/PhysRevB.86.014523
Wu, C.T., Valls, O.T., Halterman, K. (2012). Proximity effects in conical-ferromagnet/superconductor bilayers. Physical Review B - Condensed Matter and Materials Physics. 86 (18), [184517].
DOI: 10.1103/PhysRevB.86.184517
Wu, C.T., Valls, O.T., Halterman, K. (2012). Reentrant superconducting phase in conical-ferromagnet-superconductor nanostructures. Physical review letters. 108 (11), [117005].
DOI: 10.1103/PhysRevLett.108.117005
Wu, C.T., Valls, O.T. (2012). Superconducting proximity effects in ferromagnet/superconductor heterostructures. Journal of Superconductivity and Novel Magnetism. 25 (7), [2173-2175].
DOI: 10.1007/s10948-012-1645-7
2011
Halterman, K., Valls, O.T., Alidoust, M. (2011). Characteristic energies, transition temperatures, and switching effects in clean S|N|S graphene nanostructures. Physical Review B - Condensed Matter and Materials Physics. 84 (6), [064509].
DOI: 10.1103/PhysRevB.84.064509
2010
Zhu, J., Krivorotov, I.N., Halterman, K., Valls, O.T. (2010). Angular dependence of the superconducting transition temperature in ferromagnet-superconductor-ferromagnet trilayers. Physical review letters. 105 (20), [207002].
DOI: 10.1103/PhysRevLett.105.207002
Dasgupta, C., Valls, O.T. (2010). Nonclassical rotational inertia in a two-dimensional bosonic solid containing grain boundaries. Physical Review B - Condensed Matter and Materials Physics. 82 (2), [024523].
DOI: 10.1103/PhysRevB.82.024523
Valls, O.T., Bryan, M., Žutić, I. (2010). Superconducting proximity effects in metals with a repulsive pairing interaction. Physical Review B - Condensed Matter and Materials Physics. 82 (13), [134534].
DOI: 10.1103/PhysRevB.82.134534
2009
Halterman, K., Valls, O.T. (2009). Emergence of triplet correlations in superconductor/half-metallic nanojunctions with spin-active interfaces. Physical Review B - Condensed Matter and Materials Physics. 80 (10), [104502].
DOI: 10.1103/PhysRevB.80.104502
Dasgupta, C., Valls, O.T. (2009). Hydrodynamics of superfluids confined in blocked rings and wedges. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 79 (1), [016303].
DOI: 10.1103/PhysRevE.79.016303
Dasgupta, C., Valls, O.T. (2009). Phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers. Physical Review B - Condensed Matter and Materials Physics. 80 (9), [094517].
DOI: 10.1103/PhysRevB.80.094517
Barsic, P.H., Valls, O.T. (2009). Tunneling conductance in superconductor/ferromagnet junctions: Self-consistent approach. Physical Review B - Condensed Matter and Materials Physics. 79 (1), [014502].
DOI: 10.1103/PhysRevB.79.014502
2008
Halterman, K., Valls, O.T., Barsic, P.H. (2008). Induced triplet pairing in clean s -wave superconductor/ferromagnet layered structures. Physical Review B - Condensed Matter and Materials Physics. 77 (17), [174511].
DOI: 10.1103/PhysRevB.77.174511
2007
Halterman, K., Barsic, P.H., Valls, O.T. (2007). Odd triplet pairing in clean superconductor/ferromagnet heterostructures. Physical review letters. 99 (12), [127002].
DOI: 10.1103/PhysRevLett.99.127002
Dasgupta, C., Valls, O.T. (2007). Phase diagram of randomly pinned vortex matter in layered superconductors: Dependence on the details of the point pinning. Physical Review B - Condensed Matter and Materials Physics. 76 (18), [184509].
DOI: 10.1103/PhysRevB.76.184509
Barsic, P.H., Valls, O.T., Halterman, K. (2007). Thermodynamics and phase diagrams of layered superconductor/ferromagnet nanostructures. Physical Review B - Condensed Matter and Materials Physics. 75 (10), [104502].
DOI: 10.1103/PhysRevB.75.104502
2006
Barsic, P.H., Valls, O.T., Halterman, K. (2006). First-order phase transitions in ferromagnet/superconductor layered structures. Physical Review B - Condensed Matter and Materials Physics. 73 (14), [144514].
DOI: 10.1103/PhysRevB.73.144514
Dasgupta, C., Valls, O.T. (2006). Phase diagram of vortex matter in layered high-temperature superconductors with random point pinning. Physical Review B - Condensed Matter and Materials Physics. 74 (18), [184513].
DOI: 10.1103/PhysRevB.74.184513
2005
Halterman, K., Valls, O.T. (2005). Local density of states and order parameter configurations in layered ferromagnet-superconductor structures. Physica C: Superconductivity and its applications. 420 (3-4), [111-124].
DOI: 10.1016/j.physc.2005.02.004
Halterman, K., Valls, O.T. (2005). Nanoscale ferromagnet-superconductor-ferromagnet switches controlled by magnetization orientation. Physical Review B - Condensed Matter and Materials Physics. 72 (6), [060514].
DOI: 10.1103/PhysRevB.72.060514
Dasgupta, C., Valls, O.T. (2005). Phase diagram of the vortex system in layered superconductors with strong columnar pinning. Physical Review B - Condensed Matter and Materials Physics. 72 (9), [094501].
DOI: 10.1103/PhysRevB.72.094501
2004
Halterman, K., Valls, O.T. (2004). Layered ferromagnet-superconductor structures: The π state and proximity effects. Physical Review B - Condensed Matter and Materials Physics. 69 (1),
DOI: 10.1103/PhysRevB.69.014517
Dasgupta, C., Valls, O.T. (2004). Melting and structure of the vortex solid in strongly anisotropic layered superconductors with random columnar pins. Physical Review B - Condensed Matter and Materials Physics. 69 (21), [214520]. [214520-1-214520-16].
DOI: 10.1103/PhysRevB.69.214520
Halterman, K., Valls, O.T. (2004). Stability of π-junction configurations in ferromagnet-superconductor heterostructures. Physical Review B - Condensed Matter and Materials Physics. 70 (10), [104516]. [104516-1-104516-14].
DOI: 10.1103/PhysRevB.70.104516
Adams, L.L.A., Halterman, K., Valls, O.T., Goldman, A.M. (2004). Two-phase regime in the magnetic field-temperature phase diagram of a type-II superconductor. Physica C: Superconductivity and its applications. 400 (3-4), [171-176].
DOI: 10.1016/j.physc.2003.08.010
2003
Dasgupta, C., Valls, O.T., Valera, M., Pinski, F.J., Johnson, D.D. (2003). Comment on "Classical density functional theory of freezing in simple fluids: Numerically induced false solutions" (multiple letters). Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 67 (6 1), [063501].
Dasgupta, C., Valls, O.T. (2003). Comment on “Classical density functional theory of freezing in simple fluids: Numerically induced false solutions”. Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics. 67 (6),
DOI: 10.1103/PhysRevE.67.063501
Halterman, K., Valls, O.T. (2003). Energy gap of ferromagnet-superconductor bilayers. Physica C: Superconductivity and its applications. 397 (3-4), [151-158].
DOI: 10.1016/S0921-4534(03)01095-5
Dasgupta, C., Valls, O.T. (2003). Two-step melting of the vortex solid in layered superconductors with random columnar pins. Physical review letters. 91 (12),
DOI: 10.1103/PhysRevLett.91.127002
2002
Halterman, K., Valls, O.T. (2002). Proximity effects and characteristic lengths in ferromagnet-superconductor structures. Physical Review B - Condensed Matter and Materials Physics. 66 (22), [224516]. [1-17].
DOI: 10.1103/PhysRevB.66.224516
Halterman, K., Valls, O.T. (2002). Proximity effects at ferromagnet-superconductor interfaces. Physical Review B - Condensed Matter and Materials Physics. 65 (1), [014509]. [145091-1450912].
- Abdul N Malmi-Kakkada (Augusta University, Georgia)
- Evan Moen (Johns Hopkins, APL)
- Klaus Halterman (China Lake Naval Lab)
- Chien-Te Wu (Taiwan National Chao Tung University)