University of Minnesota
School of Physics & Astronomy
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Oriol T. Valls

TATEH 130-25 (office), 624-0516
otvalls @ umn.edu

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Fellow, Minnesota Supercomputer Institute 1989-

Fellow, American Physical Society 1998

APS Outstanding Referee Award, 2009

Summary of Interests
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. [Research Web Page]

About My Work

Ferromagnet-Superconductor
Proximity Effects; Spin Transport; Exotic forms of Superconductivity; Superconducting Vortices; Superfluid Hydrodynamics; High Temperature Superconductors; Nonequilibrium phenomena.

Advisees and Collaborators

Abdul N Malmi-Kakkada (University of Texas)
Evan Moen (TA/RA)
K. Halterman (China Lake Naval Lab)
M. Alidoust (University of Basel)
Chien-Te Wu (Taiwan National Chao Tung University)

Selected Publications

A.N. Malmi-Kakkada, O.T. Valls, and C. Dasgupta, Superfluid Field response to Edge dislocation motion, Phys. Rev B 95, 134512 (2017) [abstract]

Evan Moen and Oriol T. Valls, Transport in ferromagnet/superconductor spin valves, Phys. Rev B 95 054503 (2017) [abstract]

A N Malmi-Kakkada, O T Valls and C Dasgupta, Dislocation mobility and anomalous shear modulus effect in 4He crystals, J. Low Temp Phys 186 259 (2017) [abstract]

K. Halterman, O.T. Valls, C-T Wu, Charge and spin currents in ferromagnetic Josephson junctions, Phys. Rev. B 92 174516 (2015) [abstract]

M. Alidoust, K. Halterman and O.T. Valls, Zero-Energy peak and triplet correlations in nanoscale superconductor/ferromagnet spin valves, Phys. Rev. B 92, 014508 (2015) [abstract]

Chien-Te Wu, O.T. Valls, K. Halterman, Tunneling Conductance and Spin Transport in Clean Ferromagnet-Ferromagnet-Superconductor Heterostructures, Phys. Rev. B 90, 054523 (2014) [abstract]

A. N. Malmi-Kakkada, O.T. Valls and C. Dasgupta, Ising Model on a random network with annealed or quenched disorder, Phys. Rev. B 90, 024202 (2014) [abstract]

A.A. Jara, C. Safranski, I.N. Krivorotov, C.-T. Wu, A.N. Malmi-Kakkadi, O.T. Valls, K. Halterman, Angular dependence of superconductivity in spin-valve/superconductor heterostructures, Phys. Rev. B 89, 184502 (2014) [abstract]

Abdul N Malmi-Kakkada, Oriol T Valls,Chandan Dasgupta, Hydrodynamics of compressible superfluids in confined geometries, J. Phys. B 47, 055301 (2014) [abstract]

K. Halterman, O.T. Valls, and M. Alidoust, Spin-Controlled Superconductivity and Tunable triplet Correlations in Graphene Nanostructures, Phys. Rev. Lett. 111, 046602 (2013) [abstract]

F. Chiodi, J.D.S. Witt, R.G.J. Smits, L. Qu, G.B. Halasz, C-T Wu, O.T. Valls, K. Halterman, J.W.A. Robinson, M.G. Blamire, Supra-oscillatory critical temperature dependence of Nb-Ho bilayers, Europhys. Lett., 101, 37002 (2013) [abstract]

Chien-Te Wu, O.T. Valls, K. Halterman, Proximity Effects in Conical-Ferromagnet/Superconductor bilayers, Phys. Rev. B 86, 184517 (2012) [abstract]

Chien-Te Wu, Oriol T. Valls, Klaus Halterman, Proximity effects and triplet correlations in Ferromagnet/Ferromagnet/Superconductor nanostructures, Phys. Rev. B 86, 014523 (2012) [abstract]

C-T Wu, O.T. Valls, K. Halterman, Reentrant Superconducting Phase in Conical-Ferromagnet-Superconductor Structures, Phys. Rev. Lett. 108, 117005 (2012) [abstract]

K. Halterman, O.T. Valls and M. Alidoust, Characteristic energies, transition temperatures, and switching effects in clean SNS graphene nanostructures, Phys. Rev. B 84, 064509 (2011) [abstract]

J. Zhu, I. Krivorotov, K. Halterman and O.T. Valls, Angular Dependence of the Superconducting Transition Temperature in Ferromagnet-Superconductor-Ferromagnet Trilayers, Phys. Rev. Lett. 105, 207202 (2010) [abstract]

Oriol T. Valls, Matthew Bryan and Igor Zutic, Superconducting proximity effects in metals with a repulsive pairing interaction, Phys. Rev B 82, 134534 (2010) [abstract]

Chandan Dasgupta and Oriol T. Valls, Non-classical Rotational Inertia in a Two-dimensional Bosonic Solid Containing Grain Boundaries, Phys. Rev. B 82, 024523 (2010) [abstract]

K. Halterman and O.T. Valls, Emergence of Triplet Correlations in Superconductor/Half Metallic Nanojunctions with Spin Active Interfaces, Phys. Rev. B 80, 104502 (2009) [abstract]

C. Dasgupta and O.T. Valls, The phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers, Phys. Rev B 80, 094517 (2009) [abstract]

Paul H. Barsic and Oriol T. Valls, Tunneling conductance in Superconductor/Ferromagnet junctions: a self consistent approach, Phys. Rev. B79, 014502 (2009) [abstract]

Chandan Dasgupta and Oriol T. Valls, Hydrodynamics of superfluids confined in blocked rings and wedges, Phys. Rev. E79, 016303 (2009) [abstract]

K. Halterman, O.T. Valls and P.H. Barsic, Induced triplet pairing in s-wave superconductor/ferromagnet layered structures, Phys. Rev. B77, 174511 (2008)

K. Halterman, Paul Barsic and Oriol T. Valls, Odd Triplet Pairing in Clean Superconductor/Ferromagnet Heterostructures, Phys. Rev. Lett. 99 127002 (2007)

Paul H. Barsic, Oriol T. Valls, Klaus Halterman, Thermodynamics and Phase Diagrams of layered superconductor/ferromagnet nanostructures, Phys. Rev. B 75, 104502 (2007)

C. Dasgupta and Oriol T. Valls, Phase diagram of vortex matter in layered superconductors with random point pinning, Phys. Rev. B74 184513 (2006)

Paul H. Barsic, Oriol T. Valls and Klaus Halterman, First order phase transitions in Ferromagnet/Superconductor layered structures, Phys. Rev B73 144514 (2006)

K. Halterman and O.T. Valls, Nanoscale ferromagnet-superconductor-ferromagnet switches controlled by magnetization orientation, Phys. Rev. B72, 060514(R) 2005 [abstract]

C. Dasgupta and O.T. Valls, Phase diagram of the vortex system in layered superconductors with strong columnar pinning, Phys. Rev. B 72, 094501 (2005) [abstract]

K. Halterman and Oriol T. Valls, Local density of states and order parameter configurations in layered superconductor ferromagnet structures, Physica C, 420, 11-124 (2005). [abstract]

K. halterman and O.T. Valls, Stability of the pi junction configuration in ferromagnet-superconductor heterostructures, Phys. Rev B70, 104516 (2004) [abstract]

Klaus Halterman and Oriol T. Valls, Layered ferrromagnet-superconductor structures: the pi state and proximity effects, Phys. Rev B69, 014517 (2004).

Chandan Dasgupta and Oriol T. Valls, Melting and structure of the vortex solid in strongly anisotropic layered superconductors with random columnar pins, Phys. Rev. B69, 214520 (2004).

Chandan Dasgupta and Oriol T. Valls, Two-step melting of the vortex lattice in layered superconductors with random columnar pins, Phys. Rev. Lett. 91 127002(2003)

Klaus Halterman and Oriol T. Valls, Energy gap of ferromagnet-superconductor bilayers, Physica C 397 151 (2003)

Chandan Dasgupta and Oriol T. Valls, Vortices in layered superconductors with columnar pins: a density functional study, Phys. Rev. B66, 064518 (2002).

Chandan Dasgupta and Oriol T. Valls, Vortex lattice melting in layered superconductors with periodic columnar pins, Phys. Rev. Lett. 87, 257002 (2001).

Paul H. Barsic, K. Halterman and Oriol T. Valls, Thermodynamics and Phase diagrams of layered superconductor/ferromagnet nanostructures, Phys. Rev B75, 104502 (2007)

C. Dasgupta and Oriol T. Valls, Phase diagram of vortex matter in layered superconductors with random point pinning, Phys. Rev. B74 184513 (2006)

Klaus Halterman and Oriol T. Valls, Proximity effects at ferromagnet-superconductor interfaces, Phys. Rev. B65, 014509 (2002).

Education

Ph.D., Brown University, 1972-1975.
M.Sc., Brown University, 1970-1972.
B.Sc., University of Barcelona, 1965-1969.