Tomas Löfwander

Biträdande professor at Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Tomas Löfwander is an Associated Professor in theoretical physics at the Department of Microtechnology and Nanoscience (MC2) at Chalmers University of Technology in Sweden. He received his master degree in engineering physics in 1996 from Chalmers, and his PhD in theoretical physics in 2001 from Chalmers. He worked as a post-doc at Northwestern University in the USA for three years supported by scholarships from the Swedish Research Council and the Wennergren Foundation, and at Karlsruhe Institute of Technology in Germany for two years supported by a scholarship from the Alexander von Humboldt Foundation. After the post-doctoral work he moved back to Chalmers in 2006. His interests lie in Condensed Matter Physics in general, with emphasis on electronic quantum transport at the nanoscale for future applications in nano-electronics. His publications include studies of Josephson junctions of high-Tc superconductors, heterostructures of superconductors and magnetic materials, and recently graphene nanostructures and single molecule contacts with graphene leads. Löfwander is currently heavily invovled in European projects as Coordinator of the STREP ConceptGraphene and as Vice Director of Graphene Flagship

Source: chalmers.se

Projects

2012–2017

The Swedish Graphene Initiative

Mikael Fogelström Applied Quantum Physics
Floriana Lombardi Quantum Device Physics
Avgust Yurgens Quantum Device Physics
Herbert Zirath Microwave Electronics
Jan Stake Terahertz and Millimetre Wave Laboratory
Elsebeth Schröder Quantum Device Physics
Jari Kinaret Condensed Matter Theory
Sergey Kubatkin Quantum Device Physics
Tomas Löfwander Applied Quantum Physics
Eva Olsson Eva Olsson Group
Andreas Isacsson Condensed Matter Theory
Niklas Rorsman Microwave Electronics
Knut and Alice Wallenberg Foundation

2016–2020

Epitaxiell grafen för metrologi, sensorer och elektronik

Tomas Löfwander Applied Quantum Physics
Sergey Kubatkin Quantum Device Physics
Mikael Fogelström Microtechnology and Nanoscience (MC2)
Samuel Lara Avila Quantum Device Physics
Swedish Foundation for Strategic Research (SSF)

2011–2013

Superconducting spintronics with half-metallic ferromagnets

Tomas Löfwander Applied Quantum Physics
Swedish Research Council (VR)

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Publications

2017

Impurity scattering and size quantization effects in a single graphene nanoflake

J. Tesch, P. Leicht, F. Blumenschein et al
Physical Review B: covering condensed matter and materials physics. Vol. 95 (7)
Journal article
2017

Shot noise in a harmonically driven ballistic graphene transistor

Yevgeniy Korniyenko, O. Shevtsov, Tomas Löfwander
Physical Review B: covering condensed matter and materials physics. Vol. 95 (16)
Journal article
2017

Shot noise in a harmonically driven ballistic graphene transistor

Yevgeniy Korniyenko, O. Shevtsov, Tomas Löfwander
Physical Review B: covering condensed matter and materials physics. Vol. 95 (16)
Journal article
2016

Nonlinear response of a ballistic graphene transistor with an ac-driven gate: High harmonic generation and terahertz detection

Yevgeniy Korniyenko, O. Shevtsov, Tomas Löfwander
Physical Review B: covering condensed matter and materials physics. Vol. 94 (12), p. Art no 125445-
Journal article
2016

Spin-polarized currents and noise in normal-metal/superconductor junctions with Yu-Shiba-Rusinov impurities

Daniel Persson, Oleksii Shevtsov, Tomas Löfwander et al
Physical Review B: covering condensed matter and materials physics. Vol. 94, p. 155424-
Journal article
2016

Resonant second-harmonic generation in a ballistic graphene transistor with an ac-driven gate

Yevgeniy Korniyenko, Oleksii Shevtsov, Tomas Löfwander
Physical Review B: covering condensed matter and materials physics. Vol. 93 (3)
Journal article
2016

Hot spot formation in electron-doped PCCO nanobridges

Sophie Charpentier, Riccardo Arpaia, J. Gaudet et al
Physical Review B: covering condensed matter and materials physics. Vol. 94 (6)
Journal article
2015

Spontaneously broken time-reversal symmetry in high-temperature superconductors

Mikael Håkansson, Tomas Löfwander, Mikael Fogelström
Nature Physics. Vol. 11 (9), p. 755-760
Journal article
2015

Influence of 0001 tilt grain boundaries on the destruction of the quantum Hall effect in graphene

Anders Bergvall, J. M. Carlsson, Tomas Löfwander
Physical Review B - Condensed Matter and Materials Physics. Vol. 91 (24)
Journal article
2015

Science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems

A. C. Ferrari, F. Bonaccorso, V. Fal'ko et al
Nanoscale. Vol. 7 (11), p. 4598-4810
Journal article
2015

Spectral properties of superconductors with ferromagnetically ordered magnetic impurities

Daniel Persson, Oleksii Shevtsov, Tomas Löfwander et al
Physical Review B - Condensed Matter and Materials Physics. Vol. 92 (24), p. 245430-
Journal article
2014

Spin imbalance in hybrid superconducting structures with spin-active interfaces

Oleksii Shevtsov, Tomas Löfwander
Physical Review B - Condensed Matter and Materials Physics. Vol. 90 (8), p. 085432-
Journal article
2014

Quasiclassical Theory of Spin Imbalance in a Normal Metal-Superconductor Heterostructure with a Spin-Active Interface

Oleksii Shevtsov, Tomas Löfwander
Journal of Physics: Conference Series. Vol. 568 (2), p. 022044-
Paper in proceedings
2013

Andreev spectroscopy of CrO2 thin films on TiO2 and Al2O3

K.A. Yates, M.S. Anwar, J.F.M. Aarts et al
Europhysics Letters. Vol. 103 (6)
Journal article
2013

Quantum Hall effect in graphene with twisted bilayer stripe defects

Tomas Löfwander, P. San-Jose, E. Prada
Physical Review B - Condensed Matter and Materials Physics. Vol. 87 (20)
Journal article
2013

Spectral footprints of impurity scattering in graphene nanoribbons

Anders Bergvall, Tomas Löfwander
Physical Review B - Condensed Matter and Materials Physics. Vol. 87 (20)
Journal article
2013

Inverse proximity effect and influence of disorder on triplet supercurrents in strongly spin-polarized ferromagnets

R. Grein, Tomas Löfwander, M. Eschrig
Physical Review B - Condensed Matter and Materials Physics. Vol. 88 (5)
Journal article
2011

Graphene nanogap for gate-tunable quantum-coherent single-molecule electronics

Anders Bergvall, Kristian Berland, Per Hyldgaard et al
Physical Review B - Condensed Matter and Materials Physics. Vol. 84 (15)
Journal article
2010

Is CrO2 Fully Spin Polarized? Analysis of Andreev Spectra and Excess Current

Tomas Löfwander, R. Grein, M. Eschrig
Physical Review Letters. Vol. 105 (20)
Journal article
2010

Theory of superconductor-ferromagnet point-contact spectra: The case of strong spin polarization

R. Grein, Tomas Löfwander, G. Metalidis et al
Journal of Logic and Computation. Vol. 81 (9), p. Art. no. 094508-
Journal article
2008

0-pi Transitions in a Superconductor/Chiral Ferromagnet/Superconductor Junction Induced by a Homogeneous Cycloidal Spiral

Thierry Champel, Tomas Löfwander, Matthias Eschrig
Physical Review Letters. Vol. 100, p. 077003-
Journal article
2008

Triplet supercurrents in clean and disordered half-metallic ferromagnets

Matthias Eschrig, Tomas Löfwander
Nature Physics. Vol. 4, p. 138-
Journal article
2008

Spectrum of Andreev Bound States in a Molecule Embedded Inside a Microwave-Excited Superconducting Junction

Jonas Sköldberg, Tomas Löfwander, Vitaly Shumeiko et al
Physical Review Letters. Vol. 101 (8), p. 087002-
Journal article
2007

Impurity scattering and Mott's formula in graphene

Tomas Löfwander, Mikael Fogelström
Physical Review B - Condensed Matter and Materials Physics. Vol. 76, p. 193401-
Journal article
2007

Phase diagrams of ferromagnet-superconductor multilayers with misaligned exchange fields

Tomas Löfwander, Thierry Champel, Matthias Eschrig
Physical Review B. Vol. 75, p. 014512-
Journal article
2006

Low­Temperature Thermal Conductivity of Superconductors With Gap Nodes

Tomas Löfwander, Mikael Fogelström
AIP Conference Proceedings. Vol. 850, p. 569-
Journal article
2006

Observation of periodic pi-phase shifts in ferromagnet-superconductor multilayers

V Shelukhin, A Tsukernik, M Karpovski et al
Physical Review B. Vol. 73, p. 174506-
Journal article
2006

Large Thermoelectric Effects and Inelastic Scattering in Unconventional Superconductors

Mikael Fogelström, Tomas Löfwander
AIP Conference Proceedings. Vol. 850, p. 567-
Journal article
2005

Low-temperature thermal conductivity of superconductors with gap nodes

Tomas Löfwander, Mikael Fogelström
Physical Review Letters. Vol. 95, p. 107006-
Journal article
2004

Large Thermoelectric Effects in Unconventional Superconductors.

Tomas Löfwander, Mikael Fogelström
Physical Review B. Vol. 70 (2), p. 024515-
Journal article
2001

Transport Properties of Superconducting d-wave junctions

Tomas Löfwander
Doctoral thesis
1998

AC Josephson effect in superconducting d-wave junctions

Tomas Löfwander
Licentiate thesis