523 citations · 1.5k across the 33 of their papers we have counts for
33 papers
SuperConga: an open-source framework for mesoscopic superconductivity
P. Holmvall, N. Wall Wennerdal, M. Håkansson +4
We present SuperConga, an open-source framework for simulating equilibrium properties of unconventional and ballistic singlet superconductors, confined to two-dimensional (2D) meso…
Disorder-robust phase crystal in high-temperature superconductors stabilized by strong correlations
Debmalya Chakraborty, Tomas Löfwander, Mikael Fogelström +1
The simultaneous interplay of strong electron-electron correlations, topological zero-energy states, and disorder is yet an unexplored territory but of immense interest due to thei…
Spontaneously broken translational symmetry at edges of high-temperature superconductors: thermodynamics in magnetic field
P. Holmvall, A. B. Vorontsov, M. Fogelstrom +1
We investigate equilibrium properties, including structure of the order parameter, superflow patterns, and thermodynamics of low-temperature surface phases of layered d_{x^2-y^2}-w…
Graphene plasmons: impurities and nonlocal effects
Giovanni Viola, Tobias Wenger, Jari Kinaret +1
This work analyses how impurities and vacancies on the surface of a graphene sample affect its optical conductivity and plasmon excitations. The disorder is analysed in the self-co…
Current-controlled light scattering and asymmetric plasmon propagation in graphene
Tobias Wenger, Giovanni Viola, Jari Kinaret +2
We demonstrate that plasmons in graphene can be manipulated using a DC current. A source-drain current lifts the forward/backward degeneracy of the plasmons, creating two modes wit…
Spontaneous generation of fractional vortex-antivortex pairs at single edges of high-Tc superconductors
Patric Holmvall, Tomas Löfwander, Mikael Fogelström
Unconventional d-wave superconductors with pair-breaking edges are predicted to have ground states with spontaneously broken time-reversal and translational symmetries. We use the…
Optical signatures of nonlocal plasmons in graphene
Tobias Wenger, Giovanni Viola, Philippe Tassin +2
We theoretically investigate under which conditions nonlocal plasmon response in monolayer graphene can be detected. To this purpose, we study optical scattering off graphene plasm…
Correlated Cooper pair transport and microwave photon emission in the dynamical Coulomb blockade
Juha Leppäkangas, Mikael Fogelström, Michael Marthaler +1
We study theoretically electromagnetic radiation emitted by inelastic Cooper-pair tunneling. We consider a dc-voltage-biased superconducting transmission line terminated by a Josep…
Spectral properties of superconductors with ferromagnetically ordered magnetic impurities
Daniel Persson, Oleksii Shevtsov, Tomas Löfwander +1
We present a comprehensive theoretical study of thermodynamic properties of superconductors with a dilute concentration of magnetic impurities, with focus on how the properties of…
Lifshitz transition in the double-core vortex in 3He-B
M. A. Silaev, E. V. Thuneberg, M. Fogelström
We study the spectrum of fermion states localized within the vortex core of a weak-coupling p-wave superfluid. The low energy spectrum consists of two anomalous branches that cross…
Spontaneously broken time-reversal symmetry in high-temperature superconductors
Mikael Håkansson, Tomas Löfwander, Mikael Fogelström
Conventional superconductors are strong diamagnets that through the Meissner effect expel magnetic fields. It would therefore be surprising if a superconducting ground state would…
Two-channel point-contact tunneling theory of superconductors
Mikael Fogelstrom, Matthias J. Graf, V. A. Sidorov +3
We introduce a two-channel tunneling model to generalize the widely used BTK theory of point-contact conductance between a normal metal contact and superconductor. Tunneling of ele…
Input-output description of microwave radiation in the dynamical Coulomb blockade
Juha Leppäkangas, Göran Johansson, Michael Marthaler +1
We study microwave radiation emitted by a small voltage-biased Josephson junction connected to a superconducting transmission line. An input-output formalism for the radiation fiel…
Quantized conductance and its correlation to the supercurrent in a nanowire connected to superconductors
Simon Abay, Daniel Persson, Henrik Nilsson +4
We report conductance and supercurrent of InAs nanowires coupled to Al-superconducting electrodes with short channel lengths and good Ohmic contacts. The nanowires are suspended 15…
Effects of quasiparticle tunneling in a circuit-QED realization of a strongly driven two-level system
J. Leppäkangas, S. E. de Graaf, A. Adamyan +5
We experimentally and theoretically study the frequency shift of a driven cavity coupled to a superconducting charge qubit. In addition to previous studies, we here also consider d…
Model evidence of a superconducting state with a full energy gap in small cuprate islands
Annica M. Black-Schaffer, Dmitri S. Golubev, Thilo Bauch +2
We investigate subdominant order parameters stabilizing at low temperatures in nano-scale high-T cuprate islands, motivated by the recent observation of a fully gapped state in…
Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection
Cecilia Holmqvist, Mikael Fogelström, Wolfgang Belzig
We investigate the charge and spin transport of a voltage-biased superconducting point contact coupled to a nanomagnet. The magnetization of the nanomagnet is assumed to precess wi…
Nonclassical photon pair production in a voltage-biased Josephson junction
Juha Leppäkangas, Göran Johansson, Michael Marthaler +1
We investigate electromagnetic radiation emitted by a small voltage-biased Josephson junction connected to a superconducting transmission line. At frequencies below the well known…
Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet
C. Holmqvist, W. Belzig, M. Fogelström
The supercurrent of a quantum point contact coupled to a nanomagnet strongly depends on the dynamics of the nanomagnet's spin. We employ a fully microscopic model to calculate the…
Tunneling limit of heavy-fermion point contacts
Mikael Fogelstrom, Matthias J. Graf
We present results for a multichannel tunneling model that describes point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We calculate tunneling…
Non-equilibrium effects in a Josephson junction coupled to a precessing spin
C. Holmqvist, S. Teber, M. Fogelström
We present a theoretical study of a Josephson junction consisting of two s-wave superconducting leads coupled over a classical spin. When an external magnetic field is applied, the…
Point-contact spectroscopy in heavy-fermion superconductors
Mikael Fogelström, W. K. Park, L. H. Greene +2
We develop a minimal model to calculate point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We apply our tunneling model to the heavy fermion C…
Transport and magnetization dynamics in a superconductor/single-molecule magnet/superconductor junction
S. Teber, C. Holmqvist, M. Fogelstrom
We study dc-transport and magnetization dynamics in a junction of arbitrary transparency consisting of two spin-singlet superconducting leads connected via a single classical spin…
Shot noise and multiple Andreev reflections in d-wave superconductors
J. C. Cuevas, M. Fogelstrom
We present a theoretical analysis of the shot noise in d-wave/d-wave contacts with arbitrary transparency, including the contribution of multiple Andreev reflections. The multiple…