Jens Paaske
YOU?
Author Swipe
View article: Yu-Shiba-Rusinov states in color-superconducting quark matter
Yu-Shiba-Rusinov states in color-superconducting quark matter Open
The high-density region of the QCD phase diagram displays an intricate competition between color superconductivity and the QCD Kondo effect due to color exchange in quark matter containing a single heavy quark impurity. We explore the char…
View article: Poor Man’s Majorana Tetron
Poor Man’s Majorana Tetron Open
The Majorana tetron is a prototypical topological qubit stemming from the ground-state degeneracy of a superconducting island hosting four Majorana modes. This degeneracy manifests as an effective nonlocal spin degree of freedom, the most …
View article: Reduced Basis Method for Driven-Dissipative Quantum Systems
Reduced Basis Method for Driven-Dissipative Quantum Systems Open
Reduced basis methods provide an efficient way of mapping out phase diagrams of strongly correlated many-body quantum systems. The method relies on using the exact solutions at select parameter values to construct a low-dimensional basis, …
View article: Signatures of Amorphous Shiba State in FeTe<sub>0.55</sub>Se<sub>0.45</sub>
Signatures of Amorphous Shiba State in FeTe<sub>0.55</sub>Se<sub>0.45</sub> Open
The iron-based superconductor FeTe0.55Se0.45 is a peculiar material: it hosts surface states with a Dirac dispersion, is a putative topological superconductor hosting Majorana modes in vortices, and has an unusually low Fermi energy. The s…
View article: The poor man's Majorana tetron
The poor man's Majorana tetron Open
The Majorana tetron is a prototypical topological qubit stemming from the ground state degeneracy of a superconducting island hosting four Majorana modes. This degeneracy manifests as an effective non-local spin degree of freedom, whose mo…
View article: Majorana modes in quantum dots coupled via a floating superconducting island
Majorana modes in quantum dots coupled via a floating superconducting island Open
Majorana modes can be engineered in arrays where quantum dots (QDs) are coupled via grounded superconductors, effectively realizing an artificial Kitaev chain. Minimal Kitaev chains, composed by two QDs, can host fully-localized Majorana m…
View article: Simulating electron-vibron energy transfer with quantum dots and resonators
Simulating electron-vibron energy transfer with quantum dots and resonators Open
Gateable semiconductor quantum dots (QDs) provide a versatile platform for analog quantum simulations of electronic many-body systems. In particular, QD arrays offer a natural representation of the interacting $π$-electron system of small …
View article: BCS surrogate models for floating superconductor-semiconductor hybrids
BCS surrogate models for floating superconductor-semiconductor hybrids Open
Superconductor-semiconductor hybrid devices, involving quantum dots interfaced with floating and/or grounded superconductors, have reached a level of complexity which calls for the development of versatile and numerically efficient modelli…
View article: Spin-1 Haldane chains of superconductor-semiconductor hybrids
Spin-1 Haldane chains of superconductor-semiconductor hybrids Open
We theoretically explore the possibility of realizing the symmetry-protected topological Haldane phase of spin-1 chains in a tunable hybrid platform of superconducting islands (SIs) and quantum dots (QDs). Inspired by recent findings sugge…
View article: Surrogate model solver for impurity-induced superconducting subgap states
Surrogate model solver for impurity-induced superconducting subgap states Open
A simple impurity solver is shown to capture the impurity-induced superconducting subgap states in quantitative agreement with the numerical renormalization group and quantum Monte-Carlo simulations. The solver is based on the exact diagon…
View article: Anomalous Josephson current through a driven double quantum dot
Anomalous Josephson current through a driven double quantum dot Open
Josephson junctions based on quantum dots offer a convenient tunability by means of local gates. Here we analyze a Josephson junction based on a serial double quantum dot in which the two dots are individually gated by phase-shifted microw…
View article: Anomalous Josephson current through a driven double quantum dot
Anomalous Josephson current through a driven double quantum dot Open
Josephson junctions based on quantum dots offer a convenient tunability by means of local gates. Here we analyze a Josephson junction based on a serial double quantum dot in which the two dots are individually gated by phase-shifted microw…
View article: Direct transport between superconducting subgap states in a double quantum dot
Direct transport between superconducting subgap states in a double quantum dot Open
We demonstrate direct transport between two opposing sets of Yu-Shiba-Rusinov (YSR) subgap states realized in a double quantum dot. This bound-state-to-bound-state transport relies on intrinsic quasiparticle relaxation, and the tunable gat…
View article: Inductive microwave response of Yu-Shiba-Rusinov states
Inductive microwave response of Yu-Shiba-Rusinov states Open
We calculate the frequency-dependent admittance of a phase-biased Josephson junction spanning a magnetic impurity or a spinful Coulomb-blockaded quantum dot. The local magnetic moment gives rise to Yu-Shiba-Rusinov bound states, which gove…
View article: Inelastic scattering rates in d-wave superconductors
Inelastic scattering rates in d-wave superconductors Open
The inelastic scattering rates of quasiparticles in a two-dimensional d-wave superconductor, which arise from interactions with either acoustic phonons or other quasiparticles, are calculated within second order perturbation theory. We dis…
View article: Triplet-blockaded Josephson supercurrent in double quantum dots
Triplet-blockaded Josephson supercurrent in double quantum dots Open
Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrostatic gating and an external magnetic field. In this Rapid Co…
View article: Two-impurity Yu-Shiba-Rusinov states in coupled quantum dots
Two-impurity Yu-Shiba-Rusinov states in coupled quantum dots Open
Using double quantum dots as the weak link of a Josephson junction, we\nrealize the superconducting analog of the celebrated two-impurity Kondo model.\nThe device shows a cusped current-voltage characteristic, which can be modelled\nby an …
View article: Triplet-blockaded Josephson supercurrent in double quantum dots
Triplet-blockaded Josephson supercurrent in double quantum dots Open
Raw datasets, figure data and source code for the paper "Triplet-blockaded Josephson supercurrent in double quantum dots". See readme.md for usage instructions.
View article: Triplet-blockaded Josephson supercurrent in double quantum dots
Triplet-blockaded Josephson supercurrent in double quantum dots Open
Raw datasets, figure data and source code for the paper "Triplet-blockaded Josephson supercurrent in double quantum dots". See readme.md for usage instructions.
View article: Current-Induced Gap Opening in Interacting Topological Insulator Surfaces
Current-Induced Gap Opening in Interacting Topological Insulator Surfaces Open
Two-dimensional topological insulators (TIs) host gapless helical edge states that are predicted to support a quantized two-terminal conductance. Quantization is protected by time-reversal symmetry, which forbids elastic backscattering. Pa…
View article: The antiferromagnetic phase of the Floquet-driven Hubbard model
The antiferromagnetic phase of the Floquet-driven Hubbard model Open
A saddle point plus fluctuations analysis of the periodically driven\nhalf-filled two-dimensional Hubbard model is performed. For drive frequencies\nbelow the equilibrium gap, we find discontinuous transitions to time-dependent\nsolutions.…
View article: Ground-State Spin Blockade in a Single-Molecule Junction
Ground-State Spin Blockade in a Single-Molecule Junction Open
It is known that the quantum mechanical ground state of a nanoscale junction has a significant impact on its electrical transport properties. This becomes particularly important in transistors consisting of a single molecule. Because of st…
View article: Supercurrent in a Double Quantum Dot
Supercurrent in a Double Quantum Dot Open
We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The supercurrent stability diagram adopts a honeycomb pattern. We observe sharp discontinuities in the magnitude…
View article: KVARKER, LEPTONER OG DEN OVERFLØDIGE SAMLING: Jagten på en teori for alting – og ingenting
KVARKER, LEPTONER OG DEN OVERFLØDIGE SAMLING: Jagten på en teori for alting – og ingenting Open
The article views collections as non-random
accumulations, i.e. objects with interrelations
and a well hidden, unifying theme.
In the greatest of all collections, referred to
loosely as the universe, such interrelations
make up the “l…
View article: Cooper pair induced frustration and nematicity of two-dimensional magnetic adatom lattices
Cooper pair induced frustration and nematicity of two-dimensional magnetic adatom lattices Open
We propose utilizing the Cooper pair to induce magnetic frustration in systems of two-dimensional (2D) magnetic adatom lattices on s-wave superconducting surfaces. The competition between singlet electron correlations and the RKKY coupling…
View article: Symmetry analysis of strain, electric and magnetic fields in the Bi<sub>2</sub>Se<sub>3</sub>-class of topological insulators
Symmetry analysis of strain, electric and magnetic fields in the Bi<sub>2</sub>Se<sub>3</sub>-class of topological insulators Open
Based on group theoretical arguments we derive the most general Hamiltonian\nfor the $\\text{Bi}_2\\text{Se}_3$-class of materials including terms to third\norder in the wave vector, first order in electric and magnetic fields, first\norde…
View article: Strain-enhanced optical absorbance of topological insulator films
Strain-enhanced optical absorbance of topological insulator films Open
Topological insulator films are promising materials for optoelectronics due to a strong optical absorption and a thickness dependent band gap of the topological surface states. They are superior candidates for photodetector applications in…