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Parity qubits and poor man's Majorana bound states in double quantum dots
Martin Leijnse, Karsten Flensberg
We study a double quantum dot connected via a common superconducting lead and show that this system can be tuned to host one Majorana bound state (MBS) on each dot. We call them "p…
Finite-bias conductance anomalies at a singlet-triplet crossing
Chiara Stevanato, Martin Leijnse, Karsten Flensberg +1
Quantum dots and single-molecule transistors may exhibit level crossings induced by tuning external parameters such as magnetic field or gate voltage. For Coulomb blockaded devices…
Using hybrid topological-spin qubit systems for two-qubit-spin gates
Martin Leijnse, Karsten Flensberg
We investigate a hybrid quantum system involving spin qubits, based on the spins of electrons confined in quantum dots, and topological qubits, based on Majorana fermions. In such…
Introduction to topological superconductivity and Majorana fermions
Martin Leijnse, Karsten Flensberg
This short review article provides a pedagogical introduction to the rapidly growing research field of Majorana fermions in topological superconductors. We first discuss in some de…
Cotunneling renormalization in carbon nanotube quantum dots
Gediminas Kiršanskas, Jens Paaske, Karsten Flensberg
We determine the level-shifts induced by cotunneling in a Coulomb blockaded carbon nanotube quantum dot using leading order quasi-degenerate perturbation theory within a single nan…
Emerging Dirac and Majorana fermions for carbon nanotubes with proximity-induced pairing and spiral magnetic field
Reinhold Egger, Karsten Flensberg
We study the low-energy bandstructure of armchair and small-bandgap semiconducting carbon nanotubes with proximity-induced superconducting pairing when a spiral magnetic field crea…