196 citations · 1.1k across the 32 of their papers we have counts for
32 papers
Altermagnetic spin textures coupled to superconductors: Domain wall spin-triplet superconductivity and supercurrent-induced torques
Yasir Dar, Mathias S. Scheurer, Constantin Schrade
Motivated by the absence of sizable stray fields and the recently discovered highly non-trivial impact of altermagnetic textures on itinerant electrons, we here study the form of C…
Revisiting the multi-mode rhombus circuit as a biased-noise qubit
Pablo Aramburu Sanchez, Trevyn F. Q. Larson, Anthony P. McFadden +3
In this work, we revisit the idea of using an interferometer of pairs of Josephson junctions as a protected rhombus qubit. Unlike in the original proposal, where the qubit states a…
Altermagnetic spin textures: Emergent electrodynamics, quantum geometry, and probes
Constantin Schrade, Mathias S. Scheurer
Emergent electrodynamics arising from spatially and temporally varying magnetic textures provides a framework for spin control in quantum materials. While this principle is establi…
Altermagnetic Superconducting Diode Effect in MnPt/Nb Heterostructures
Saurav Sachin, Mathias S. Scheurer, Constantin Schrade +1
Compensated magnetic orders that can split the spin-degeneracy of electronic bands have become a very active field of research. As opposed to spin-orbit coupling, the splitting res…
Altermagnetic superconducting diode effect from non-collinear compensated magnetism in MnPt
Constantin Schrade, Sujit Manna, Mathias S. Scheurer
Altermagnets have recently emerged as a distinct class of magnetic systems that exhibit spin splitting of electronic bands while retaining zero net magnetization. This unique combi…
Finite-momentum superconductivity from chiral bands in twisted MoTe
Yinqi Chen, Cheng Xu, Yang Zhang +1
A recent experiment has reported unconventional superconductivity in twisted bilayer MoTe, emerging from a normal state that exhibits a finite anomalous Hall effect -- a signat…
Intrinsic superconducting diode effect and nonreciprocal superconductivity in rhombohedral graphene multilayers
Yinqi Chen, Mathias S. Scheurer, Constantin Schrade
Recent experiments have revealed that superconductivity in rhombohedral tetralayer graphene can emerge from a valley-polarized and, hence, chiral normal state. The interplay of pai…
Fermionic Quantum Simulation on Andreev Bound State Superlattices
Peter D. Johannsen, Constantin Schrade
Arrays of superconducting qubits and cavities offer a promising route for realizing highly controllable artificial materials. However, many analog simulations of superconducting ci…
Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
A. Maiani, A. C. C. Drachmann, L. Galletti +4
We report tunneling spectroscopy and transport measurements in superconducting Al and ferromagnetic-insulator EuS bilayers. The samples display remanent spin-splitting, roughly hal…
Tuning the Josephson diode response with an ac current
Rubén Seoane Souto, Martin Leijnse, Constantin Schrade +3
Josephson diodes are superconducting elements that show an asymmetry in the critical current depending on the direction of the current. Here, we theoretically explore how an altern…
Dissipationless Nonlinearity in Quantum Material Josephson Diodes
Constantin Schrade, Valla Fatemi
Dissipationless nonlinearities for three-wave mixing are a key component of many superconducting quantum devices, such as amplifiers and bosonic qubits. So far, such third-order no…
Parity-conserving Cooper-pair transport and ideal superconducting diode in planar Germanium
Marco Valentini, Oliver Sagi, Levon Baghumyan +16
Superconductor/semiconductor hybrid devices have attracted increasing interest in the past years. Superconducting electronics aims to complement semiconductor technology, while hyb…
Charge-4e supercurrent in a two-dimensional InAs-Al superconductor-semiconductor heterostructure
Carlo Ciaccia, Roy Haller, Asbjørn C. C. Drachmann +4
Superconducting qubits with intrinsic noise protection offer a promising approach to improve the coherence of quantum information. Crucial to such protected qubits is the encoding…
Gate Tunable Josephson Diode in Proximitized InAs Supercurrent Interferometers
Carlo Ciaccia, Roy Haller, Asbjørn C. C. Drachmann +4
The Josephson diode (JD) is a non-reciprocal circuit element that supports a larger critical current in one direction compared to the other. This effect has gained a growing intere…
Nonsinusoidal current-phase relations in semiconductor-superconductor-ferromagnetic insulator devices
Andrea Maiani, Karsten Flensberg, Martin Leijnse +3
Coherent tunneling processes of multiple Cooper pairs across a Josephson junction give rise to higher harmonics in the current phase relation. In this work, we propose and study Jo…
The Josephson diode effect in supercurrent interferometers
Rubén Seoane Souto, Martin Leijnse, Constantin Schrade
A Josephson diode is a non-reciprocal circuit element that supports a larger dissipationless supercurrent in one direction than in the other. In this work, we propose and theoretic…
Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
D. Razmadze, R. Seoane Souto, L. Galletti +7
We report supercurrent transport measurements in hybrid Josephson junctions comprised of semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconductin…
Entangling transmons with low-frequency protected superconducting qubits
Andrea Maiani, Morten Kjaergaard, Constantin Schrade
Novel qubits with intrinsic noise protection constitute a promising route for improving the coherence of quantum information in superconducting circuits. However, many protected su…
Protected hybrid superconducting qubit in an array of gate-tunable Josephson interferometers
Constantin Schrade, Charles M. Marcus, András Gyenis
We propose a protected qubit based on a modular array of superconducting islands connected by semiconductor Josephson interferometers. The individual interferometers realize effect…
Nematic, chiral and topological superconductivity in transition metal dichalcogenides
Constantin Schrade, Liang Fu
We introduce and study a realistic model for superconductivity in twisted bilayer WSe, where electron pairing arises from spin-valley fluctuations in the weak-coupling regime…
Supercurrent parity-meter in a nanowire Cooper-pair transistor
Ji-Yin Wang, Constantin Schrade, Vukan Levajac +13
We study a Cooper-pair transistor realized by two Josephson weak links that enclose a superconducting island in an InSb-Al hybrid nanowire. When the nanowire is subject to a magnet…
Spin-valley density wave in moiré materials
Constantin Schrade, Liang Fu
We introduce and study a minimum two-orbital Hubbard model on a triangular lattice, which captures the key features of both the trilayer ABC-stacked graphene-boron nitride heterost…
Entangling Spins in Double Quantum Dots and Majorana Bound States
Marko J. Rančić, Silas Hoffman, Constantin Schrade +2
We study the coupling between a singlet-triplet qubit realized in a double quantum dot to a topological qubit realized by spatially well-separated Majorana bound states. We demonst…
Andreev or Majorana, Cooper finds out
Constantin Schrade, Liang Fu
We study a Cooper pair transistor realized by a mesoscopic superconductor island that couples to a pair of -wave superconducting leads. For a trivial island, the critical superc…