1.7k citations · 6.2k across the 64 of their papers we have counts for
65 papers
Understanding Symmetry Breaking in Twisted Bilayer Graphene from Cluster Constraints
Nikita Astrakhantsev, Glenn Wagner, Tom Westerhout +2
Twisted bilayer graphene is an exciting platform for exploring correlated quantum phases, extremely tunable with respect to both the single-particle bands and the interaction profi…
Effects of nucleation at a first-order transition between two superconducting phases: Application to CeRhAs
András L. Szabó, Mark H. Fischer, Manfred Sigrist
Recent experiments observed a phase transition within the superconducting regime of the heavy-fermion system CeRhAs when subjected to a -axis magnetic field. This phase…
Phenomenology of bond and flux orders in kagome metals
Glenn Wagner, Chunyu Guo, Philip J. W. Moll +2
Despite much experimental and theoretical work, the nature of the charge order in the kagome metals belonging to the family of materials AVSb (A=Cs,Rb,K) remains controvers…
Distinct switching of chiral transport in the kagome metals KVSb and CsVSb
Chunyu Guo, Maarten R. van Delft, Martin Gutierrez-Amigo +10
The kagome metals AVSb (A=K,Rb,Cs) present an ideal sandbox to study the interrelation between multiple coexisting correlated phases such as charge order and superconductiv…
Correlated order at the tipping point in the kagome metal CsVSb
Chunyu Guo, Glenn Wagner, Carsten Putzke +10
Spontaneously broken symmetries are at the heart of many phenomena of quantum matter and physics more generally. However, determining the exact symmetries broken can be challenging…
A mechanism for phase shifts in Little-Parks experiments: application to 4Hb-TaS and to 2H-TaS intercalated with chiral molecules
Mark H. Fischer, Patrick A. Lee, Jonathan Ruhman
Recently, unusual phase shifts in Little-Parks experiments performed on two systems derived from the layered superconductor 2H-TaS were reported. These systems share the co…
Interacting topological quantum chemistry of Mott atomic limits
Martina O. Soldini, Nikita Astrakhantsev, Mikel Iraola +6
Topological quantum chemistry (TQC) is a successful framework for identifying (noninteracting) topological materials. Based on the symmetry eigenvalues of Bloch eigenstates at maxi…
Weak-signal extraction enabled by deep-neural-network denoising of diffraction data
Jens Oppliger, M. Michael Denner, Julia Küspert +20
Removal or cancellation of noise has wide-spread applications for imaging and acoustics. In every-day-life applications, denoising may even include generative aspects, which are un…
Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect
Avior Almoalem, Irena Feldman, Michael Shlafman +5
Finding unambiguous evidence of non-trivial pairing states is one of the greatest experimental challenges in the field of unconventional superconductivity. Such evidence requires p…
Superconductivity and Local Inversion-Symmetry Breaking
Mark H Fischer, Manfred Sigrist, Daniel F Agterberg +1
Inversion and time reversal are essential symmetries for the structure of Cooper pairs in superconductors. The loss of one or both leads to modifications to this structure and can…
Uniaxial Pressure Induced Stripe Order Rotation in LaSrCuO
Qisi Wang, K. von Arx, D. G. Mazzone +19
Static stripe order is detrimental to superconductivity. Yet, it has been proposed that transverse stripe fluctuations may enhance the inter-stripe Josephson coupling and thus prom…
Switchable chiral transport in charge-ordered Kagome metal CsVSb
Chunyu Guo, Carsten Putzke, Sofia Konyzheva +9
When electric conductors differ from their mirror image, unusual chiral transport coefficients appear that are forbidden in achiral metals, such as a non-linear electric response k…
Role of Topology and Symmetry for the Edge Currents of a 2D Superconductor
Maximilian F. Holst, Manfred Sigrist, Mark H. Fischer
The bulk-boundary correspondence guarantees topologically protected edge states in a two-dimensional topological superconductor. Unlike in topological insulators, these edge states…
Simulating a ring-like Hubbard system with a quantum computer
Philippe Suchsland, Panagiotis Kl. Barkoutsos, Ivano Tavernelli +2
We develop a workflow to use current quantum computing hardware for solving quantum many-body problems, using the example of the fermionic Hubbard model. Concretely, we study a fou…
Nature of unconventional pairing in the kagome superconductors AVSb
Xianxin Wu, Tilman Schwemmer, Tobias Müller +10
The recent discovery of AVSb (A=K,Rb,Cs) has uncovered an intriguing arena for exotic Fermi surface instabilities in a kagome metal. Among them, superconductivity is found…
Spin response and topology of a staggered Rashba superconductor
Anastasiia Skurativska, Manfred Sigrist, Mark H. Fischer
Inversion symmetry is a key symmetry in unconventional superconductors and even its local breaking can have profound implications. For inversion-symmetric systems, there is a compe…
Introduction to Machine Learning for the Sciences
Titus Neupert, Mark H Fischer, Eliska Greplova +2
This is an introductory machine-learning course specifically developed with STEM students in mind. Our goal is to provide the interested reader with the basics to employ machine le…
Unusual - phase diagram of CeRhAs -- the role of staggered non-centrosymmetricity
Eric G. Schertenleib, Mark H. Fischer, Manfred Sigrist
Superconductivity in a crystalline lattice without inversion is subject to complex spin-orbit-coupling effects, which can lead to mixed-parity pairing and an unusual magnetic respo…
Direct evidence for Cooper pairing without a spectral gap in a disordered superconductor above
Koen M. Bastiaans, Damianos Chatzopoulos, Jian-Feng Ge +9
The idea that preformed Cooper pairs could exist in a superconductor above its zero-resistance state has been explored for unconventional, interface, and disordered superconductors…
Flat bands with fragile topology through superlattice engineering on single-layer graphene
Anastasiia Skurativska, Stepan S. Tsirkin, Fabian D Natterer +2
'Magic'-angle twisted bilayer graphene has received a lot of interest due to its flat bands with potentially non-trivial topology that lead to intricate correlated phases. A spectr…
Towards a Topological Quantum Chemistry description of correlated systems: the case of the Hubbard diamond chain
Mikel Iraola, Niclas Heinsdorf, Apoorv Tiwari +9
The recently introduced topological quantum chemistry (TQC) framework has provided a description of universal topological properties of all possible band insulators in all space gr…
Broken-Symmetry Ground States of the Heisenberg model on the Pyrochlore Lattice
Nikita Astrakhantsev, Tom Westerhout, Apoorv Tiwari +5
The spin-1/2 Heisenberg model on the pyrochlore lattice is an iconic frustrated three-dimensional spin system with a rich phase diagram. Besides hosting several ordered phases, the…
Construction of low-energy symmetric Hamiltonians and Hubbard parameters for twisted multilayer systems using ab-initio input
Arkadiy Davydov, Kenny Choo, Mark H. Fischer +1
A computationally efficient workflow for obtaining the low-energy symmetric tight-binding Hamiltonians for twisted multilayer systems is presented in this work. We apply this schem…
Algorithmic Error Mitigation Scheme for Current Quantum Processors
Philippe Suchsland, Francesco Tacchino, Mark H. Fischer +3
We present a hardware agnostic error mitigation algorithm for near term quantum processors inspired by the classical Lanczos method. This technique can reduce the impact of differe…