Publications (32)
Concurrent Multifractality and Anomalous Hall Response in the Nodal Line Semimetal FeGeTe Near Localization
Subramanian Mathimalar, Ambikesh Gupta, Yotam Roet +19
Topological states of matter exhibit unique protection against scattering by disorder. Different topological classes exhibit distinct forms and degrees of protection. Here, we inve…
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…
Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in SrRuO
Carolina A. Marques, Philip A. E. Murgatroyd, Rosalba Fittipaldi +19
Van Hove singularities (VHss) in the vicinity of the Fermi energy often play a dramatic role in the physics of strongly correlated electron materials. The divergence of the density…
Searching for the signature of a pair density wave in YBaCuO using high energy X-ray diffraction
Elizabeth Blackburn, Oleh Ivashko, Emma Campillo +7
We have carried out a search for a pair density wave signature using high-energy X-ray diffraction in fields up to 16 T. We do not see evidence for a signal at the predicted waveve…
Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor
Chun Lin, Armando Consiglio, Ola Kenji Forslund +17
Tunable quantum materials hold great potential for applications. Of special interest are materials in which small lattice strain induces giant electronic responses. The kagome comp…
Direct High-Magnetic-Field Coupling to Stripe Order in a Cuprate Superconductor
Leonardo Martinelli, Izabela BiaÅo, Jens Oppliger +47
Superconductivity in cuprates emerges out of a complex normal state that hosts density waves, pseudogap physics, and strange metal properties. Here, we access this normal state by…
Two-carrier Magnetoresistance: Applications to CaRuO
Lakshmi Das, Yang Xu, Tian Shang +13
Ambipolar transport is a commonly occurring theme in semimetals and semiconductors. Here we present an analytical formulation of the conductivity for a two-band system. Electron an…
Direct Observation of Orbital Hybridisation in a Cuprate Superconductor
Christian E. Matt, D. Sutter, A. M. Cook +23
The minimal ingredients to explain the essential physics of layered copper-oxide (cuprates= materials remains heavily debated. Effective low energy single-band models of the copper…
Anatomy of anomalous Hall effect due to magnetic fluctuations
Ola Kenji Forslund, Xiaoxiong Liu, Soohyeon Shin +16
The anomalous Hall {\color{black} e}ffect (AHE) has emerged as a key indicator of time-reversal symmetry breaking (TRSB) and topological features in electronic band structures. Abs…
Persistent paramagnons in high-temperature infinite-layer nickelate superconductors
Yujie Yan, Ying Chan, Xunyang Hong +25
The recent discovery of high-temperature superconductivity in hole-doped SmNiO, exhibiting the record-high transition temperature among infinite-layer (IL) nickelates, ha…
Resonant Soft X-Ray Scattering on LaPtSi
Deepak John Mukkattukavil, Johan Hellsvik, Anirudha Ghosh +15
X-ray absorption (XAS) and Resonant Inelastic X-ray Scattering (RIXS) spectra of LaPtSi single crystal at the Si L and La N edges are presented. The data are interpreted in…
Spin fluctuations sufficient to mediate superconductivity in nickelates
Paul Worm, Qisi Wang, Motoharu Kitatani +12
Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (…
Collective spin excitations in trilayer nickelate LaNiO
Ying Chan, Yuehong Li, Yujie Yan +14
Ruddlesden-Popper (RP) nickelates have recently emerged as a new family of high-temperature superconductors. In bilayer RP nickelates, magnetic excitations with large exchange coup…
Extreme Strain Controlled Correlated Metal-Insulator Transition in the Altermagnet CrSb
Cong Li, Mengli Hu, Jianfeng Zhang +14
Correlated flat bands and altermagnetism are two important directions in quantum materials, centred respectively on interaction-dominated phases and symmetry-enforced spin-textured…
Topological Metal-Insulator Transition within the Ferromagnetic state
Ola Kenji Forslund, Chin Shen Ong, Moritz M. Hirschmann +20
A major challenge in condensed matter physics is integrating topological phenomena with correlated electron physics to leverage both types of states for next-generation quantum dev…
Superconducting fluctuations in a thin NbN film probed by the Hall effect
Daniel Destraz, Konstantin Ilin, Michael Siegel +2
We present a comprehensive study of how superconducting fluctuations in the normal state contribute to the conductivity tensor in a thin (119 ) film of NbN. It is shown how the…
Hidden magnetism at the pseudogap critical point of a high temperature superconductor
Mehdi Frachet, Igor Vinograd, Rui Zhou +17
The mysterious pseudogap phase of cuprate superconductors ends at a critical hole doping level p* but the nature of the ground state below p* is still debated. Here, we show that t…
Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field Hall effect measurements
David LeBoeuf, Nicolas Doiron-Leyraud, B. Vignolle +14
The Hall coefficient R_H of the cuprate superconductor YBa2Cu3Oy was measured in magnetic fields up to 60 T for a hole concentration p from 0.078 to 0.152, in the underdoped regime…
Orbitally selective breakdown of Fermi liquid quasiparticles in CaSrRuO
Denys Sutter, Minjae Kim, Christian Matt +16
We present a comprehensive angle-resolved photoemission spectroscopy study of CaSrRuO. Four distinct bands are revealed and along the Ru-O bond direction their…
Probing enhanced superconductivity in van der Waals polytypes of VTaS
Wojciech R. Pudelko, Huanlong Liu, Francesco Petocchi +15
Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a…
Tuning of Charge Order by Uniaxial Stress in a Cuprate Superconductor
Laure Thomarat, Frank Elson, Elisabetta Nocerino +12
Strongly correlated electron materials are often characterized by competition and interplay of multiple quantum states. For example, in high-temperature cuprate superconductors unc…
Absence of bulk charge density wave order in the normal state of UTe
Caitlin S. Kengle, Jakub Vonka, Sonia Francoual +5
A spatially modulated superconducting state, known as pair density wave (PDW), is a tantalizing state of matter with unique properties. Recent scanning tunneling microscopy (STM) s…
Finite size melting of spherical solid-liquid aluminium interfaces
Johan Chang, Erik Johnson, Takamichi Sakai +1
We have investigated the melting of nano-sized cone shaped aluminium needles coated with amorphous carbon using transmission electron microscopy. The interface between solid and li…
Dispersive Magnetic and Electronic Excitations in Iridate Perovskites Probed with Oxygen -Edge Resonant Inelastic X-ray Scattering
Xingye Lu, Paul Olalde-Velasco, Yaobo Huang +11
Resonant inelastic X-ray scattering (RIXS) experiments performed at the oxygen- edge on the iridate perovskites {\SIOS} and {\SION} reveal a sequence of well-defined dispersive…
Crystal Symmetry of Stripe Ordered La1.88Sr0.12CuO4
Ruggero Frison, Julia Kuespert, Qisi Wang +12
We present a combined x-ray and neutron diffraction study of the stripe ordered superconductor \lscox{0.12}. The average crystal structure is consistent with the orthorhombic $Bmab…
Neural Network-based Classification of Crystal Symmetries from X-Ray Diffraction Patterns
Pascal Marc Vecsei, Kenny Choo, Johan Chang +1
Machine learning algorithms based on artificial neural networks have proven very useful for a variety of classification problems. Here we apply them to a well-known problem in crys…
Magnetotransport of dirty-limit van Hove singularity quasiparticles
Yang Xu, František Herman, Veronica Granata +13
Tuning of electronic density-of-states singularities is a common route to unconventional metal physics. Conceptually, van Hove singularities are realized only in clean two-dimensio…
Electronic excitations in the Shastry-Sutherland compound SrCu(BO)
Tariq Leinen, Ola K. Forslund, Eugenio Paris +13
SrCu2(BO3)2 (SCBO) is a paradigmatic realization of the Shastry-Sutherland model, hosting geometrically frustrated spin dimers and a variety of quantum magnetic phases and phenomen…
Polytypism and Superconductivity in the NbS System
Catherine Witteveen, Karolina Gornicka, Johan Chang +3
We report on the phase formation and the superconducting properties in the NbS system. Specifically, we have performed a series of standardized solid-state syntheses in this sy…
Anisotropic magnetic excitations and incipient Néel order in Ba(FeMn)As
Fernando A. Garcia, Oleh Ivashko, Daniel E. McNally +7
It is currently understood that high temperature superconductivity (SC) in the transition metal substituted iron arsenides Ba(Fe)As is promoted b…
Suppression of Spectral Gap and Flat Bands on a Cuprate Superconductor Side-Surface
Gabriele Domaine, Mihir Date, Sydney K. Y. Dufresne +27
Side surfaces of cuprate superconductors are expected to display a suppressed -wave order parameter and zero-energy topological flat bands with a large density of states, making…
Surface and bulk melting of small metal clusters
Johan Chang, Erik Johnson
We present an analytical solution to the two-parabola Landau model, applied to melting of metal particles with sizes in the nanoscale range. The results provide an analytical under…