Qisi Wang
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View article: Impact of Electron Correlations on Infinite-Layer Cuprates and Nickelates
Impact of Electron Correlations on Infinite-Layer Cuprates and Nickelates Open
Optimization of unconventional superconductivity involves a balance of interaction strengths. Precise determination of correlation strength across different material families is therefore important. Here, we present a combined X-ray absorp…
View article: Persistent paramagnons in high-temperature infinite-layer nickelate superconductors
Persistent paramagnons in high-temperature infinite-layer nickelate superconductors Open
The recent discovery of high-temperature superconductivity in hole-doped SmNiO$_2$, exhibiting the record-high transition temperature $T_c$ among infinite-layer (IL) nickelates, has opened a new avenue for exploring design principles of su…
View article: Decoupling of static and dynamic charge correlations revealed by uniaxial strain in a cuprate superconductor
Decoupling of static and dynamic charge correlations revealed by uniaxial strain in a cuprate superconductor Open
We use uniaxial strain in combination with ultra-high-resolution resonant inelastic x-ray scattering (RIXS) at the oxygen-K and copper-L3 edges to study the excitations stemming from the charge ordering wave vector in La1.875Sr0.125CuO4. B…
View article: Computer-based Simulation of Facial Flap and Cleft Lip Reconstruction Using Multiresolution Physics
Computer-based Simulation of Facial Flap and Cleft Lip Reconstruction Using Multiresolution Physics Open
Summary: Computer-based simulation of complex local flap reconstructions of the face requires very high-density finite elements to render accurately due to the intricate incision designs frequently used. This is particularly true in detail…
View article: Resolving the orbital character of low-energy excitations in Mott insulator with intermediate spin-orbit coupling
Resolving the orbital character of low-energy excitations in Mott insulator with intermediate spin-orbit coupling Open
Multi-band Mott insulators with moderate spin-orbit and Hund’s coupling are key reference points for theoretical concept developments of correlated electron systems. The ruthenate Mott insulator Ca 2 RuO 4 has therefore been intensively st…
View article: Anomalous Hall Effect due to Magnetic Fluctuations in a Ferromagnetic Weyl Semimetal
Anomalous Hall Effect due to Magnetic Fluctuations in a Ferromagnetic Weyl Semimetal Open
The anomalous Hall effect (AHE) has emerged as a key indicator of time-reversal symmetry breaking (TRSB) and topological features in electronic band structures. Absent of a magnetic field, the AHE requires spontaneous TRSB but has proven h…
View article: Enhanced Superconductivity and Mixed-dimensional Behaviour in Infinite-layer Samarium Nickelate Thin Films
Enhanced Superconductivity and Mixed-dimensional Behaviour in Infinite-layer Samarium Nickelate Thin Films Open
Rare-earth infinite-layer nickelates represent an emerging class of unconventional superconductors, with materials synthesis largely limited to early lanthanide compounds. Here, we report the synthesis and characterization of phase-pure su…
View article: Observation of collective charge excitations in a cuprate superconductor
Observation of collective charge excitations in a cuprate superconductor Open
Emergent symmetry breakings in condensed matter systems are often intimately linked to collective excitations. For example, the intertwined spin-charge stripe order in cuprate superconductors is associated with spin and charge excitations.…
View article: Anatomy of anomalous Hall effect due to magnetic fluctuations
Anatomy of anomalous Hall effect due to magnetic fluctuations Open
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. Absent of a magnetic field, the AHE requires spontaneous TRSB …
View article: Discovery of giant unit-cell super-structure in the infinite-layer nickelate PrNiO2+x
Discovery of giant unit-cell super-structure in the infinite-layer nickelate PrNiO2+x Open
View article: Probing enhanced superconductivity in van der Waals polytypes of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Probing enhanced superconductivity in van der Waals polytypes of Open
Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a promising route to manipulate TMDs' properties, not only a…
View article: Probing enhanced superconductivity in van der Waals polytypes of V$_x$TaS$_2$
Probing enhanced superconductivity in van der Waals polytypes of V$_x$TaS$_2$ Open
Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a promising route to manipulate TMDs' properties, not only a…
View article: Strain-tuned incompatible magnetic exchange-interaction in La2NiO4
Strain-tuned incompatible magnetic exchange-interaction in La2NiO4 Open
View article: Engineering phase competition between stripe order and superconductivity in La1.88Sr0.12CuO4
Engineering phase competition between stripe order and superconductivity in La1.88Sr0.12CuO4 Open
View article: Magnetic excitations in strained infinite-layer nickelate PrNiO2 films
Magnetic excitations in strained infinite-layer nickelate PrNiO2 films Open
View article: Magnon interactions in a moderately correlated Mott insulator
Magnon interactions in a moderately correlated Mott insulator Open
Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here w…
View article: Spin fluctuations sufficient to mediate superconductivity in nickelates
Spin fluctuations sufficient to mediate superconductivity in nickelates Open
Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (DΓA). Here, we compare the spin-fluctuation spectrum behind…
View article: Interplay between crystal field and magnetic anisotropy in the triangular-lattice antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">NaTmTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Interplay between crystal field and magnetic anisotropy in the triangular-lattice antiferromagnet Open
We have successfully synthesized a triangular lattice magnet, NaTmTe2, and conducted thermodynamic and inelastic neutron scattering (INS) investigations using single-crystal samples. Our magnetic susceptibility χ(T) measurements…
View article: Two-dimensional phase-fluctuating superconductivity in bulk crystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>NdO</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>BiS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Two-dimensional phase-fluctuating superconductivity in bulk crystalline Open
We present a combined growth and transport study of superconducting\nsingle-crystalline NdO$_{0.5}$F$_{0.5}$BiS$_2$. Evidence of two-dimensional\nsuperconductivity with significant phase fluctuations of preformed Cooper pairs\npreceding th…
View article: Weak signal extraction enabled by deep neural network denoising of diffraction data
Weak signal extraction enabled by deep neural network denoising of diffraction data Open
The removal or cancellation of noise has wide-spread applications in imaging and acoustics. In applications in everyday life, such as image restoration, denoising may even include generative aspects, which are unfaithful to the ground trut…
View article: Spin fluctuations sufficient to mediate superconductivity in nickelates
Spin fluctuations sufficient to mediate superconductivity in nickelates Open
Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (D$Γ$A). Here, we compare the spin-fluctuation spectrum behi…
View article: Resolving the Orbital Character of Low-energy Excitations in Mott Insulator with Intermediate Spin-orbit Coupling
Resolving the Orbital Character of Low-energy Excitations in Mott Insulator with Intermediate Spin-orbit Coupling Open
Multi-band Mott insulators with moderate spin-orbit and Hund's coupling are key reference points for theoretical concept developments of correlated electron systems. The ruthenate Mott insulator Ca$_{2}$RuO$_{4}$ has therefore been intensi…
View article: Engineering Phase Competition Between Stripe Order and Superconductivity in La$_{1.88}$Sr$_{0.12}$CuO$_4$
Engineering Phase Competition Between Stripe Order and Superconductivity in La$_{1.88}$Sr$_{0.12}$CuO$_4$ Open
Unconventional superconductivity often couples to other electronic orders in a cooperative or competing fashion. Identifying external stimuli that tune between these two limits is of fundamental interest. Here, we show that strain perpendi…
View article: Magnon interactions in a moderately correlated Mott insulator
Magnon interactions in a moderately correlated Mott insulator Open
Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here w…
View article: Revealing the Orbital Composition of Heavy Fermion Quasiparticles in CeRu<sub>2</sub>Si<sub>2</sub>
Revealing the Orbital Composition of Heavy Fermion Quasiparticles in CeRu<sub>2</sub>Si<sub>2</sub> Open
We present a resonant angle-resolved photoemission spectroscopy (ARPES) study of the electronic band structure and heavy fermion quasiparticles in CeRu2Si2. Using light polarization analysis, considerations of the crystal field environment…
View article: Strain-Tuned Magnetic Frustration in a Square Lattice $J_1$-$J_2$ Material
Strain-Tuned Magnetic Frustration in a Square Lattice $J_1$-$J_2$ Material Open
Magnetic frustration is a route that can lead to the emergence of novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either the geometry of lattice structures or by incompatible exchange i…
View article: Exchange renormalized crystal field excitation in a quantum Ising magnet KTmSe$_2$
Exchange renormalized crystal field excitation in a quantum Ising magnet KTmSe$_2$ Open
Rare-earth delafossite compounds, ARCh$_2$ (A = alkali or monovalent ion, R = rare earth, Ch = chalcogen), have been proposed for a range of novel quantum phenomena. Particularly, the Tm series, ATmCh$_2$, featuring Tm ions on a triangular…
View article: Spin Fluctuations in Sr$_{1.8}$La$_{0.2}$RuO$_4$
Spin Fluctuations in Sr$_{1.8}$La$_{0.2}$RuO$_4$ Open
We use inelastic neutron scattering to study spin fluctuations in Sr$_{1.8}$La$_{0.2}$RuO$_4$, where Lanthanum doping triggers a Lifshitz transition by pushing the van Hove singularity in the $γ$ band to the Fermi energy. Strong spin fluct…
View article: Two Distinct Charge Orders in Infinite-layer PrNiO2+δ revealed by Resonant X-ray Diffraction
Two Distinct Charge Orders in Infinite-layer PrNiO2+δ revealed by Resonant X-ray Diffraction Open
A broken translation symmetry has recently been revealed in infinite-layer nickelates, which has piqued considerable interest in its origin and relation to superconductivity, as well as in its comparison to charge order in cuprates. Here, …
View article: Fate of charge order in overdoped La-based cuprates
Fate of charge order in overdoped La-based cuprates Open
In high-temperature cuprate superconductors, stripe order refers broadly to a coupled spin and charge modulation with a commensuration of eight and four lattice units, respectively. How this stripe order evolves across optimal doping remai…