Jonathan Pelliciari
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View article: Structural origin of resonant diffraction in RuO$_2$
Structural origin of resonant diffraction in RuO$_2$ Open
We report Ru L$_3$-edge resonant X-ray diffraction studies on single crystal and (001) epitaxial films of RuO$_2$. We investigate the distinct $\mathbf{Q} = (100)$ and $(001)$ reflections as a function of incident energy, azimuthal angle, …
View article: Observing differential spin currents by resonant inelastic X-ray scattering
Observing differential spin currents by resonant inelastic X-ray scattering Open
View article: Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe4.75GeTe2
Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe4.75GeTe2 Open
Understanding the ground state of van der Waals (vdW) magnets is crucial for designing devices leveraging these platforms. Here, we investigate the magnetic excitations and charge order in Fe4.75GeTe2, a vdW ferromagnet with ≈ 315 K Curie …
View article: Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe4.75GeTe2
Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe4.75GeTe2 Open
View article: Characterizing sample degradation from synchrotron based X-ray measurements of ultra-thin exfoliated flakes
Characterizing sample degradation from synchrotron based X-ray measurements of ultra-thin exfoliated flakes Open
It is undeniable that novel 2D devices and heterostructures will have a lasting impact on the advancement of future technologies. However, the inherent instability of many exfoliated van der Waals (vdW) materials is a well-known hurdle yet…
View article: Anisotropic electron damping and energy gap in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Anisotropic electron damping and energy gap in Open
The many-body electron-electron interaction in cuprates causes broadening of the electronic bands in k space, leading to a deviation from the standard Fermi liquid. While a k-dependent anisotropic electronic scattering (k-DAES) has been as…
View article: Unconventional polaronic ground state in superconducting LiTi$_2$O$_4$
Unconventional polaronic ground state in superconducting LiTi$_2$O$_4$ Open
Geometrically frustrated lattices can display a range of correlated phenomena, ranging from spin frustration and charge order to dispersionless flat bands due to quantum interference. One particularly compelling family of such materials is…
View article: Superconductivity in the Parent Infinite-Layer Nickelate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>NdNiO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Superconductivity in the Parent Infinite-Layer Nickelate Open
We report evidence for superconductivity with onset temperatures up to 11 K in thin films of the infinite-layer nickelate parent compound NdNiO2. A combination of oxide molecular beam epitaxy and atomic hydrogen reduction yields samples wi…
View article: Beyond-Hubbard Pairing in a Cuprate Ladder
Beyond-Hubbard Pairing in a Cuprate Ladder Open
The Hubbard model is believed to capture the essential physics of cuprate superconductors. However, recent theoretical studies suggest that it fails to reproduce a robust and homogeneous superconducting ground state. Here, using resonant i…
View article: Magnetic excitations in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Nd</mml:mi><mml:mrow><mml:mi>n</mml:mi><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mi>n</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mi>n</mml:mi><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Ruddlesden-Popper nickelates observed via resonant inelastic x-ray scattering
Magnetic excitations in Ruddlesden-Popper nickelates observed via resonant inelastic x-ray scattering Open
Magnetic interactions are thought to play a key role in the properties of many unconventional superconductors, including cuprates, iron pnictides, and square-planar nickelates. Superconductivity was also recently observed in the bilayer an…
View article: Doping Dependence of 2-Spinon Excitations in the Doped 1D Cuprate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>
Doping Dependence of 2-Spinon Excitations in the Doped 1D Cuprate Open
Recent photoemission experiments on the quasi-one-dimensional Ba-based cuprates suggest that doped holes experience an attractive potential not captured using the simple Hubbard model. This observation has garnered significant attention du…
View article: Electronic structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ir</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math> probed by resonant inelastic x-ray scattering at the oxygen <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>K</mml:mi></mml:mrow></mml:math> edge: Metallicity, hybridization, and electronic correlations
Electronic structure of probed by resonant inelastic x-ray scattering at the oxygen edge: Metallicity, hybridization, and electronic correlations Open
The electronic structure of metallic Bi2Ir2O7 has been investigated by a combination of soft x-ray absorption spectroscopy, x-ray emission spectroscopy (XES), and resonant inelastic x-ray scattering (RIXS) in the vicinity of the oxygen K e…
View article: Exploring a New Regime of Molecular Orbital Physics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>4</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math> Cluster Magnets with Resonant Inelastic X-Ray Scattering
Exploring a New Regime of Molecular Orbital Physics in Cluster Magnets with Resonant Inelastic X-Ray Scattering Open
Molecular orbital systems with clusters of heavy transition metal (TM) ions are one of the most important classes of model materials for studying the interplay between local physics and effects of itinerancy. Despite a large number of cand…
View article: Topotactic Reduction-Driven Crystal Field Excitations in Brownmillerite Manganite Thin Films
Topotactic Reduction-Driven Crystal Field Excitations in Brownmillerite Manganite Thin Films Open
Topotactic reduction of perovskite oxides offers a powerful approach for discovering novel phenomena, such as superconducting infinite-layer nickelates and polar metallicity, and is commonly accompanied by the emergence of multiple valence…
View article: Dispersive Dark Excitons in van der Waals Ferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CrI</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Dispersive Dark Excitons in van der Waals Ferromagnet Open
Spin-flip dark excitons are optical-dipole-forbidden quasiparticles with remarkable potential in optoelectronics, especially when they are realized within cleavable van der Waals materials. Despite this potential, dark excitons have not ye…
View article: Coupling of electronic transition to ferroelectric order in a 2D semiconductor
Coupling of electronic transition to ferroelectric order in a 2D semiconductor Open
View article: Topotactic Reduction‐Driven Crystal Field Excitations in Brownmillerite Manganite Thin Films
Topotactic Reduction‐Driven Crystal Field Excitations in Brownmillerite Manganite Thin Films Open
Topotactic reduction of perovskite oxides offers a powerful approach for discovering novel phenomena, such as superconducting infinite‐layer nickelates and polar metallicity, and is commonly accompanied by the emergence of multiple valence…
View article: Spin-forbidden excitations in the magneto-optical spectra of CrI$_3$ tuned by covalency
Spin-forbidden excitations in the magneto-optical spectra of CrI$_3$ tuned by covalency Open
Spin-forbidden ($ΔS \neq 0$) multiplet excitations and their coupling to magnetic properties are of increasing importance for magneto-optical studies of correlated materials. Nonetheless, the mechanisms for optically brightening these tran…
View article: Beyond-Hubbard pairing in a cuprate ladder
Beyond-Hubbard pairing in a cuprate ladder Open
The Hubbard model is believed to capture the essential physics of cuprate superconductors. However, recent theoretical studies suggest that it fails to reproduce a robust and homogeneous superconducting ground state. Here, using resonant i…
View article: Dispersive dark excitons in van der Waals ferromagnet CrI3
Dispersive dark excitons in van der Waals ferromagnet CrI3 Open
Spin-flip dark excitons are optical-dipole-forbidden quasiparticles with remarkable potential in optoelectronics, especially when they are realized within cleavable van der Waals materials. Despite this potential, dark excitons have not ye…
View article: Dynamic Interplay of Nonlocal Recombination Pathways in Quantum Emitters in Hexagonal Boron Nitride
Dynamic Interplay of Nonlocal Recombination Pathways in Quantum Emitters in Hexagonal Boron Nitride Open
Optically active defects in wide bandgap materials play a central role in several emerging applications in quantum information and sensing as they allow for manipulating and harvesting the internal degrees of freedom of single electrons wi…
View article: Resonant inelastic x-ray scattering in the topological semimetal FeSi
Resonant inelastic x-ray scattering in the topological semimetal FeSi Open
The energy spectrum of topological semimetals contains protected degeneracies in reciprocal space that correspond to Weyl, Dirac, or multifold fermionic states. To exploit the unconventional properties of these states, one has to access th…
View article: Coupling of Electronic Transitions to Ferroelectric Order in a 2D Semiconductor
Coupling of Electronic Transitions to Ferroelectric Order in a 2D Semiconductor Open
A ferroelectric material often exhibits a soft transvers optical (TO) phonon mode which governs it phase transition. Charge coupling to this ferroelectric soft mode may further mediate emergent physical properties, including superconductiv…
View article: Nature of Excitons and Their Ligand-Mediated Delocalization in Nickel Dihalide Charge-Transfer Insulators
Nature of Excitons and Their Ligand-Mediated Delocalization in Nickel Dihalide Charge-Transfer Insulators Open
The fundamental optical excitations of correlated transition-metal compounds are typically identified with multielectronic transitions localized at the transition-metal site, such as dd transitions. In this vein, intense interest has surro…
View article: Magnetic excitations in strained infinite-layer nickelate PrNiO2 films
Magnetic excitations in strained infinite-layer nickelate PrNiO2 films Open
View article: General algorithm for characterization of donor-acceptor pair recombination processes in solid-state materials
General algorithm for characterization of donor-acceptor pair recombination processes in solid-state materials Open
Radiative recombination processes can occur in solid-state systems through the pairing of donor and acceptor defects of the lattice. Recently, donor-acceptor pairs (DAP) have been proposed as promising candidates for quantum applications, …
View article: Highly Tunable Ru-dimer Molecular Orbital State in 6H-perovskite Ba$_3$MRu$_2$O$_9$
Highly Tunable Ru-dimer Molecular Orbital State in 6H-perovskite Ba$_3$MRu$_2$O$_9$ Open
Molecular orbital (MO) systems with clusters of heavy transition metal (TM) ions are one of the most important classes of model materials for studying the interplay between local physics and effects of itinerancy. Despite a large number of…
View article: Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3
Magnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3 Open
Magnetic van der Waals (vdW) materials have opened new frontiers for realizing novel many-body phenomena. Recently NiPS 3 has received intense interest since it hosts an excitonic quasiparticle whose properties appear to be intimately link…
View article: Elementary excitations of single-photon emitters in hexagonal boron nitride
Elementary excitations of single-photon emitters in hexagonal boron nitride Open
View article: Nature of excitons and their ligand-mediated delocalization in nickel dihalide charge-transfer insulators
Nature of excitons and their ligand-mediated delocalization in nickel dihalide charge-transfer insulators Open
The fundamental optical excitations of correlated transition-metal compounds are typically identified with multielectronic transitions localized at the transition-metal site, such as $dd$ transitions. In this vein, intense interest has sur…