A. Gozar
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View article: Intermediate band analysis in Green's function calculations of quasiparticle interference
Intermediate band analysis in Green's function calculations of quasiparticle interference Open
The measurement of quasiparticle scattering patterns on material surfaces using scanning tunneling microscopy (STM) is now an established technique for accessing the momentum-resolved electronic band structure of solids. However, since the…
View article: Landau-phonon polaritons in Dirac heterostructures
Landau-phonon polaritons in Dirac heterostructures Open
Polaritons are light-matter quasiparticles that govern the optical response of quantum materials at the nanoscale, enabling on-chip communication and local sensing. Here, we report Landau-phonon polaritons (LPPs) in magnetized charge-neutr…
View article: Detection of a two-phonon mode in a cuprate superconductor via polarimetric resonant inelastic x-ray scattering
Detection of a two-phonon mode in a cuprate superconductor via polarimetric resonant inelastic x-ray scattering Open
Recent improvements in the energy resolution of resonant inelastic x-ray scattering experiments (RIXS) at the Cu-L3 edge have enabled the study of lattice, spin, and charge excitations. Here, we report on the detection of a low-intensity s…
View article: Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\textrm{Fe}\textrm{Se}_{1-x}\textrm{S}_{x}$
Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\textrm{Fe}\textrm{Se}_{1-x}\textrm{S}_{x}$ Open
Nematic phases, where electrons in a solid spontaneously break rotational symmetry while preserving the translational symmetry, exist in several families of unconventional superconductors [1, 2]. Although superconductivity mediated by nema…
View article: Nano-Imaging of Landau-Phonon Polaritons in Dirac Heterostructures
Nano-Imaging of Landau-Phonon Polaritons in Dirac Heterostructures Open
Polaritons are light-matter quasiparticles that govern the optical response of quantum materials and enable their nanophotonic applications. We have studied a new type of polaritons arising in magnetized graphene encapsulated in hexagonal …
Electronic stripe patterns near the fermi level of tetragonal Fe(Se,S) Open
FeSe 1− x S x remains one of the most enigmatic systems of Fe-based superconductors. While much is known about the orthorhombic parent compound, FeSe, the tetragonal samples, FeSe 1− x S x with x > 0.17, remain relatively unexplored. Here,…
View article: Detection of a two-phonon mode in a cuprate superconductor via polarimetric RIXS
Detection of a two-phonon mode in a cuprate superconductor via polarimetric RIXS Open
Recent improvements in the energy resolution of resonant inelastic x-ray scattering experiments (RIXS) at the Cu-L$_3$ edge have enabled the study of lattice, spin, and charge excitations. Here, we report on the detection of a low intensit…
View article: Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S)
Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S) Open
FeSe$_{1-x}$S$_x$ remains one of the most enigmatic systems of Fe-based superconductors. While much is known about the orthorhombic parent compound, FeSe, the tetragonal samples, FeSe$_{1-x}$S$_x$ with x>0.17, remain relatively unexplored.…
View article: Infrared Nano-Imaging of Dirac Magnetoexcitons in Graphene
Infrared Nano-Imaging of Dirac Magnetoexcitons in Graphene Open
Magnetic fields can have profound effects on the motion of electrons in quantum materials. Two-dimensional (2D) electron systems subject to strong magnetic fields are expected to exhibit quantized Hall conductivity, chiral edge currents, a…
Scattering-type scanning near-field optical microscopy with Akiyama piezo-probes Open
Recent developments of the scattering-type scanning near-field optical microscope at cryogenic temperatures (cryogenic s-SNOM or cryo-SNOM) have led to many breakthroughs in the studies of low energy excitations in quantum materials. Howev…
View article: Large response of charge stripes to uniaxial stress in $\textrm{La}_{1.475}\textrm{Nd}_{0.4}\textrm{Sr}_{0.125}\textrm{Cu}\textrm{O}_{4}$
Large response of charge stripes to uniaxial stress in $\textrm{La}_{1.475}\textrm{Nd}_{0.4}\textrm{Sr}_{0.125}\textrm{Cu}\textrm{O}_{4}$ Open
The La-based '214' cuprates host several symmetry breaking phases including superconductivity, charge and spin order in the form of stripes, and a structural othorhombic-to-tetragonal phase transition. Therefore, these materials are an ide…
Surface Josephson plasma waves in a high-temperature superconductor Open
Electron density oscillations with acoustic dispersions and sustained at boundaries between different media provide information about surface and interface properties of hetero-structures. In ultra-thin metallic films these plasmonic excit…
Tuning two-dimensional phase formation through epitaxial strain and growth conditions: silica and silicate on Ni<sub>x</sub>Pd<sub>1−x</sub>(111) alloy substrates Open
The combined experimental and theoretical results demonstrate the manipulation of 2D VDW silica and 2D Ni silicate through growth conditions, and the determination of the maximum epitaxial strain imparted to the 2D system through alloy sub…
Optical Nanoscopy of High <i>T</i><sub>c</sub> Cuprate Nanoconstriction Devices Patterned by Helium Ion Beams Open
Helium ion beams (HIB) focused to subnanometer scales have emerged as powerful tools for high-resolution imaging as well as nanoscale lithography, ion milling, or deposition. Quantifying irradiation effects is an essential step toward reli…
High-precision measurement of magnetic penetration depth in superconducting films Open
The magnetic penetration depth (λ) in thin superconducting films is usually measured by the mutual inductance technique. The accuracy of this method has been limited by uncertainties in the geometry of the solenoids and in the film positio…