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Articles by Congcong Le
Resolving phonons in superconductor Bi 2 Sr 2 CaCu 2 O 8+δ at sub-unit-cell resolution
Abstract The role of phonons in cuprates remains controversial, with their complex lattice structure complicating the investigation. Here, we identify phonon modes originating from charge reservoir and superconducting layers of Bi2Sr2CaCu2O8+δ using sub-unit-cell resolved electron energy loss spectroscopy in a scanning transmission electron microscope.
Mirror-selective quasiparticle interference in bilayer nickelate superconductor
Abstract The recent discovery of high-temperature superconductivity in bilayer nickelates has attracted widespread interest, yet the electronic structure and pairing symmetry essential for superconductivity remain debated. Here, inspired by recent STM experiments on thin films, we investigate the quasiparticle interference (QPI) of bilayer nickelates in both normal and superconducting states.
Impact of nonlocal Coulomb repulsion on superconductivity and density-wave orders in bilayer nickelates
Abstract The recent discovery of high-temperature superconductivity in pressurized bilayer nickelate La3Ni2O7 and its thin films has sparked considerable interest in unraveling their pairing mechanisms and correlated electronic states. While earlier theoretical studies have primarily focused on onsite Coulomb interactions, the impact of nonlocal Coulomb repulsion has remained largely unexplored.
Magnetic coupled electronic landscape in bilayer-distorted titanium-based kagome metals
Quantum materials whose atoms are arranged on a lattice of corner-sharing triangles, i.e., the kagome lattice, have recently emerged as a captivating platform for investigating exotic correlated and topological electronic phenomena.
Non-trivial band topology and orbital-selective electronic nematicity in a titanium-based kagome superconductor - Nature Physics
Abstract Electronic nematicity that spontaneously breaks rotational symmetry is a generic phenomenon in correlated quantum systems including high-temperature superconductors and the AV3Sb5 (A can be K, Rb or Cs) family of kagome superconductors. However, the underlying mechanism of nematicity in these systems is hard to identify because of its entanglement with other ordered phases.
Thermoelectric properties of n-type half-Heusler NbCoSn with heavy-element Pt substitution
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