A5092912243- Physics of Superconductivity and Magnetism
- Inorganic Chemistry and Materials
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Inorganic Fluorides and Related Compounds
- Graphene research and applications
- Advanced Condensed Matter Physics
- Luminescence Properties of Advanced Materials
Stanford University
2023-2025
SLAC National Accelerator Laboratory
2023-2025
California Institute of Technology
2024
Recent studies of La_{3}Ni_{2}O_{7} have identified a bilayer (2222) structure and an unexpected alternating monolayer-trilayer (1313) structure, both which feature signatures superconductivity near 80 K under high pressures. Using angle-resolved photoemission spectroscopy, we measure the electronic 1313 samples. In contrast to previously studied 2222 find that hosts flat band with markedly different binding energy, as well additional electron pocket splittings. By comparison local-density...
In the underdoped n-type cuprate Nd
Quantum anomalous Hall (QAH) state in six quintuple layer ${\mathrm{Cr}}_{0.1}{({\mathrm{Bi}}_{0.2}{\mathrm{Sb}}_{0.8})}_{1.9}{\mathrm{Te}}_{3}$ thin films were studied through scanning tunneling spectroscopy (STS) and electrical transport measurements. While the surface is gapless above Curie temperature (${T}_{\mathrm{C}}\ensuremath{\approx}30$ K), of sample reveals a topologically nontrivial gap with an average value $\ensuremath{\approx}13.5$ meV at 4.2 K below ferromagnetic transition....
Signatures of superconductivity near 80 K were recently discovered in crystals La-Ni-O with the stoichiometry 3:2:7 under high pressures. Structural studies have shown conflicting results highlighting both expected bilayer (2222) structure and an unexpected alternating monolayer-trilayer (1313) structure, apparently showing superconductivity. Here, we perform angle-resolved photoemission spectroscopy on 1313 to elucidate distinct electronic features compared previously studied 2222...
In the underdoped n-type cuprate Nd2-xCexCuO4, long-ranged antiferromagnetic order reconstructs Fermi surface, resulting in a putative metal with small pockets. Using angle-resolved photoemission spectroscopy, we observe an anomalous energy gap, of magnitude smaller than wide range regime and smoothly connecting to superconducting gap at optimal doping. After carefully considering all known ordering tendencies tandem phase diagram, hypothesize that normal state cuprates originates from...