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Creators/Authors contains: "Ghosh, Barun"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Communications Materials)
    Kagome lattices have emerged as an ideal platform for exploring exotic quantum phenomena in materials. Here, we report the discovery of Ti-based kagome metal YbTi3Bi4 which we characterize using angle-resolved photoemission spectroscopy (ARPES) and magneto-transport, in combination with density functional theory calculations. Our ARPES results reveal the complex fermiology of YbTi3Bi4 and provide spectroscopic evidence of four flat bands. Our measurements also show the presence of multiple van Hove singularities originating from Ti 3d orbitals and a linearly-dispersing gapped Dirac-like bulk state at the point in accord with our theoretical calculations. Our study establishes YbTi3Bi4 as a platform for exploring exotic phases in the wider LnTi3Bi4 (Ln = lanthanide) family of materials. 
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    Free, publicly-accessible full text available December 1, 2025
  2. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)
  3. ; ; ; ; ; ; ; ; ; ; et al (, Nature)
    Free, publicly-accessible full text available May 1, 2026
  4. ; ; ; ; ; ; ; ; ; ; et al (, Nature Electronics)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, Science)
    Quantum geometry in condensed-matter physics has two components: the real part quantum metric and the imaginary part Berry curvature. Whereas the effects of Berry curvature have been observed through phenomena such as the quantum Hall effect in two-dimensional electron gases and the anomalous Hall effect (AHE) in ferromagnets, the quantum metric has rarely been explored. Here, we report a nonlinear Hall effect induced by the quantum metric dipole by interfacing even-layered MnBi2Te4with black phosphorus. The quantum metric nonlinear Hall effect switches direction upon reversing the antiferromagnetic (AFM) spins and exhibits distinct scaling that is independent of the scattering time. Our results open the door to discovering quantum metric responses predicted theoretically and pave the way for applications that bridge nonlinear electronics with AFM spintronics. 
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  6. ; ; ; ; ; ; ; ; ; ; et al (, Nature Materials)
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  7. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)
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  8. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)
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  9. ; ; ; ; ; ; ; ; ; ; et al (, Nature)
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