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A tunable room-temperature nonlinear Hall effect in elemental bismuth thin films - Nature Electronics
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The nonlinear Hall effect with time-reversal symmetry is a second-order electronic transport phenomenon—seen as a quadratic voltage transverse to an applied electric field—that induces frequency doubling and occurs in non-centrosymmetric crystals with large Berry curvature. Optoelectronic devices based on this effect are limited because it typically appears at low temperatures and in complex compounds characterized by Dirac or Weyl electrons.
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