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Fate of Time-Reversal Symmetry Breaking in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>UTe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Topological superconductivity is a long-sought state of matter in bulk materials, and the odd-parity superconductor UTe2 is a prime candidate. The recent observation of a field-trainable spontaneous Kerr signal in UTe2 at the onset of superconductivity provides strong evidence that the superconducting order parameter is multicomponent and breaks time-reversal symmetry. …