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Observation of Dirac-like energy band and unusual spectral line shape in quasi-one-dimensional superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Tl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Mo</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
We have performed high-resolution angle-resolved photoemission spectroscopy of the quasi-one-dimensional (1D) topological superconductor candidate ${\mathrm{Tl}}_{2}{\mathrm{Mo}}_{6}{\mathrm{Se}}_{6}$ consisting of weakly coupled ${\mathrm{Mo}}_{3}{\mathrm{Se}}_{3}$ chains. We found a quasi-1D Fermi surface arising from a Dirac-like energy band, which is associated with the nonsymmorphic screw symmetry of the chains and predicted to trigger topological superconductivity. …