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Hidden one-dimensional electronic structure and non-Fermi-liquid angle-resolved photoemission line shapes of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>η</mml:mi><mml:mtext>‐</mml:mtext><mml:msub><mml:mi mathvariant="normal">Mo</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>11</mml:mn></mml:msub></mml:mrow></mml:math>
We report angle-resolved photoemission spectra (ARPES) of $\ensuremath{\eta}\text{\penalty1000-\hskip0pt}{\mathrm{Mo}}_{4}{\mathrm{O}}_{11}$, a layered metal that undergoes two-charge density wave (CDW) transitions at $109\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and $30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We have directly observed the ``hidden one-dimensional (hidden 1D)'' Fermi surface and an anisotropic gap opening associated with the $109\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ transition, in agreement with the band theoretical description …