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We report angle resolved photoemission (ARPES) spectra of$\eta$-Mo$_4$O$_{11}$, a layered metal that undergoes two charge density wave(CDW) transitions at 109 K and 30 K. We have directly observed the ``hiddenone-dimensional (hidden-1d)'' Fermi surface and an anisotropic gap openingassociated with the 109 K transition, in agreement with the band theoreticaldescription of the CDW transition. In addition, as in other hidden-1d materialssuch as NaMo$_6$O$_{17}$, the ARPES line shapes show certain anomalies, whichwe discuss in terms of non-Fermi liquid physics and possible roles of disorder.Comment: 3 figures; Erratum added to include missed reference

physical review. b, condensed matter and materials physics

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>

Hidden one-dimensional electronic structure and non-Fermi-liquid angle-resolved photoemission line shapes ofη‐Mo4O11