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Abstract
We studied the spectral functions of URu${}_{2}$Si${}_{2}$ in the hidden-order state by means of ultrahigh-resolution angle-resolved photoemission spectroscopy. High signal-to-noise ratio data uncover the existence of two anomalous fine structures, namely a ``splitting'' in the previously reported narrow dispersive band, and a small, dispersionless ``satellite'' structure. These structures can be explained by neither ordinary bands nor the development of a hybridization of two states; thus our observation should evoke the consideration of complicated many-body effects. As a possible origin, we suggest the existence of electron-mode coupling in the ordered state.
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