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arxiv 2103.05584 v2 pith:CNXMCU7H submitted 2021-03-09 cond-mat.mtrl-sci

Spectroscopic evidence for a new type of surface resonance at noble metal surfaces

classification cond-mat.mtrl-sci
keywords surfacealongbulk-likecharactercrystaldirectiongammametal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the surface- and bulk-like properties of the pristine (110)-surface of silver using threshold photoemission by excitation with light of 5.9 eV. Using a momentum microscope, we identified two distinct transitions along the $\overline{\Gamma}\,\overline{\textrm{Y}}$-direction of the crystal. The first one is a so far unknown surface resonance for the (110) noble metal surface, exhibiting an exceptionally large bulk character, that has so far been elusive in surface sensitive experiments. The second one stems from the well known bulk-like Mahan cone oriented along the $\Gamma L$-direction inside the crystal but projected onto the (110)-surface cut. The existence of the new state is confirmed by photocurrent calculations and its character analyzed.

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