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J. Schäfer, C. Blumenstein, S. Meyer, R. Claessen - Physikalisches Institut, Universität Würzburg S. Mietke, R. Matzdorf - Institut für Physik, Universität Kassel Atomic nanowires at semiconductor surfaces formed by self-organization offer a vast playground for physics in low dimensions. While effects like a charge density wave were reported there, the quest for the observation of Tomonaga-Luttinger liquid (TLL) behavior has been ongoing. Recently, Au chains on Ge(001) have emerged as being structurally and electronically of exceptionally well-defined one-dimensional character [1]. Therefore these chains represent a new playground for exotic 1D physics. The talk will address the electronic properties of these Au chains, which have been investigated by scanning tunneling spectroscopy (STS) and angle-resolved photoemission (ARPES) over a wide temperature range. A power-law behavior in the density of states upon energy has been discovered, characteristic of a TLL. The exponent α is observed independently by both STS and ARPES. Furthermore, universal scaling behavior is observed as a hallmark of TLL physics. This renders the Au/Ge(001) chains the first TLL system at a crystal surface. [1] J. Schäfer et al., Phys. Rev. Lett. 101, 236802 (2008). |
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