Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: CE: Low-dimensional Systems - Materials 3

TT 35.17: Talk

Wednesday, March 16, 2011, 18:45–19:00, HSZ 301

Tomonaga-Luttinger Liquid Behavior in Atomic-Scale Gold Chains on a Semiconductor — •Christian Blumenstein¹, Jörg Schäfer¹, Sebastian Meyer¹, Sebastian Mietke², Michael Lochner², Rene Matzdorf² und Ralph Claessen¹ — ¹Physikalisches Institut, Universität Würzburg — ²Institut für Physik, Universität Kassel

Atomic nanowires formed by self-organization of metal adatoms on semiconductor surfaces 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-induced chains on Ge(001) have been prepared [1], which are structurally and electronically of exceptional one-dimensional (1D) character. Therefore they provide an opportunity to study 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 corresponding exponent α is found 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, opening new possibilities to probe modified interactions from specific atomic configurations.
J. Schäfer et al., Phys. Rev. Lett. 101, 236802 (2008).