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HL: Fachverband Halbleiterphysik

HL 115: Symposium SYOM: One-dimensional metals - Reality or fiction?

HL 115.4: Invited Talk

Friday, April 4, 2014, 11:50–12:30, HSZ 02

Atomic nanowires on surfaces: Spectroscopic reality versus theoretical fiction — Ralph Claessen and •Jörg Schäfer — Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Solids with electrons confined to only one spatial dimension are predicted to behave quite different from conventional metals. Many-body theory finds that electronic interactions may lead to Peierls-type instabilities or even a breakdown of Landau’s quasiparticle picture, which works so well in higher dimensions. Atomic nanowires formed by self-organized growth of metal atoms on suitable semiconductor surfaces can be viewed as closest approach to perfect 1D electron confinement, and therefore serve well as model systems for experimental tests of the expected 1D physics. In my presentation I will discuss current experiments on atomic nanowires, using photoelectron spectroscopy and scanning tunneling microscopy as experimental probes, and compare the results to corresponding theoretical predictions. Examples include the observation of Tomonaga-Luttinger behavior as well as the possible detection of (quasi-)1D antiferromagnetic order.