Dresden 2014 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 45: Poster IV: One-Dimensional Metals: Reality or Fiction

DS 45.23: Poster

Donnerstag, 3. April 2014, 16:00–19:00, P1

HREELS on the In/Si(111)-(4x1) to (8x2) phase transition — •Raphael Müller, Olaf Skibbe, Jan Pischel, and Annemarie Pucci — Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany

Interest in 1D-metallic systems on the nanoscale has increased lately due to interesting properties such as transport anisotropy, charge density waves, Luttinger liquid behavior et cetera.
One example for such systems are self-assembled Indium nanochains on vicinal Si(111) surfaces showing anisotropic collective excitations [1] and a characteristic phase transition whose nature is still under debate [2]. Whilst the In/Si(111)-system was investigated intensively by STM, ARPES and other techniques [3,4], electron energy loss spectroscopy (EELS) with an energy resolution appropriate for surface phonon investigation in the various temperature ranges had not been performed in a comprehensive manner. In order to gain more insight into the reported excitations and the connected phase transition, we used an ELS-22 spectrometer with high energy resolution to probe plasmonic and phononic excitations in the In/Si(111)-nanochains. Here, we report on measurements conducted above and below the phase transition temperature of 120K with excitation parallel and perpendicular to the 1D-metallic chains.

[1] Liu et al., Phys. Rev. B 77, 205415, 2008.

[2] Wippermann and Schmidt, Phys. Rev. Lett. 105, 126102, 2010.

[3] Yeom et al., Phys. Rev. Lett. 82, 4898-4901, 1999.

[4] S. Hasegawa, J. Phys.: Condens. Matter 22, 084026, 2010.