Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Nanostructures at surfaces:1D, 2D, networks I
O 8.5: Talk
Monday, March 9, 2026, 11:45–12:00, WILL/A317
The Tale of a Band Melting in a Low-Dimensional Nanostructure — •Lenart Dudy1,2, Julian Aulbach2, Joerg Schaefer2, Ralph Claessen2, Victor Rogalev2,3, and Piotr Chudzinski4,5 — 1Synchrotron SOLEIL, France — 2U Würzburg, Germany — 3Diamond Light Source, UK — 4Queen's U Belfast, UK — 5Polish Academy of Sciences, Poland
We explore the unusual phenomenon of ``band melting'' in the quasi-one-dimensional nanostructure Si(553)-Au. Using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STM), we observe a striking disappearance of a well-defined electronic band upon increasing temperature, while the atomic structure remains unchanged. Such dramatic temperature-driven changes are rare and typically associated with strongly correlated systems like Kondo or Mott phases.
Our findings point to electronic disorder and suppressed quantum coherence along one dimension. Supported by theoretical insights, we interpret this behavior within a phenomenological framework involving Luttinger-liquid physics and frustrated (pseudo-)spin interactions. This work sheds light on the interplay between dimensionality, correlations, and disorder in low-dimensional materials, opening new perspectives for understanding emergent electronic phases in nanostructures.
Keywords: ARPES; STM; Low-Dimensional Systems; Si(553)-Au; Electronic Correlations