Regensburg 2025 – scientific programme

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PRV: Preisträgervorträge

PRV VI

PRV VI: Prize Talk

Thursday, March 20, 2025, 13:15–13:45, H4

Confining strongly correlated quasiparticles in 2D semiconductors — •Wouter Jolie — II. Physikalisches Institut, Universität zu Köln, Germany — Laureate of the Gaede-Prize 2025

Electrons are prone to strong correlations when confined into one-dimensional (1D) or 0D cavities. Many exotic ground states can emerge, depending on the type of interactions at play. Examples are Peierls transitions, Tomonaga-Luttinger liquids or Anderson impurities.

An ideal experimental testbed for the observation of correlated electronic behaviour are metallic mirror twin boundaries (MTBs) in the two-dimensional semiconductor MoS₂. These MTBs have well-defined structural and electronic properties, are only weakly coupled to the environment and accessible to spatially resolved spectroscopic techniques such as scanning tunnelling microscopy.

In my talk I will show that the confined quasiparticles within finite MoS₂ MTBs transform into spin and charge excitations as described by the Tomonaga-Luttinger liquid theory of strongly interacting 1D electrons. In addition, a Kondo resonance emerges when the highest occupied state is filled by a single electron, in quantitative agreement with the Anderson impurity model. Lastly, I will outline possible ways to create and manipulate new types of correlated states in this system.

Keywords: 2D materials; strongly correlated systems; Tomonaga-Luttinger liquid; Anderson impurity; scanning tunnelling spectroscopy