SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Gerhard Ertl Young Investigator Award Competition
O 72.1: Vortrag
Donnerstag, 30. März 2023, 10:30–11:00, CHE 89
Imaging electrons in 1D: correlated states within MoS2 mirror twin boundaries — •Wouter Jolie — II. Physikalisches Institut, Universität zu Köln, Germany
Electrons are prone to strong correlations when confined into one-dimensional (1D) cavities. An ideal experimental testbed for the observation of correlated electronic behavior is found in mirror twin boundaries (MTBs) of the two-dimensional material MoS2. These MTBs function as structurally perfect 1D cavities, are only weakly coupled to the environment and accessible to spatially resolved spectroscopic investigations using scanning tunneling microscopy.
In my talk I will show that the confined quasiparticles within finite MoS2 MTBs transform into spin and charge modes as described by the Tomonaga Luttinger theory of strongly interacting 1D electrons [1]. In addition, a Kondo resonance, delocalized over the entire length of the MTB, emerges when the highest occupied mode is half filled [2]. The unique construction of our Kondo system enables us to directly measure the energies of both the Kondo resonance and the half filled confined level, as well as their correlated beating along the boundary. Lastly, I will outline how to alter the electronic system in MTBs through giant Fermi level shifts [3] and atomic manipulation.
[1] W. Jolie et al., Phys. Rev. X 9, 011055 (2019)
[2] C. van Efferen et al., arXiv:2210.09675 (2022)
[3] C. van Efferen et al., 2D Mater. 9, 025026 (2022)