PalmaLab

@palmalab.bsky.social

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@CAPalma.bsky.social Lab for Atomic-scale #Quantum #Nanomaterials @HUBerlin and Atomically-Precise Molecular Architecture Devices at Interfaces @UCAS #ChemicalPhysics #ChemPhys #Physics #Chemistry #SurfaceScience http://palmalab.org ex- #SciTwitter

A ultra-high vacuum lab featuring a shiny metal chamber with a photoemission electron microscope coupled to a 4 K scanning probe microscopy. The photograph also depicts a monitor which reads "FAIR Automated Surface Lab" and two panels, the lhs panel contains scanning probe spectroscopy and scanning tunneling spectroscopy HDF5 datasets being uploaded in the local lab NOMAD Oasis. The rhs panel is running a temperature measurement protocol for the sample.
The image shows a chain with 21 solid circles representing masses, connected with alternating colored lines symbolizing stiff and soft springs. The diameter of circle no. 10 is larger, and label as "3-fold mass increase". The image attempts to convey that two vibrational phases are defined to either side of the chain, when increasing the mass at a point of such mass-spring chain composed of alternating spring chains realising the 'SSH model'. To the right side, the phase is denoted topological because the corresponding Hamiltonian is classified via a nontrivial topological index. To the left side, the phase is classified with a trivial index. Only in the topological phase, is a longitudinal boundary mode found, which is exponentially localized to the right of the heavy mass, and is represented in the image by a red line indicating the amplitudes of vibrational mode. The red line shows a large amplitude to the right of to the heavy mass, then a small amplitude, then a medium amplitude, then a small amplitude and then a vanishing amplitude centered on the solid circle no. 7 to the right. Left to heavy mass on the trivial vibrational phase side of the chain, only a small amplitude centered on the solid circle no. 2 to the left, is indicated by the red line.