Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Correlated Electrons: Quantum Impurities and Kondo Physics; Other Materials

TT 59.6: Vortrag

Donnerstag, 19. März 2020, 16:15–16:30, HSZ 03

Theory of scanning tunnelling spectroscopy of Co adatoms in a magnetic field: A Kondo problem of an extended impurity — •Bimla Danu1, Fakher F. Assaad1, and Frédéric Mila21Institut fur Theoretische Physik und Astrophysik, Universitat Wurzburg, Am Hubland, D-97074 Wurzburg, Germany — 2Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

The ability to build and manipulate various Kondo nano-structures has been demonstrated in many recent experiments using scanning tunneling spectroscopy (STS). For example, recent STS experiments on chains of Co adatoms have revealed a series of level crossings as a function of magnetic field. Motivated by these experimental studies, we explore the magnetic field induced Kondo effect that takes place at symmetry protected level crossings in finite Co adatom chains. In particular, we provide a quantitative theory of STS signal based on auxiliary-field quantum Monte Carlo simulations, and, show that the physics at the vicinity of level crossings is a Kondo problem of an extended Impurity.

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