Classical and quantum correlations in coupled spin systems and their influence on the tunnelling conductance

Dr. Markus Ternes Max Planck Institute for Solid State Research, Stuttgart, Germany

In recent years inelastic spin-flip spectroscopy using a low-temperature scanning tunneling microscope has been a very successful tool for studying not only individual spins but also complex coupled systems. When these systems interact with the electrons of the supporting electrodes correlated many-particle states can emerge, making them ideal prototypical quantum systems. In this presentation I will show how the controlled coupling of individual spin systems can lead not only to an energy shift of the eigenstates reminiscent of an externally applied field, but also to a bias asymmetry in the differential conductance. Using S = 1 and S = 1/2 model systems of CoHx on a h-BN/Rh(111) substrate [1] in conjunction with model Hamiltonians [2] which takes the coupling and correlation to the environment explicitly into account
enables to precisely determine and control the emergence of correlations between the two subsystems on tip and sample [3].

[1] P. Jacobson et al., Nature Communications 6, 8536 (2015).
[2] M. Ternes, New J. Phy. 17, 063016 (2015).
[3] M. Muenks, et. al., arXiv:1605.02798 [cond-mat.mes-hall] (2016).

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