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Synthetic spin hamiltonians with carbon nanotubes - Takis Kontos

Laboratoire Pierre Aigrain, CNRS, Ecole Normale Supérieure, Paris

LPS – S208a

Cavity quantum electrodynamics techniques have turned out to be instrumental to probe or manipulate the electronic states of nanoscale circuits. Recently, cavity QED architectures have been extended to quantum dot circuits. These circuits are appealing since other degrees of freedom than the traditional ones (e.g. those of superconducting circuits) can be investigated. In the first part of my talk, I will show how one can use carbon nanotube based quantum dots in that context. In particular, I will focus on how to engineer a coherent spin/photon coupling in a double quantum dot spin-valve and to use this interface to manipulate the electronic spin with cavity photons.
In the second part of my talk, I will show how we combine superconducting contacts with a magnetic texture proximal to a carbon nanotube. We demonstrate a large synthetic spin orbit interaction which deeply modifies the induced superconducting correlations in the carbon nanotube. We also observe a zero bias conductance peak which is the hallmark of Majorana zero modes.
I will show ultimately how we intend to use cavity photons as a probe these excitations.


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