Description

The quantum properties of atoms 1-dimensional (1D) spin chains are nowadays routinely tested using scanning tunneling microscopes2. Separately, intense research is focusing on how a quantum system can couple with the quantized levels of optical cavities3. To merge the physics of these research tracks onto an applicative path, our team has been studying the quantum properties of antiferromagnetic spin ½ 1D chains borne by molecules, when inserted into vertical spintronic nanopillar junctions4–6. Several published results, and preliminary measurements, depict how the quantum properties of the quantum entangled spin chain are profoundly altered due to fully spin-polarized charge transfer from the junction’s metallic interfaces, and the resulting spintronic cavity confinement. A number of spintronic mechanisms have been invoked to explain the very strong on-site spin splitting ~5-100T of the potential qubit, and cyclical (i.e. engine), autonomous on-chip behavior of transport across such junctions. Compared to other quantum platforms, this device class can advantageously operate at/beyond room temperature, and given the industrial underpinnings of spintronics7, is thus a promising new vector for quantum technologies.

 

However, so far, several of these mechanisms, such as the fuel from measurements of quantum information8, are intertwined, thereby requiring fundamental research9.To improve our understanding of these effects, we propose as the starting idea of a PhD project to control the solidstate property that dominantly alters the spin chain’s quantum property: the ferromagnetic state of the electronically proximate metallic electrode. We will use alloying to tune its Curie temperature, and perform temperature-dependent magnetotransport measurements to test several spintronic scenario when pitting this FM energy parameter against relevant quantum parameters (spin splitting , magnetic exchange energy J) of the spin chain.