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Y. del Castillo

As seen in: Physical Review B
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Articles by Y. del Castillo

Probing spin fractionalization with electron spin resonance based on scanning tunneling microscopy

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By Y. del Castillo, Universidade do Minho, Campus de Gualtar, J. Fernández-Rossier
| Physical Review B
The emergence of effective S=1/2 spins at the edges of S=1 Haldane spin chains is one of the simplest examples of fractionalization. Whereas there is indirect evidence of this phenomenon, direct measurement of the magnetic moment of an individual edge spin remains to be done.
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Certifying entanglement of spins on surfaces using ESR-STM

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By Universidade do Minho, Campus de Gualtar, J. Fernández-Rossier, Y. del Castillo
| Physical Review B
We propose a protocol to certify the presence of entanglement in artificial on-surface atomic and molecular spin arrays using electron spin resonance carried by scanning tunnel microscopy (ESR-STM). We first generalize the theorem that relates global spin susceptibility as an entanglement witness to the case of anisotropic Zeeman interactions, relevant for surfaces. We then propose a method to measure the spin susceptibilities of surface-spin arrays combining ESR-STM with atomic manipulation.
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