info:eu-repo/semantics/article
Single spin resonance driven by electric modulation of the g-factor anisotropy
Fecha
2019-12Registro en:
Ferrón, Alejandro; Rodriguez, Santiago Agustín; Gomez, Sergio Santiago; Lado, Jose Luis; Fernandez Rossier, Joaquín; Single spin resonance driven by electric modulation of the g-factor anisotropy; American Physical Society; Physical Review Research; 1; 3; 12-2019; 1-15
2643-1564
CONICET Digital
CONICET
Autor
Ferrón, Alejandro
Rodriguez, Santiago Agustín
Gomez, Sergio Santiago
Lado, Jose Luis
Fernandez Rossier, Joaquín
Resumen
We address the problem of electronic and nuclear spin resonance of an individual atom on a surface driven by a scanning tunneling microscope. Several mechanisms have been proposed so far, some of them based on the modulation of exchange and crystal field associated with a piezoelectric displacement of the adatom driven by the radio frequency (RF) tip electric field. Here we consider another mechanism, where the piezoelectric displacement modulates the g -factor anisotropy, leading both to electronic and nuclear spin flip transitions. We discuss thoroughly the cases of hydrogenated Ti ( S = 1 / 2 ) and Fe ( S = 2 ) on MgO, relevant for recent experiments. We model the system using two approaches. First, an analytical model that includes crystal field, spin orbit coupling, and hyperfine interactions. Second, we carry out density-functional-based calculations. We find that the modulation of the anisotropy of the g tensor due to the piezoelectric displacement of the atom is an additional mechanism for scanning tunneling microscopy (STM)-based single spin resonance that would be effective in S = 1 / 2 adatoms with large spin orbit coupling. In the case of hydrogenated Ti on MgO, we predict a modulation spin resonance frequency driven by the DC electric field of the tip.