Electron-Spin Resonance with Scanning Tunneling Microscopy of non-Paramagnetic Species.

by Mr. Zion Hazan

BGU

at Condensed Matter Seminar

Mon, 05 Jun 2023, 11:10
***Zoom***

Abstract

The Electron Spin Resonance-Scanning Tunneling Microscopy (ESR-STM) experimental method combine the atomic resolution capability of STM with the spectral resolution of ESR. Except that, instead of 107 spins required for detected signal in macroscopic ESR experiment, in ESR-STM we can extract the same (and sometimes more detailed) results from single spin localized underneath the STM tip.
ESR-STM experiments has presented measurement of the right Larmor frequency of single electrons localized in SiO2 defects, BDPA radical and atoms such as Fe. Moreover, hyperfine coupling with 14N in TEMPO radical and of Ti isotopes also were reported.
However, species without an unpaired electron are yet to be measure. Here we will report the ability to ionize the molecule or atom with the STM bias voltage and thus to study the radical ion magnetic properties.
The first demonstration of ESR-STM on the non -paramagnetic molecules: C60 and L- Glutamic acid (Glu), will be presented. Moreover, the ability to ionize an atom or a molecule for a short time can lead to a change in the intensity of the hyperfine peaks – at frequency of the nuclear Larmor frequency.
Thus, we extend those findings to study the NMR-STM spectrum of different molecules.
References
[1] Hazan, Z., Averbukh, M., & Manassen, Y. (2023). ESR-STM on Diamagnetic Molecule: C60 on graphene. Journal of Magnetic Resonance, 107377.‏
[2] Manassen, Y., Averbukh, M., Hazan, Z., Piuzi, P. B. B., & Horovitz, B. Single spin NMR (NMR1).‏
[3] Manassen, Y., Jbara, M., Averbukh, M., Hazan, Z., Henkel, C., & Horovitz, B. (2022). Tunnel current noise spectra of spins in individual dimers of molecular radicals. Physical Review B, 105(23), 235438.‏

Created on 31-05-2023 by Meidan, Dganit (dganit)
Updaded on 04-06-2023 by Meidan, Dganit (dganit)