TY - JOUR
T1 - Fingerprints of single nuclear spin energy levels using STM – ENDOR
AU - Manassen, Yishay
AU - Averbukh, Michael
AU - Jbara, Moamen
AU - Siebenhofer, Bernhard
AU - Shnirman, Alexander
AU - Horovitz, Baruch
N1 - Funding Information:
This work was funded by the Marie Curie grant from the European commission. Grants from the the Israel Science Foundation (Bikura and Regular ISF programs), from the ministry of science infrastructure program and from the DFG project “Magnetism of vacancies and edge states in graphene probed by electron spin resonance and scanning tunneling spectroscopy” are gratefully acknowledged. AS acknowledges support from the DFG Research Grant SH 81/3-1.
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/4/1
Y1 - 2018/4/1
N2 - We performed STM-ENDOR experiments where the intensity of one of the hyperfine components detected in ESR-STM is recorded while an rf power is irradiated into the tunneling junction and its frequency is swept. When the latter frequency is near a nuclear transition a dip in ESR-STM signal is observed. This experiment was performed in three different systems: near surface SiC vacancies where the electron spin is coupled to a next nearest neighbor 29Si nucleus; Cu deposited on Si(111)7x7 surface, where the unpaired electron of the Cu atom is coupled to the Cu nucleus (63Cu, 65Cu) and on Tempo molecules adsorbed on Au(111), where the unpaired electron is coupled to a Nitrogen nucleus (14N). While some of the hyperfine values are unresolved in the ESR-STM data due to linewidth we find that they are accurately determined in the STM-ENDOR data including those from remote nuclei, which are not detected in the ESR-STM spectrum. Furthermore, STM-ENDOR can measure single nuclear Zeeman frequencies, distinguish between isotopes through their different nuclear magnetic moments and detect quadrupole spectra. We also develop and solve a Bloch type equation for the coupled electron-nuclear system that facilitates interpretation of the data. The improved spectral resolution of STM - ENDOR opens many possibilities for nanometric scale chemical analysis.
AB - We performed STM-ENDOR experiments where the intensity of one of the hyperfine components detected in ESR-STM is recorded while an rf power is irradiated into the tunneling junction and its frequency is swept. When the latter frequency is near a nuclear transition a dip in ESR-STM signal is observed. This experiment was performed in three different systems: near surface SiC vacancies where the electron spin is coupled to a next nearest neighbor 29Si nucleus; Cu deposited on Si(111)7x7 surface, where the unpaired electron of the Cu atom is coupled to the Cu nucleus (63Cu, 65Cu) and on Tempo molecules adsorbed on Au(111), where the unpaired electron is coupled to a Nitrogen nucleus (14N). While some of the hyperfine values are unresolved in the ESR-STM data due to linewidth we find that they are accurately determined in the STM-ENDOR data including those from remote nuclei, which are not detected in the ESR-STM spectrum. Furthermore, STM-ENDOR can measure single nuclear Zeeman frequencies, distinguish between isotopes through their different nuclear magnetic moments and detect quadrupole spectra. We also develop and solve a Bloch type equation for the coupled electron-nuclear system that facilitates interpretation of the data. The improved spectral resolution of STM - ENDOR opens many possibilities for nanometric scale chemical analysis.
KW - ENDOR
KW - ESR
KW - STM
UR - http://www.scopus.com/inward/record.url?scp=85042389205&partnerID=8YFLogxK
U2 - 10.1016/j.jmr.2018.02.005
DO - 10.1016/j.jmr.2018.02.005
M3 - Article
AN - SCOPUS:85042389205
SN - 1090-7807
VL - 289
SP - 107
EP - 112
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
ER -