Electron spin resonance spectroscopy with femtoliter detection volume

V. Ranjan (1, 2) , S. Probst (1, 2) , B. Albanese (1, 2) , T. Schenkel (3) , D. Vion (1, 2) , D. Esteve (1, 2) , J.J.L. Morton (4) , P. Bertet (1, 2)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 QUANTRONICS - Quantronics Group
3 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
4 London Centre for Nanotechnology

We report electron spin resonance measurements of donors in silicon at millikelvin temperatures using a superconducting LC planar micro-resonator and a Josephson parametric amplifier. The resonator includes a nanowire inductor, defining a femtoliter detection volume. Due to strain in the substrate, the donor resonance lines are heavily broadened. Single-spin to photon coupling strengths up to ∼3 kHz are observed. The single shot sensitivity is 120 ± 24 spins/Hahn echo, corresponding to ≈ 12±3 spins /√Hz for repeated acquisition.

Domains: Physics [physics]

V. Ranjan, S. Probst, B. Albanese, T. Schenkel, D. Vion, et al.. Electron spin resonance spectroscopy with femtoliter detection volume. Applied Physics Letters, 2020, 116 (18), pp.184002. ⟨10.1063/5.0004322⟩. ⟨cea-03116402⟩