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Open Access Publications from the University of California

Electron spin resonance spectroscopy with femtoliter detection volume

  • Author(s): Ranjan, V
  • Probst, S
  • Albanese, B
  • Schenkel, T
  • Vion, D
  • Esteve, D
  • Morton, JJL
  • Bertet, P
  • et al.

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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.

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