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Identification of nickel-vacancy defects by combining experimental and ab initio simulated photocurrent spectra

E. Londero, E. Bourgeois, M. Nesladek, and A. Gali
Phys. Rev. B 97, 241202(R) – Published 12 June 2018
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Abstract

There is a continuous search for solid state spin qubits operating at room temperature with excitation in the infrared communication bandwidth. Recently, we have introduced the photoelectric detection of magnetic resonance (PDMR) to read the electron spin state of nitrogen-vacancy (NV) centers in diamond, a technique which is promising for applications in quantum information technology. By measuring the photoionization spectra on a diamond crystal, we found two ionization thresholds of unknown origin. On the same sample we also observed absorption and photoluminescence signatures that were identified in the literature as Ni-associated defects. We performed ab initio calculations of the photoionization cross section of the nickel split-vacancy complex (NiV) and N-related defects in their relevant charge states and fitted the concentration of these defects to the measured photocurrent spectrum, which led to a surprising match between experimental and calculated spectra. This study enabled us to identify the two unknown ionization thresholds with the two acceptor levels of NiV. Because the excitation of NiV is in the infrared, the photocurrent detected from the paramagnetic NiV color centers is a promising way towards the design of electrically readout qubits.

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  • Received 10 October 2017

DOI:https://doi.org/10.1103/PhysRevB.97.241202

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

E. Londero1, E. Bourgeois2,3, M. Nesladek2,3, and A. Gali1,4

  • 1Wigner Research Center for Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
  • 2IMOMEC Division, IMEC, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
  • 3Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
  • 4Department of Atomic Physics, Budapest University of Technology and Economics, Budafokiút 8., H-1111 Budapest, Hungary

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Issue

Vol. 97, Iss. 24 — 15 June 2018

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