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[Fizinfo] Szemináriumok - Seminars: Thiering Gergő

Chronological Thread 
  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Thiering Gergő
  • Date: Thu, 14 Jan 2021 06:26:01 +0100 (CET)
  • Authentication-results: (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)"

SZFI SeminarThiering GergőWigner RCP SZFIProduct Jahn-Teller effect in
group-IV – Vacancy color centers in diamond (Publication Prize talk)Tuesday,
19 January 2021, 10:00, video conference, in diamond is of interest
due to their broad range of applicability. Various point defects embedded in
diamond are realized as a solid-state quantum bit, bioimaging agent, or
ultrasensitive electric or magnetic field sensor. The negative SiV was
demonstrated to be indistinguishable single photon source in diamond with
addressable electron spin. However, it has a short spin coherence time even
at cryogenic temperatures. Recently, it has been found that the neutral SiV
as a S=1 system has a long coherence time and is very promising for quantum
communication applications [1]. However, the electronic structure of SiV(0)
is not yet completely understood. In our work [2], we employ plane-wave
supercell calculations on SiV(0) with density functional theory methods and
beyond, then compare the results with the experimental data. Initially, the
1.31 eV ZPL was erroneously assigned to a 3A2g↔3A1u transition [3]. However,
recent uniaxial stress measurements revealed [4] that the ZPL itself is a
3A2g↔3Eu transition and there is an optically inactive 3A2u state below the
3Eu excited state by 6.7 meV. Our present model agrees well with this result
and provides a physical background for these findings. In summary, we provide
a model for SiV(0) center and predict the properties of GeV(0), SnV(0),
PbV(0) centers that might be also interesting qubit candidates if
successfully embedded in diamond [5,6].Reference[1] R. C. Brendon, et al.,
Science 361, 6397 (2018)[2] G. Thiering, A. Gali, npj Computational Materials
5(1), 18 (2019)[3] U. F. S. D'Haenens-Johansson et al., Phys. Rev. B 84,
245208 (2011)[4] B. L. Green et al., Phys. Rev. B 99, 161112(R) (2019)[5]
Ciccarino, Christopher J. et al., npj Quantum Materials 5.1 (2020): 1-6[6] Z.
Zi-Huai, Paul Stevenson, G. Thiering, ... N. P. de Leon, preprint
arXiv:2004.12544 (2020)&nbsp;Minden érdeklődőt szívesen látunk! - Everyone is
welcome to attend.Róbert Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Thiering Gergő, Szeminárium koordinátor, 01/14/2021

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