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[Fizinfo] Szeminárium - Seminar, Tue 28 Sep 2021-Csire Gábor

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  • From: Szeminárium koordinátor <szfi-seminar AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
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  • Subject: [Fizinfo] Szeminárium - Seminar, Tue 28 Sep 2021-Csire Gábor
  • Date: Thu, 23 Sep 2021 12:59:21 +0200 (CEST)
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SZFI Seminar
Csire Gábor
(Barcelona Institute of Science and Technology)
Unconventional magnetically-textured superconductivity in elemental rhenium
When a superconductor is cooled below its critical temperature Tc the phase
of the electronic wave function gets locked to a particular value. This leads
to quantum effects on the scale of everyday objects which underpin
superconducting quantum technologies. In some unconventional superconductors
this form of symmetry breaking is concomitant with additional breaking of
time-reversal symmetry (TRS) indicating that the superconducting state is
intrinsically magnetic. Such systems are expected to have important
applications in spintronics and topological quantum computing, however this
is hindered by the lack of a general theory of unconventional
superconductivity which is normally associated with strong electron
correlations or fluctuations of competing ordered phases. Recently, however,
TRS breaking has been reported in seemingly ordinary superconductors where
such exotic physics are not at play, including the chemical element rhenium.
Here we show that TRS breaking in Re is due to a form of mixed
singlet-triplet pairing that has an atomic-scale magnetic texture. Rather
than assuming an unconventional pairing interaction from the outset, we
couple a conventional pairing model with an ab initio description of the
system's magnetism and relativistic electronic structure. We find that a
triplet pairing component emerges spontaneously due to spin-orbit coupling,
without further symmetry breaking. When an additional pairing term operating
in this channel is added in order to make our theory self-consistent a phase
with broken time-reversal symmetry emerges. Through computer experiments we
identify the non-symmorphic crystal structure as the key ingredient of this
exotic new state. Our approach represents a significant departure from
previous attempts at understanding symmetry-breaking in unconventional
superconductors, yet it describes experimental data quantitatively with only
two adjustable parameters, showing that unconventional superconductivity can
be more ubiquitous than hitherto assumed.Tuesday, 28 September 2021, 10:00
Bldg.1, auditorium,
Language of the talk: English
All interested are welcome!
Róbert Juhászszfi-seminar AT

The seminar is a hybrid event. The number of participants present in the
meeting room is limited to 20. Wearing a mask is mandatory.&nbsp;

  • [Fizinfo] Szeminárium - Seminar, Tue 28 Sep 2021-Csire Gábor, Szeminárium koordinátor, 09/23/2021

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