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[Fizinfo] Szemináriumok - Seminars: Yasir Iqbal

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  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
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  • Subject: [Fizinfo] Szemináriumok - Seminars: Yasir Iqbal
  • Date: Thu, 9 Dec 2021 06:00:01 +0100 (CET)
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SZFI SeminarYasir IqbalIndian Institute of Technology Madras (host: Penc
Karlo)Quantum spin liquid physics on a novel square-kagome lattice
materialTuesday, 14 December 2021, 10:00, Bldg 1., auditorium,
Meeting ID: 954 7380 2970 Passcode: 654044The search for quantum spin
liquids is one of the most hotly pursued endeavors in condensed matter
physics. In two dimensions, corner-sharing triangular geometries such as the
kagome lattice have proved to be a fertile ground in realizing these exotic
phases of quantum matter. In this talk, I will discuss the novel
square-kagome lattice geometry as an ideal playground for realizing quantum
spin liquids, being motivated by its recent first of a kind experimental
realization in the spin S=1/2 system KCu6AlBiO4(SO4)5Cl. Towards
understanding the rich quantum phase diagram of the square-kagome lattice, we
employ state-of-the-art quantum many-body numerical techniques such as
variational Monte Carlo (VMC) with versatile Gutzwiller-projected Jastrow
wave functions, unconstrained multi-variable variational Monte Carlo (mVMC),
and pseudo-fermion/Majorana functional renormalization group (PF/PM-FRG)
methods. We establish the presence of a quantum paramagnetic ground state and
investigate its nature, by classifying symmetric and chiral quantum spin
liquids, and inspecting their instabilities towards competing
valence-bond-crystal (VBC) orders. Our VMC analysis reveals that a VBC with a
pinwheel structure emerges as the lowest-energy variational ground state, and
it is obtained as an instability of the U(1) Dirac spin liquid. Analogous
conclusions are drawn from mVMC calculations employing accurate BCS pairing
states supplemented by symmetry projectors, which confirm the presence of
pinwheel VBC order by a thorough analysis of dimer-dimer correlation
functions. Our work highlights the nontrivial role of accounting for further
neighbor Heisenberg and/or Dzyaloshinkii-Moriya interactions towards
explaining the experimental observations.&nbsp;Minden érdeklődőt szívesen
látunk! - Everyone is welcome to attend.Róbert Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Yasir Iqbal, Szeminárium koordinátor, 12/09/2021

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