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DTSTART;TZID="Europe/Stockholm":20200210T160000
DTEND;TZID="Europe/Stockholm":20200210T163000
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SUMMARY:Long Liang -  Weyl semimetals in torsional spacetime
DESCRIPTION:\nTitle: Weyl semimetals in torsional spacetime\n\n\n\n\nAbstract: Weyl semimetals necessarily break the time-reversal or/and inversion symmetry. In the presence of spatially varying time-reversal or inversion symmetry breaking fields\, we show that the Weyl fermions live in emergent torsional spacetime [1\,2]. This allows us to fabricate interface between type I and type II Weyl semimetals [1]\, which is analogous to the black hole horizon. Torsion also contributes to the chiral anomaly [3]\, and this leads to a thermal magnetotorsional effect\, which means that magnetization gradients perpendicular to the Weyl node separation give rise to temperature gradients depending only on the local positions of the Weyl nodes [2].  This effect could be observed in magnetic Weyl semimetal EuCd2As2 [4].\n\n\n\n\n\nReferences:\n[1] Long Liang and Teemu Ojanen\, Phys. Rev. Research 1\, 032006(R)(2019).\n[2] Long Liang and Teemu Ojanen\, arXiv: 1912.07732.\n[3] J. Nissinen and G.E. Volovik\, arXiv: 1909.08936; Ze-Min Huang\, Bo Han\, and Michael Stone\, arXiv: 1911.00174.\n[4] Lin-Lin Wang et al.\, Phys. Rev. B 99\, 245147 (2019); J.-Z. Ma et al.\,  Sci. Adv. 5 \, 4718 (2019); J.-R. Soh et al.\, Phys. Rev. B 100\, 201102(R) (2019).\n\n\n  \n
URL:http://diracmaterials.org/calendar2/long-liang-weyl-semimetals-in-torsional-spacetime/
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