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X-WR-CALDESC:Events for Dirac Materials
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DTSTART:20200329T010000
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DTSTART;TZID="Europe/Stockholm":20200210T130000
DTEND;TZID="Europe/Stockholm":20200210T170000
DTSTAMP:20260714T224616
CREATED:20200209T123809Z
LAST-MODIFIED:20200209T123809Z
UID:1663-1581339600-1581354000@diracmaterials.org
SUMMARY:Andrea Amoretti - A hydrodynamical description for transport in the strange metal phase of cuprates
DESCRIPTION:  \n\nTitle: A hydrodynamical description for transport in the strange metal phase of cuprates\n Speaker: Andrea Amoretti (Genova)\n\nThe talk is on Monday 10 February 2020\, 13:15\, room 132:028 (Nordita East). \n\nAbstract: High temperature superconductors are strongly coupled systems which present a complicated phase diagram with many coexisting phases. This makes it difficult to understand the mechanism which generates their singular transport properties. Hydrodynamics\, which mostly relies on the symmetries of the system without referring to any specific microscopic mechanism\, constitutes a promising framework to analyze these materials. In this talk I will show that in the strange metal phase of the cuprates\, a whole set of transport coefficients are described by a universal hydrodynamic framework. We corroborate our theoretical prediction by measuring the DC transport properties of Bi-2201 close to optimal doping\, proving the validity of our approach. Our argument can be used as a consistency check to understand the universality class governing the behavior of high temperature cuprate superconductors\n\n  \n
URL:http://diracmaterials.org/calendar2/andrea-amoretti-a-hydrodynamical-description-for-transport-in-the-strange-metal-phase-of-cuprates/
LOCATION:NORDITA\, 11 Roslagstullsbacken\, Stockholm\, Sweden
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DTSTART;TZID="Europe/Stockholm":20200210T160000
DTEND;TZID="Europe/Stockholm":20200210T163000
DTSTAMP:20260714T224616
CREATED:20200209T123653Z
LAST-MODIFIED:20200209T123653Z
UID:1661-1581350400-1581352200@diracmaterials.org
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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