« All Events
Long Liang – Weyl semimetals in torsional spacetime
2020-02-10 @ 16:00 - 16:30
- Title: Weyl semimetals in torsional spacetime
- Abstract: 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].
- References:
[1] Long Liang and Teemu Ojanen, Phys. Rev. Research 1, 032006(R)(2019).
[2] Long Liang and Teemu Ojanen, arXiv: 1912.07732.
[3] J. Nissinen and G.E. Volovik, arXiv: 1909.08936; Ze-Min Huang, Bo Han, and Michael Stone, arXiv: 1911.00174.
[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).
