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ジェームズ・ドゥ・ライュル (James de Lisle)

ジェームズ・ドゥ・ライュル (James de Lisle)

大阪大学(大学院基礎工学研究科)特別研究員

受入研究者 :
A01 藤本 聡
在任期間 :
2017年 4月 1日 ~ (Topo-Q PD)

E-mail : jdelisle[at]blade.mp.es.osaka-u.ac.jp

本領域での研究

We are interested in identifying a candidate for a Weyl superconductor (WSC). A WSC is characterised by Weyl nodes, however the nodes are contained in the superconducting gap function. The standard surface measurements such as ARPES are no longer useful as the relevant systems are at very low temperatures and therefore lie outside the sensitivity range. We show that one can identify WSC in UCoGe [1, 2] due to a new phenomenon we call the chiral-magnetothermal effect (CMTE). CMTE is analogous to the chiral anomaly in other condensed matter systems. In the CMTE the electric and magnetic field of the standard chiral magnetic effect are replaced by a temperature gradient and an effective momentum dependent magnetic field that arises from a torsional field (such as that from the vortex texture of the superconducting order parameter). The effect gives rise to spin polarisation, an effect which cannot be attributed to Zeeman splitting due to the absence of a magnetic field in the bulk. Using non-equilibrium quantum field theory in the quasiclassical limit, we show that the spin polarisation that occurs due to this effect appears under the first order quantum correction to the quasiclassical propag ator Such an effect should be observable using standard Knight shift measure ments.

[1] Mineev V P Physical Review B 66 134504 (2002)
[2] Hattori T et al. Physical Review Letters 108 066403 (2012)