An important progress in Type-II Weyl Semimetal has been made by School of Physics, Beijing Institute of Technology

2016年09月19日

Figure
(a) LL squeezing factor $α^{3 / 2}$ $α^{3 / 2}$ plotted versus $¯ θ, ¯ ϕ$ $\bar{θ}, \bar{ϕ}$ for $w / v_{0} = 1.5$ $w / v_{0} = 1.5$ . (b) Critical angle ${¯ θ}_{c}$ ${\bar{θ}}_{c}$ versus $w / v_{0}$ $w / v_{0}$ for different $¯ ϕ$ $\bar{ϕ}$ . (c) The DOS at the Weyl node energy versus $¯ θ$ $\bar{θ}$ for $w / v_{0} = 1.5$ $w / v_{0} = 1.5$ and $¯ ϕ = 0$ $\bar{ϕ} = 0$ .

Figure
LL dispersion along $k_{z}$ $k_{z}$ for (a) a type-II Weyl node ( $w / v_{0} = 1.5$ $w / v_{0} = 1.5$ ) and (b) a type-I Weyl node ( $w / v_{0} = 0.5$ $w / v_{0} = 0.5$ ). The magnetic field is along the $z$ $z$ direction ( $¯ θ = 0$ $\bar{θ} = 0$ ). The chiral LLs are plotted in red.

We show several distinct signatures in the magnetoresponse of type-II Weyl semimetals. The energy tilt tends to squeeze the Landau levels (LLs), and, for a type-II Weyl node, there always exists a critical angle between the B field and the tilt, at which the LL spectrum collapses, regardless of the field strength. Before the collapse, signatures also appear in the magneto-optical spectrum, including the invariable presence of intraband peaks, the absence of absorption tails, and the special anisotropic field dependence.

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量子功能材料设计与应用实验室

An important progress in Type-II Weyl Semimetal has been made by School of Physics, Beijing Institute of Technology