Fig. 3 | npj Quantum Materials

Fig. 3

From: Artificial gravity field, astrophysical analogues, and topological phase transitions in strained topological semimetals

Fig. 3

Astrophysical analogues in strained topological semimetal. a Schematic figure showing (up) a white-hole horizon and (bottom) a black-hole horizon at z = z h , corresponding to the Schwarzschild radius of metric (5). The arrows indicate the quasiparticle propagation directions in each region. b Effective refractive index n for quasiparticle propagation vs. strain. c,d Analogue of gravitational lensing effect. The white line indicates a quasiparticle trajectory (geodesic) in the xy-plane. δϕ indicates the deflection angle. The colormap shows the strain profile. In b–d, parameters of Na3Bi are used

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