Electrons in type II Weyl semimetals display one-way propagation, which supports totally reflecting behavior at an endpoint, as one has for black hole horizons viewed from the inside. Junctions of type I and type II lead to equations identical to what one has near black hole horizons, but the physical implications, we suggest, are quite different from expectations which are conventional in that context. The time-reversed, “white hole” configuration is also physically accessible.

中文翻译：

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材料连接处的黑白孔

II型Weyl半金属中的电子显示出单向传播，这种传播支持在端点处的完全反射行为，就像从内部观察到的黑洞视界一样。I型和II型交界处产生的方程与黑洞视界附近的方程相同，但我们建议，其物理含义与该环境中的常规期望有很大不同。时间反向的“白洞”配置在物理上也是可以访问的。