Klein 通量在变形蜂窝-骰子晶格中的表现：从无质量到有质量粒子
Klein tunneling in deformed honeycomb-dice lattice: from massless to massive particles
AI总结：
研究了变形蜂窝-骰子晶格中粒子通量特性，发现无质量到有质量粒子的转变导致超克莱因通量到反超克莱因通量的转变。
摘要：
我们展示，在对三带α-T₃晶格施加压缩单轴变形时，狄拉克锥向彼此移动，合并，并打开间隙，而平坦带保持不变。因此，低能谱从线性到二次色散过渡，表明从无质量到有质量狄拉克粒子的转变。在此，我们理论上研究了粒子通过变形α-T₃晶格中的尖锐np结的通量性质，重点研究粒子能量为结高度一半的情况。我们展示，从无质量到有质量粒子的转变导致了在骰子晶格(α=1)中从 omnidirectional 总传输，即超克莱因通量，到 omnidirectional 总反射，即反超克莱因通量的转变。对于所有α值，这种转变表现为从传统克莱因通量到反克莱因通量的转变。
英文摘要：
We show that under compressive uniaxial deformation of the three-band $α-T_3$ lattice, the Dirac cones move toward each other, merge, and a gap opens, while the flat band remains unchanged. Consequently, the low-energy spectrum transitions from linear to quadratic dispersion, indicating the shift from massless to massive Dirac particles. Here, we theoretically investigate the tunneling properties of particles through a sharp $np$ junction in a deformed $α-T_3$ lattice, focusing on the case where the particle energy is half the junction height. We show that this transition from massless to massive particles leads to a change from omnidirectional total transmission, known as super-Klein tunneling, to omnidirectional total reflection, referred to as anti-super-Klein tunneling, in the case of the dice lattice ($α=1$). For all values of $α$, this transition manifests as a change from conventional Klein tunneling to anti-Klein tunneling.
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