ZrTe5和HfTe5中的Dirac极化子和电阻率反常
Dirac Polarons and Resistivity Anomaly in ZrTe5 and HfTe5
摘要：
过渡金属五碲化物ZrTe 5和HfTe 5的电阻率异常是在有限温度下电阻率的一个尖峰，近40年来，人们发现了更多奇异的电和热电输运行为。在这里，我们提出了一个狄拉克极化子的理论，由大量的狄拉克电子和空穴在一个包围的晶格位移或声子云在有限的温度。狄拉克极化子的化学势随着温度的升高而扫过拓扑能带结构的带隙，导致电阻率异常。狄拉克极化子近中性态的形成解释了电阻率和热电阻率的反常行为。
英文摘要：
Resistivity anomaly, a sharp peak of resistivity at finite temperatures, in the transition-metal pentatellurides ZrTe5 and HfTe5 was observed four decades ago, and more exotic and anomalous behaviors of electric and thermoelectric transport were revealed recent years. Here we present a theory of Dirac polarons, composed by massive Dirac electrons and holes in an encircling cloud of lattice displacements or phonons at finite temperatures. The chemical potential of Dirac polarons sweeps the band gap of the topological band structure by increasing the temperature, leading to the resistivity anomaly. Formation of a nearly neutral state of Dirac polarons accounts for the anomalous behaviors of the electric and thermoelectric resistivity.
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