论文标题
Dirac Polarons和ZRTE5和HFTE5中的电阻率异常
Dirac Polarons and Resistivity Anomaly in ZrTe5 and HfTe5
论文作者
论文摘要
在四十年前观察到了电阻率异常，有限温度下的电阻率，有限温度下的电阻率峰值，在过渡金属五肽pentelurides Zrte5和Hfte5中观察到了更多的异国情调和异常行为。在这里，我们提出了一个狄拉克极化物的理论，该理论是由大量的狄拉克电子和在有限温度下的晶格位移或声子包围的云中组成的。 Dirac Polaron的化学潜力通过增加温度来扫除拓扑带结构的带隙，从而导致电阻率异常。狄拉克极化物的近乎中立状态的形成解释了电气和热电电阻率的异常行为。
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.
