Insulating Nature of Strongly Correlated Massless Dirac Fermions in an Organic Crystal
Insulating Nature of Strongly Correlated Massless Dirac Fermions in an Organic Crystal
复制标题
DOI：
10.1103/physrevlett.116.226401
复制
发表时间：
2016-05-31
影响因子：
8.6
通讯作者：
Kanoda, Kazushi
中科院分区：
文献类型：
--
作者：
Liu, Dong;Ishikawa, Kyohei;Kanoda, Kazushi
通过对具有电荷有序不稳定性的无质量狄拉克费米子的有机晶体的电阻率测量，揭示了无质量狄拉克费米子之间相互作用对电荷输运的影响。低温电阻率的上升与压力无关，并且在接近电荷有序的临界压力时增强，表明绝缘行为源于短程库仑相互作用。电荷有序相中明显消失的间隙与非拓扑边缘态的理论预测相一致。
Through resistivity measurements of an organic crystal hosting massless Dirac fermions with a charge-ordering instability, we reveal the effect of interactions among massless Dirac fermions on the charge transport. A low-temperature resistivity upturn appears robustly irrespective of the pressure and is enhanced while approaching the critical pressure of charge ordering, indicating that the insulating behavior originates from short-range Coulomb interactions. The observation of an apparently vanishing gap in the charge-ordered phase accords with the theoretical prediction of nontopological edge states.