arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2008.08260cond-mat.str-el
收藏

拓扑kagome磁体中的磁竞争

Magnetic competition in topological kagome magnets

Minh-Tien Tran, Duong-Bo Nguyen, Hong-Son Nguyen, Thanh-Mai Thi Tran

摘要:

通过将自旋轨道耦合、各向异性Hund耦合和自旋交换引入到可果美晶格中,研究了拓扑可果美磁体中的磁竞争。利用Bogoliubov变分原理,我们发现在零温度和有限温度的稳定相。在零温度和强Ising-Hund耦合制度下,通过临界面内Hund耦合的普适性质实现了从面外铁磁性(FM)到面内反铁磁性(AFM)的磁可调谐性。在三分之二填充时,从面外FM到面内AFM的相变伴随着从量子反常霍尔(QAH)到量子反常自旋霍尔(QASH)效应的拓扑转变。在磁相变附近的半填充处观察到一个大的反常霍尔电导。在有限的温度下,面外FM是稳定的,直到一个交叉温度,在该温度以上的面内AFM是稳定的,但面外FM磁化仍然是有限的。这表明这些磁相在有限的温度范围内共存。

英文摘要:

Magnetic competition in topological kagome magnets is studied by incorporating the spin-orbit coupling, the anisotropic Hund coupling and spin exchange into the kagome lattice. Using the Bogoliubov variational principle we find the stable phases at zero and finite temperatures. At zero temperature and in the strong Ising-Hund coupling regime, a magnetic tunability from the out-of-plane ferromagnetism (FM) to the in-plane antiferromagnetism (AFM) is achieved by a universal property of the critical in-plane Hund coupling. At two-thirds filling the phase transition from the out-of-plane FM to the in-plane AFM is accompanied by a topological transition from quantum anomalous Hall (QAH) to quantum anomalous spin Hall (QASH) effect. Nearby half filling a large anomalous Hall conductance is observed at the magnetic phase transition. At finite temperature the out-of-plane FM is stable until a crossing temperature, above which the in-plane AFM is stable, but the out-of-plane FM magnetization is still finite. This suggests a coexistence of these magnetic phases in a finite temperature range.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑