Denner M Michael, Thomale Ronny, Neupert Titus
Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
Institute for Theoretical Physics, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Phys Rev Lett. 2021 Nov 19;127(21):217601. doi: 10.1103/PhysRevLett.127.217601.
Motivated by the recent discovery of unconventional charge order, we develop a theory of electronically mediated charge density wave formation in the family of kagome metals AV_{3}Sb_{5} (A=K,Rb,Cs). The intertwining of van Hove filling and sublattice interference suggests a three-fold charge density wave instability at T_{CDW}. From there, the charge order forming below T_{CDW} can unfold into a variety of phases capable of exhibiting orbital currents and nematicity. We develop a Ginzburg Landau formalism to stake out the parameter space of kagome charge order. We find a nematic chiral charge order to be energetically preferred, which shows tentative agreement with experimental evidence.
受近期非常规电荷序发现的启发，我们发展了一种关于戈薇金属AV₃Sb₅（A = K、Rb、Cs）族中电子介导的电荷密度波形成的理论。范霍夫填充与亚晶格干涉的交织表明在Tₚₚₚ处存在三重电荷密度波不稳定性。从那里开始，在Tₚₚₚ以下形成的电荷序可以展开成各种能够表现出轨道电流和向列性的相。我们发展了一种金兹堡 - 朗道形式体系来确定戈薇电荷序的参数空间。我们发现一种向列手性电荷序在能量上更受青睐，这与实验证据初步吻合。
