Ferromagnetism in chiral multilayer two-dimensional semimetals

被引：6
作者：
Min, Hongki [1 ,2 ,3 ]
Hwang, E. H. [1 ,2 ,4 ,5 ]
Das Sarma, S. [1 ,2 ]
机构：
[1] Univ Maryland, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
[2] Univ Maryland, Joint Quantum Inst, Dept Phys, College Pk, MD 20742 USA
[3] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea
[4] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol, Suwon 16419, South Korea
[5] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea
来源：
PHYSICAL REVIEW B | 2017年 / 95卷 / 15期
关键词：
BAND-GAP; TRANSPORT; GRAPHENE;
D O I：
10.1103/PhysRevB.95.155414
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We calculate the temperature-dependent long-range magnetic coupling in the presence of dilute concentrations of random magnetic impurities in chiral multilayer two-dimensional semimetals, i. e., undoped intrinsic multilayer graphene. Assuming a carrier-mediated indirect Ruderman-Kittel-Kasuya-Yosida exchange interaction among the well-separated magnetic impurities with the itinerant carriers mediating the magnetic interaction between the impurities, we investigate the magnetic properties of intrinsic multilayer graphene using an effective chiral Hamiltonian model. We find that due to the enhanced density of states in the rhombohedral stacking sequence of graphene layers, the magnetic ordering of multilayer graphene is ferromagnetic in the continuum limit. The ferromagnetic transition temperature is calculated using a finite-temperature self-consistent field approximation and found to be within the experimentally accessible range for reasonable values of the impurity-carrier coupling.
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页数：7
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