Antiferromagnetism and Kondo screening on a honeycomb lattice

doi:10.1088/1674-1056/24/5/057101

Abstract

Magnetic adatoms in the honeycomb lattice have received tremendous attention due to the interplay between Ruderman–Kittel–Kasuya–Yosida interaction and Kondo coupling leading to very rich physics. Here we study the competition between the antiferromagnetism and Kondo screening of local moments by the conduction electrons on the honeycomb lattice using the determinant quantum Monte Carlo method. While changing the interband hybridization V, we systematically investigate the antiferromagnetic-order state and the Kondo singlet state transition, which is characterized by the behavior of the local moment, antiferromagnetic structure factor, and the short range spin-spin correlation. The evolution of the single particle spectrum are also calculated as a function of hybridization V, we find that the system presents a small gap in the antiferromagnetic-order region and a large gap in the Kondo singlet region in the Fermi level. We also find that the localized and itinerant electrons coupling leads to the midgap states in the conduction band in the Fermi level at very small V. Moreover, the formation of antiferromagnetic order and Kondo singlet are studied as on-site interaction U or temperature T increasing, we have derived the phase diagrams at on-site interaction U (or temperature T) and hybridization V plane.

Keywords: periodic Anderson model antiferromagnetism Kondo screening

Received: 23 December 2014
Revised: 16 January 2015
Accepted manuscript online:

PACS:	71.10.-w	(Theories and models of many-electron systems)
	75.10.Hk	(Classical spin models)
	75.10.-b	(General theory and models of magnetic ordering)
	71.10.Fd	(Lattice fermion models (Hubbard model, etc.))

Fund:

Project supported by the National Key Basic Research Special Foundation of China (Grants Nos. 2011CB921502 and 2012CB821305), the National Natural Science Foundation of China (Grants Nos. 61227902, 61378017, and 11434015), the State Key Laboratory for Quantum Optics and Quantum Optical Devices, China (Grant No. KF201403).

Corresponding Authors: Lin Heng-Fu
E-mail: hengfulin@126.com

About author: 71.10.-w; 75.10.Hk; 75.10.-b; 71.10.Fd

Cite this article:

Lin Heng-Fu (林恒福), Tao Hong-Shuai (陶红帅), Guo Wen-Xiang (郭文祥), Liu Wu-Ming (刘伍明) Antiferromagnetism and Kondo screening on a honeycomb lattice 2015 Chin. Phys. B 24 057101

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