Antiferromagnetic chiral spin density wave and strain-induced Chern insulator in the square lattice Hubbard model with frustration
文献类型：期刊论文
| 作者 | Huang, Yun-Peng; Dong, Jin-Wei; Kotetes, Panagiotis; Zhou, Sen2,3
|
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2020 |
| 卷号 | 102期号:19页码:195120 |
| 关键词 | QUANTIZED HALL CONDUCTANCE BERRY PHASE TRIPLE-Q NEUTRON STATES FIELD |
| ISSN号 | 2469-9950 |
| DOI | 10.1103/PhysRevB.102.195120 |
| 英文摘要 | We employ the Hartree-Fock approximation to identify the magnetic ground state of the Hubbard model on a frustrated square lattice. We investigate the phase diagram as a function of the Coulomb repulsion's strength U, and the ratio t'/t between the nearest- and next-nearest-neighbor hoppings t and t'. At half-filling and for a sufficiently large U, an antiferromagnetic chiral spin density wave order with nonzero spin chirality emerges as the ground state in a wide regime of the phase diagram near t'/t = 1/root 2, where the Fermi surface is well nested for both (pi, pi) and (pi, 0)/(0, pi) wave vectors. This triple-Q chiral phase is sandwiched by a single-Q Neel phase and a double-Q coplanar spin-vortex crystal phase, at smaller and larger t'/t, respectively. The energy spectrum in the chiral spin density wave phase consists of four pairs of degenerate bands. These give rise to two pairs of Dirac cones with the same chirality at the point (pi/2, pi/2) of the Brillouin zone. We demonstrate that the application of a diagonal strain induces a d(xy)-wave next-nearest-neighbor hopping which, in turn, opens gaps in the two Dirac cones with opposite masses. As a result, four pairs of well-separated topologically nontrivial bands emerge, and each pair of those contributes with a Chern number +/- 1. At half-filling, this leads to a zero total Chern number and renders the topologically nontrivial properties observable only in the ac response regime. Instead, we show that at 3/4 filling, the triple-Q chiral phase yields a Chern insulator exhibiting the quantum anomalous Hall effect. |
| 学科主题 | Materials Science ; Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/27157]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Yun-Peng,Dong, Jin-Wei,Kotetes, Panagiotis,et al. Antiferromagnetic chiral spin density wave and strain-induced Chern insulator in the square lattice Hubbard model with frustration[J]. PHYSICAL REVIEW B,2020,102(19):195120. |
| APA | Huang, Yun-Peng,Dong, Jin-Wei,Kotetes, Panagiotis,&Zhou, Sen.(2020).Antiferromagnetic chiral spin density wave and strain-induced Chern insulator in the square lattice Hubbard model with frustration.PHYSICAL REVIEW B,102(19),195120. |
| MLA | Huang, Yun-Peng,et al."Antiferromagnetic chiral spin density wave and strain-induced Chern insulator in the square lattice Hubbard model with frustration".PHYSICAL REVIEW B 102.19(2020):195120. |
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来源：理论物理研究所
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