Article
Materials Science, Multidisciplinary
Katharina Laubscher, Dmitry Miserev, Vardan Kaladzhyan, Daniel Loss, Jelena Klinovaja
Summary: We study the spin configurations of magnetic impurities near the edge of a two-dimensional topological superconductor through both analytical and numerical methods. We find that the spin of a single impurity tends to align along the edge due to the interaction between the impurity and the gapless Majorana edge states. Additionally, when two impurities are placed close to the edge, the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between them is mainly mediated by the Majorana edge states, resulting in a ferromagnetic alignment of the spins along the edge. This effect can be utilized for detecting the helical Majorana edge states.
Article
Multidisciplinary Sciences
Mir Vahid Hosseini, Mehdi Askari
Summary: The study demonstrates non-Hermitian indirect interaction between two magnetic impurities placed at the interface between a 3D topological insulator and a ferromagnetic metal. The transfer of charge and spin introduces non-Hermiticity, resulting in non-monotonic behavior of the range functions. The coupling between evanescent and traveling modes leads to spatial oscillations being damped or promoted depending on the decay rates and distance in different regimes.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Hosein Cheraghchi, Mohsen Yarmohammadi
Summary: The study demonstrates the impact of ferroelectric structural distortion on the interaction between two magnetic impurity moments on SnTe and related alloys, as well as the numerical analysis of various possible gap phases. By investigating the RKKY response under different configurations, complex magnetic responses are revealed, shedding light on the magnetic properties of Dirac materials with anisotropic mass terms and enhancing the understanding of TCIs applications.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Shaowen Chen, Minhao He, Ya-Hui Zhang, Valerie Hsieh, Zaiyao Fei, K. Watanabe, T. Taniguchi, David H. Cobden, Xiaodong Xu, Cory R. Dean, Matthew Yankowitz
Summary: Twisted monolayer-bilayer graphene (tMBG) systems exhibit various correlated metallic and insulating states, as well as topological magnetic states. The phase diagram of tMBG can be switched under different perpendicular electric fields, providing a tunable platform for investigating correlated and topological states.
Article
Chemistry, Physical
Yuhui Li, Yan-Fang Zhang, Jun Deng, Wen-Han Dong, Jia-Tao Sun, Jinbo Pan, Shixuan Du
Summary: This study introduces heteroanions into 2D crystals, breaking their symmetry and achieving ternary 2D materials with emerging topological, magnetic, and dielectric properties. The rational design strategy of multiple-anion engineering shows potential for superior properties in 2D monolayers for electronic and spintronic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Lebing Chen, Jae-Ho Chung, Matthew B. Stone, Alexander Kolesnikov, Barry Winn, V. Ovidiu Garlea, Douglas L. Abernathy, Bin Gao, Mathias Augustin, Elton J. G. Santos, Pengcheng Dai
Summary: Researchers conducted a study using inelastic neutron scattering to investigate spin waves and Dirac gaps in CrI3, suggesting that Kitaev interactions and electron correlation effects are unable to explain these phenomena, while next-nearest-neighbor Dzyaloshinskii-Moriya interactions may be the microscopic origin of the Dirac gap.
Article
Multidisciplinary Sciences
Peiwen Liu, Chris Eckberg, Lei Pan, Peng Zhang, Kang L. Wang, Gunter Lupke
Summary: This study observes the phenomena of photo-induced magnetization dynamics in a magnetically doped topological insulator/antiferromagnet heterostructure, achieving a significantly enhanced perpendicular magnetic anisotropy.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Atousa Ghanbari, Jacob Linder
Summary: The interaction between magnetic impurities in a spin-split s-wave superconductor depends on the distance between the impurities and the magnitude of the spin-splitting, potentially resulting in either ferromagnetic or antiferromagnetic alignment. This interaction alternates between Ising and Heisenberg terms as the dominant factor at far distances and oscillates in magnitude with changing distances between the impurities.
Article
Materials Science, Multidisciplinary
Ahmet Utku Canbolat, Haldun Sevincli, Ozgur Cakir
Summary: This study investigates the indirect magnetic exchange interaction between two magnetic moments in a two-dimensional semiconductor with quartic dispersion. The Green's functions are obtained analytically to calculate the magnetic exchange interaction at zero temperature. The results show that the singularity in the density of states for quartic dispersion enhances the amplitude of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, and a region of finite exchange interaction arises as the Fermi energy approaches the band edge.
Article
Physics, Multidisciplinary
Gal Shavit, Yuval Oreg
Summary: In this Letter, we investigate interacting systems with spontaneous discrete symmetry breaking and find that the degenerate symmetry-broken states are topologically distinct gapped phases. Edge modes emerge at the interfaces between the two topological phases. By introducing a weak disorder field related to the order parameter, we observe a thermal transition from a gapped uniform phase to a phase with disorder-induced domain structure driven by the entropy of the edge modes. We describe this transition using a phenomenological Landau functional and validate our findings with a specific microscopic model. Furthermore, we discuss the potential experimental manifestations of this phase transition and suggest graphene-based moiré heterostructures as promising materials for detecting such transitions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Takuya Takashiro, Ryota Akiyama, Ivan A. Kibirev, Andrey Matetskiy, Ryosuke Nakanishi, Shunsuke Sato, Takuro Fukasawa, Taisuke Sasaki, Haruko Toyama, Kota L. Hiwatari, Andrey Zotov, Alexander A. Saranin, Toru Hirahara, Shuji Hasegawa
Summary: In this study, a sandwich structure was fabricated to observe the skyrmion phenomenon on a ferromagnetic topological insulator. By controlling the thickness of the spacer layer, the formation of skyrmions was stabilized. Additionally, the ordered arrangement of the ferromagnetic septuple-layer topological insulator resulted in soft magnetic skyrmions.
Article
Physics, Applied
Jiawei Jiang, Xiang Liu, Rui Li, Wenbo Mi
Summary: This study proposes a stable magnetic Janus material capable of stabilizing various topological magnetic structures, and demonstrates the spontaneous formation of sub-10 nm skyrmions in the absence of magnetic fields through van der Waals heterostructure engineering. These results provide a promising pathway for generating and modulating topological spin textures in two-dimensional spintronic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Zeyu Li, Yulei Han, Zhenhua Qiao
Summary: A new method for realizing QAHE effect with tunable Chern numbers by manipulating the magnetization orientation is proposed. It is found experimentally that by controlling the components of magnetization in different directions, two distinct phases with low and high Chern numbers can be achieved.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jie Li, Ruqian Wu
Summary: In this study, a series of 2D materials based on endohedral fullerenes were designed, integrating different functions such as ferroelectricity, multiple magnetic phases, and topologically protected edge states. This provides a new strategy for synthesizing novel 2D materials using fullerenes as building blocks.
Article
Chemistry, Multidisciplinary
Zhuolin Li, Qiangwei Yin, Yi Jiang, ZhaoZhao Zhu, Yang Gao, Shouguo Wang, Jun Shen, Tongyun Zhao, Jianwang Cai, Hechang Lei, Shi-Zeng Lin, Ying Zhang, Baogen Shen
Summary: Recently, the stabilization of topological magnetic skyrmions in the spin-orbit-coupled Kagome lattice TbMn6Sn6 near room temperature has been observed using Lorentz transmission electron microscopy. The critical role of Ruderman-Kittel-Kasuya-Yosida interaction in the stabilization of skyrmion lattice is clarified through the construction of an effective spin Hamiltonian and micromagnetic simulation. These findings not only reveal the spin topological texture in TbMn6Sn6, but also provide a solid basis for studying its interplay with electronic topology.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Tinggui Chen, Baizhan Xia, Dejie Yu, Chuanxing Bi
Summary: This study proposes a gradient phononic crystal structure for enhanced acoustic sensing. By breaking the symmetry of the PC structure, topologically protected edge states are introduced, resulting in topological acoustic rainbow trapping. The robustness and enhancement properties are verified numerically and experimentally.
