Article
Multidisciplinary Sciences
Minkyung Kim, Zihao Wang, Yihao Yang, Hau Tian Teo, Junsuk Rho, Baile Zhang
Summary: Researchers have designed and demonstrated a 3D photonic topological insulator (PTI) that exhibits self-guided topological surface states without the need for additional confinement. By removing spin-orbit coupling, this PTI opens new possibilities for manipulating photons at the outer surface of photonic bandgap materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xiaoming Zhang, Jiale Liu, Feng Liu
Summary: This study generalizes the effective p-wave theory to antisymmetric SOC (ASOC) and demonstrates that various 2D crystals can facilitate the desired ASOC. 314 TSC candidate materials are discovered by screening 2D material databases.
Article
Physics, Applied
Nguyen Huynh Duy Khang, Takanori Shirokura, Tuo Fan, Mao Takahashi, Naoki Nakatani, Daisuke Kato, Yasuyoshi Miyamoto, Pham Nam Hai
Summary: Topological insulators (TIs) are potential materials for spin-orbit torque (SOT) switching due to their large spin Hall angle. This study investigated SOT magnetization switching in both thermal activation and fast switching regimes using BiSb topological insulator. The results show differences in zero-Kelvin threshold switching current density for the two regimes, and suggest the potential of BiSb thin film for ultra-low power and fast operation of SOT-based spintronic devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Martin Claassen, Lede Xian, Dante M. Kennes, Angel Rubio
Summary: The study predicts that twisted bilayers of ZrS2 with the group-IV metal Zr can form an emergent moire Kagome lattice with strong spin-orbit coupling, leading to novel topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS2 heterostructures give rise to an emergent and twist-controlled moire Kagome lattice, combining geometric frustration and strong spin-orbit coupling to realize a moire quantum spin Hall insulator with highly controllable and nearly-dispersionless bands.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Niraj Kumar Singh, Divya Rawat, Dibyendu Dey, Anna Elsukova, Per O. A. Persson, Per Eklund, A. Taraphder, Ajay Soni
Summary: In this study, we investigate the structure, vibrational properties, and weak anti-localization-induced quantum correction to magnetoconductivity in single-crystal Bi2GeTe4. Our results reveal the presence of a single Dirac cone corresponding to topological surface states in Bi2GeTe4, and demonstrate the interaction between electrons of the topological state and phonons involving the vibrations of Bi-Te.
Article
Chemistry, Physical
Hongwei Xue, Wenxing Lv, Di Wu, Jialin Cai, Zhihao Ji, Yu Zhang, Zhongming Zeng, Qingyuan Jin, Zongzhi Zhang
Summary: This study investigates the temperature-dependent spin-orbit torque efficiencies in topological insulators, showing a significant enhancement at lower temperatures due to improved spin-polarized surface states. The findings provide insights into spin transport mechanisms and robust charge-spin conversion in TIs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Jon G. C. Kragskow, Andrea Mattioni, Jakob K. Staab, Daniel Reta, Jonathan M. Skelton, Nicholas F. Chilton
Summary: Electron-phonon coupling plays a crucial role in various physical phenomena, such as photosynthesis, catalysis, and quantum information processing. One area of significant interest is the study of single-molecule magnets for the miniaturization of binary data storage media. Progress in synthetic organometallic chemistry has led to the observation of molecular magnetic memory effects at higher temperatures. However, understanding the interplay between phonons and molecular spin states is still a challenge. This Tutorial Review aims to introduce the topics of phonons, molecular spin-phonon coupling, and magnetic relaxation, and to outline relevant theories using traditional perturbative approaches and modern open quantum systems methods.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Jeongheon Choe, David Lujan, Martin Rodriguez-Vega, Zhipeng Ye, Aritz Leonardo, Jiamin Quan, T. Nathan Nunley, Liang-Juan Chang, Shang-Fan Lee, Jiaqiang Yan, Gregory A. Fiete, Rui He, Xiaoqin Li
Summary: Through investigating the phonon spectra of MnBi2Te4, we found the effects of couplings between electron, spin, and lattice on the material properties, and observed an increase in electron-phonon coupling with decreasing sample thickness.
Article
Chemistry, Physical
Qing Lin He, Taylor L. Hughes, N. Peter Armitage, Yoshinori Tokura, Kang L. Wang
Summary: This Perspective discusses the interplay between magnetism and topology in condensed matter. Topological electronic materials, such as topological insulators, have unique electronic band structures that lead to stable and unconventional topological states, potentially revolutionizing developments in electronics. This Perspective summarizes the advancements of topological insulators in various electronic applications, including spintronics and magnetoelectronics, and analyzes several important phenomena related to topological insulators.
Article
Materials Science, Ceramics
Poorva Sharma, Jiyu Fan, Ashwini Kumar, Binoy Krishna De, Zhaoming Tian, Lei Zhang, Hui Han, Wei Liu, Chunlan Ma, V. G. Sathe, Hao Yang
Summary: In this study, the spin-orbital coupling, spin-phonon coupling, and Kitaev magnetism in antiferromagnetic La2ZnIrO6 single crystal were investigated through magnetometer and Raman scattering spectroscopy measurements. Strong spin-phonon coupling and Kitaev interaction were found to be present in La2ZnIrO6.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Condensed Matter
MdIstiaque Rahaman, Mahbub Alam
Summary: 2D hexagonal lattice Topological Insulator (TI) exhibits topologically protected spin polarized edge transport, with suppressed electron backscattering making the edge transport robust against perturbations. Elastic phonon dephasing serves as a generalized scattering and dephasing mechanism, and this study using NEGF formalism illustrates its effect on electron transport in 2D hexagonal lattice TI. The results suggest the potential of using TI in future dissipationless coherent nanoelectronic devices.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Physics, Applied
Tuo Fan, Nguyen Huynh Duy Khang, Takanori Shirokura, Ho Hoang Huy, Pham Nam Hai
Summary: The study demonstrates that sputtered BiSb topological insulators in Pt/Co/Pt-MgO heterostructures have high effective spin Hall angle and electrical conductivity, allowing for magnetization switching at low current densities. This highlights the high efficiency and robustness of BiSb as a spin current source in realistic SOT-MRAM applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Haoran Lu, Run Long, Wei-Hai Fang
Summary: This study investigates the charge and spin relaxation dynamics in topological insulator Bi2Te3 by performing molecular dynamics simulations. The research finds that the charge relaxation in the bulk path is dominated by electron-phonon coupling and positively correlated with temperature, while the charge relaxation in the surface path is influenced by spin-phonon coupling and exhibits an opposite temperature dependence.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Applied
H. Y. Poh, C. C. I. Ang, G. J. Lim, T. L. Jin, S. H. Lee, E. K. Koh, F. Poh, W. S. Lew
Summary: This study demonstrates the preservation of the topological surface state and enhancement of spin-orbit-torque efficiency at the Co/Bi-Sb(012) interface through the use of various nonmagnetic insertion layer materials. The crystallinity control of Bi-Sb(012) is found to play a crucial role in determining the spin-orbit-torque efficiency. These findings pave the way for the utilization of topological insulators as low-energy spin source materials in spintronics applications.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Sanjeev, Mukhtiyar Singh, Ramesh Kumar, Sunita Srivastava, Tankeshwar Kumar
Summary: Topological insulators NaCaBi and KBaBi exhibit topologically protected dissipationless surface states, forming a nodal loop and showing band inversion with strong spin-orbit coupling. The presence of spin-orbit coupling induces a band gap and the compounds are classified as strong topological insulators with Z2 indices of (1; 000). Additionally, the calculated topological surface states reveal a single Dirac cone at the Gamma-point below the Fermi level.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
