Article
Chemistry, Multidisciplinary
Ke Wang, WuXing Zhou, Yuan Cheng, Min Zhang, Hai Wang, Gang Zhang
Summary: The study investigated how spin affects the phononic properties of CrI3 monolayers, finding that infrared spectra can be used to identify magnetic order and explaining the mechanisms behind thermal expansion coefficients and lattice thermal conductivity being influenced by magnetic phases. This research provides insights into spin-lattice coupling and highlights the potential of spintronic monolayers as thermal switching devices for active heat flow control.
Article
Multidisciplinary Sciences
Andrea M. Leon, Ever A. Velasquez, Francisco Caro-Lopera, Jose Mejia-Lopez
Summary: This study presents a mathematical approach to obtaining moire patterns in twisted hexagonal bilayers and calculates the electronic and magnetic properties of chromium trihalide layered compounds via ab initio methodologies. The results show that rotation angles can change magnetic configurations and lead to steep modifications in dispersion bands.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Materials Science, Multidisciplinary
Adolfo O. Fumega, Jose L. Lado
Summary: Twisted chromium trihalide bilayers exhibit the emergence of multiferroic order driven by the moire pattern. The competition between stacking-dependent interlayer magnetic exchange and magnetic anisotropy generates a spin texture in the moire supercell, leading to a non-collinear magnetic state that gives rise to an electric polarization and local ferroelectric order. Among the stoichiometric trihalides, twisted CrBr3 bilayers show the strongest multiferroic order and a strong magnetoelectric coupling, allowing for the electric generation and control of magnetic skyrmions.
Article
Chemistry, Multidisciplinary
Yanan Lu, Liqin Su, Linghui Fang, Qingyuan Luo, Meiying Gong, Dan Cao, Xiaoshuang Chen, Xiaowen Shi, Haibo Shu
Summary: This study investigates the effects of domain structures and polarization textures on the electronic properties of alpha-In2Se3 ferroelectrics. By conducting first-principles calculations and a developed domain switching theory, the researchers found that external electric fields can lower the energy barrier for domain evolution. This leads to significant changes in the band gap and resistance of alpha-In2Se3, and also causes a transition in the electronic structures of multilayer alpha-In2Se3.
Article
Nanoscience & Nanotechnology
Yang Xu, Ariana Ray, Yu-Tsun Shao, Shengwei Jiang, Kihong Lee, Daniel Weber, Joshua E. Goldberger, Kenji Watanabe, Takashi Taniguchi, David A. Muller, Kin Fai Mak, Jie Shan
Summary: Research on Moire engineering in van der Waals magnetic materials has shown the potential to create new magnetic ground states, with experiments showcasing the coexistence of ferromagnetic and antiferromagnetic states in small-twist-angle CrI3 bilayers, which can be controlled by electric gating.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Marie-Christin Hessenbuettel, Thorsten Deilmann, Peter Krueger, Michael Rohlfing
Summary: Heterostructures of two-dimensional transition-metal dichalcogenides and ferromagnetic substrates show different coupling and exciton wave functions, resulting in varied responses to magnetic fields. The findings suggest g factors as a tool for investigating exciton characteristics and shedding light on the quantummechanical interplay of magnetic and optical properties.
Article
Chemistry, Multidisciplinary
Zhe Ying, Bo Chen, Chunfeng Li, Boyuan Wei, Zheng Dai, Fengyi Guo, Dengfeng Pan, Haijun Zhang, Di Wu, Xuefeng Wang, Shuai Zhang, Fucong Fei, Fengqi Song
Summary: Building a van der Waals heterostructure can ignite interface magnetic ordering of magnetic topological insulators, which helps to reveal novel quantum states and design functional devices.
Article
Chemistry, Physical
Xiaopeng Liu, Dominik Legut, Qianfan Zhang
Summary: In two-dimensional magnets, the ultrafast photoexcited method provides a low-power and high-speed way to switch magnetic states. By using time-dependent density functional theory, the photoexcitation phase transition from R- to M-stacked phase in bilayer CrI(3) is explored and found to be induced by electron-phonon interactions. This investigation has profound implications for magnetic phase engineering strategies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yaroslav O. Kvashnin, Alexander N. Rudenko, Patrik Thunstrom, Malte Rosner, Mikhail Katsnelson
Summary: In this study, the magnetic and spectral properties of monolayer chromium triiodide were investigated using first-principles methods. The presence of strong local Coulomb interactions led to the formation of local magnetic moments on chromium, and the existence of local dynamical correlations modified the electronic structure of ferromagnetically ordered CrI3. The results obtained in this study were closer to experimental results compared to conventional methods.
Article
Chemistry, Multidisciplinary
Xiangru Kong, Hongkee Yoon, Myung Joon Han, Liangbo Liang
Summary: The study reveals that the interlayer magnetism in bilayer CrI3 can be switched from antiferromagnetic to ferromagnetic (or vice versa) by reversing the stacking pattern through rotation, providing insights into its microscopic magnetic properties.
Article
Chemistry, Multidisciplinary
Dongying Fu, Jianli Xin, Yueyue He, Shichao Wu, Xinyuan Zhang, Xian-Ming Zhang, Junhua Luo
Summary: The introduction of chirality into organic-inorganic hybrid perovskites is expected to achieve excellent photoelectric and nonlinear materials related to circular dichroism. By developing the SHG-CD effect, circularly polarized light can be distinguished in OIHPs bulk single crystals, extending the detection range to the near infrared region. The anisotropy factor (g(SHG-CD)) through SHG-CD signal is as high as 0.21.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Electrochemistry
Meng-Chien Wang, Ching-Ray Chang
Summary: This article firstly reviews the GKA rules and its application in magnetic materials, and then investigates the interlayer magnetic coupling in CrI3/MoTe2/CrI3 heterostructure using first principle calculation.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Jiamin Chen, Xing Cheng, Zhixuan Cheng, Ziruo Wang, Minglai Li, Xionghui Jia, Yuqia Ran, Yanping Li, Lun Dai
Summary: This paper reports the characteristics of graphene-CrI3-graphene van der Waals heterostructure in light detection, such as negative photoconductivity (NPC), broader detection range, faster response time, and helicity and polarization sensitivity. The experiment shows that NPC is superior to PPC in fast detection of red and NIR lights as well as their helicity and polarization.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Subhadeep Bandyopadhyay, Finn Lasse Buessen, Ritwik Das, Franz G. Utermohlen, Nandini Trivedi, Arun Paramekanti, Indra Dasgupta
Summary: We derive the microscopic spin Hamiltonian for rhombohedral CrI3 using first-principles calculations, and find dominant ferromagnetic exchange interactions as well as Dzyaloshinskii-Moriya interaction and Kitaev coupling. We also study the magnetic phase transition temperature and its evolution with applied magnetic field using Monte Carlo simulations.
Article
Chemistry, Multidisciplinary
Dina Abdul Wahab, Mathias Augustin, Samuel Manas Valero, Wenjun Kuang, Sarah Jenkins, Eugenio Coronado, Irina V. Grigorieva, Ivan J. Vera-Marun, Efren Navarro-Moratalla, Richard F. L. Evans, Kostya S. Novoselov, Elton J. G. Santos
Summary: The study of 2D van der Waals material CrI3 reveals the importance of quantum effects in describing the properties of low-dimensional magnetic compounds. Biquadratic exchange interactions are crucial for quantitatively describing the magnetism of CrI3, while quantum rescaling corrections are needed to reproduce its thermal properties.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Yung-Yeh Chang, Hechang Lei, C. Petrovic, Chung-Hou Chung
Summary: The mysterious Planckian metal state, which exhibits perfect T-linear resistivity and universal scattering rate, has been observed in the normal state of various strongly correlated superconductors near a quantum critical point. However, its microscopic origin and connection to quantum criticality remain unresolved.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Rubyann Olmos, Po-Hao Chang, Prakash Mishra, Rajendra R. Zope, Tunna Baruah, Yu Liu, Cedomir Petrovic, Srinivasa R. Singamaneni
Summary: Recently, pressure-induced structural and magnetic phase transitions were studied in two quasi-2D sister compounds, CST and MST. Magnetic property measurements showed that the ferromagnetic transition temperature decreases in CST, while in MST, the ferrimagnetic transition temperature increases. Theoretical analysis revealed that exchange coupling in MST is strongly frustrated, with the first nearest neighbor interaction being the most dominant component with the strongest pressure dependence.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Weijiong Chen, Clara Neerup Breio, Freek Massee, Milan P. Allan, Cedomir Petrovic, J. C. Seamus Davis, Peter J. Hirschfeld, Brian M. Andersen, Andreas Kreisel
Summary: The authors used scanning tunneling microscopy to detect the orbital order in the superconductor CeCoIn5, which is enhanced in the superconducting state as predicted. Visualization of atomic-orbital degrees of freedom is a challenge in scanned microscopy. Sublattice-resolved superconductive QPI techniques represent a new approach for studying hidden orbital order.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Wei Wang, Jun Li, Zhixiu Liang, Lijun Wu, Pedro M. Lozano, Alexander C. Komarek, Xiaozhe Shen, Alex H. Reid, Xijie Wang, Qiang Li, Weiguo Yin, Kai Sun, Ian K. Robinson, Yimei Zhu, Mark P. M. Dean, Jing Tao
Summary: Understanding the driving mechanisms behind metal-insulator transitions (MITs) is crucial for controlling material properties. The nature of charge order and its role in the MIT of magnetite Fe3O4 have remained unclear. Recent research has found a nematic charge order in the high-temperature structure of Fe3O4, which competes with the lattice order and triggers the Verwey transition. This discovery uncovers an unconventional type of electronic nematicity and provides insights into the mechanism of transition in Fe3O4 via electron-phonon coupling.
Article
Materials Science, Multidisciplinary
Zhixiang Hu, Junze Deng, Hang Li, Michael O. Ogunbunmi, Xiao Tong, Qi Wang, David Graf, Wojciech Radoslaw Pudelko, Yu Liu, Hechang Lei, Svilen Bobev, Milan Radovic, Zhijun Wang, Cedomir Petrovic
Summary: This study reveals that SrAgBi is a type-II three-dimensional Dirac semimetal induced by spin-orbit coupling, with a tilted Dirac cone at the Fermi energy. The presence of 7% vacancy defects on the Ag atomic site does not significantly perturb the charge compensation and Fermi surface characteristics of SrAgBi, suggesting that it could be a promising material for observing robust optical and spintronic topological quantum phenomena.
NPJ QUANTUM MATERIALS
(2023)
Article
Microscopy
Lijun Wu, Myung-Geun Han, Yimei Zhu
Summary: Recent advancements in STEM have allowed the use of 4D-STEM to measure electrostatic and magnetic potential and field in materials. However, accurately measuring and separating the magnetic and electric signals as well as removing artifacts remain challenging, especially in the presence of complex non-uniform diffraction contrast.
Article
Multidisciplinary Sciences
Jaeun Eom, In Hak Lee, Jung Yun Kee, Minhyun Cho, Jeongdae Seo, Hoyoung Suh, Hyung-Jin Choi, Yumin Sim, Shuzhang Chen, Hye Jung Chang, Seung-Hyub Baek, Cedomir Petrovic, Hyejin Ryu, Chaun Jang, Young Duck Kim, Chan-Ho Yang, Maeng-Je Seong, Jin Hong Lee, Se Young Park, Jun Woo Choi
Summary: We investigate the voltage control of magnetism in a van der Waals heterostructure device consisting of the ferromagnetic Fe3-xGeTe2 and ferroelectric In2Se3. We found that gate voltages can effectively modulate the magnetic properties of Fe3-xGeTe2, reducing its coercive field regardless of the voltage polarity. Raman spectroscopy shows that the lattice constants of In2Se3 and Fe3-xGeTe2 increase with voltage for both polarities. This can be attributed to the presence of in-plane tensile strain, which is supported by density functional theory calculations. Our results demonstrate a low-power voltage-controlled van der Waals spintronic device utilizing the magnetoelectric effect in vdW ferromagnetic/ferroelectric heterostructures.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Hector Iturriaga, Luis M. Martinez, Thuc T. T. Mai, Adam J. Biacchi, Mathias Augustin, Angela Hight R. Walker, Mohamed Fathi Sanad, Sreeprasad T. Sreenivasan, Yu Liu, Elton J. G. Santos, Cedomir Petrovic, Srinivasa R. Singamaneni
Summary: Electrochemical intercalation can induce a room temperature ferromagnetic phase in quasi-2D FGT magnet, with Curie temperatures as high as 350 K. This work demonstrates the potential of molecular intercalation in realizing high-temperature vdW magnets in an inexpensive and reliable manner.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yu Liu, Zhixiang Hu, Xiao Tong, David Graf, C. Petrovic
Summary: We report a study on the single crystals of selenospinel Cu6-xFe4+xSn12Se32 (x = 0, 1, 2), which have a cubic structure with the Fd3m space group and exhibit typical semiconductor behavior. The large difference between the activation energy for electrical conductivity Ep (32.3-69.8 meV) and for thermopower ES (3.2-11.5 meV) indicates the presence of a polaronic transport mechanism between 350 and 50 K. As the temperature decreases, it evolves into variable-range hopping conduction. Furthermore, the heat capacity shows a hump around 25(5) K and deviates from the Debye T3 law at low temperatures, suggesting the observation of structural glassy features in these crystalline solids.
Article
Materials Science, Multidisciplinary
Xiao Hu, Aashish Sapkota, Zhixiang Hu, Andrei T. Savici, Alexander I. Kolesnikov, John M. Tranquada, Cedomir Petrovic, Igor A. Zaliznyak
Summary: We report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrier density Dirac semimetal with antiferromagnetic Mn layers and Dirac fermions in Sb layers. The observed broadening of spin waves suggests substantial spin-fermion coupling, with roughly twice larger spin-wave damping than a sister material YbMnBi2. The stronger interplane interaction between Mn layers in YbMnSb2 implies the same spin-fermion coupling mechanism. Our results establish the systematic understanding of spin-fermion interactions in layered magnetic Dirac materials.
Article
Materials Science, Multidisciplinary
S. Djurdjic Mijin, A. Solajic, J. Pesic, Y. Liu, C. Petrovic, M. Bockstedte, A. Bonanni, Z. V. Popovic, N. Lazarevic
Summary: The vibrational properties of ferrimagnetic Mn3Si2Te6 single crystals are studied using Raman spectroscopy and density functional theory calculations. Eighteen Raman-active modes are identified, with 14 assigned based on trigonal symmetry. Four additional peaks following A1g selection rules are attributed to overtones. The temperature evolution of the A51g mode self-energy suggests competing short-range magnetic correlations in Mn3Si2Te6 that significantly impact the spin-phonon interaction. This research provides comprehensive insight into lattice properties, explores their temperature dependence, and provides evidence for competing short-range magnetic phases in Mn3Si2Te6.
Article
Physics, Multidisciplinary
Zhixiang Hu, Jahyun Koo, Yong Hu, Qi Wang, Milinda Abeykoon, D. Graf, Yu Liu, Hechang Lei, Junzhang Ma, Ming Shi, Binghai Yan, C. Petrovic
Summary: Ternary intermetallic BaAuSb crystal exhibits both trivial and nontrivial topological Dirac states in the bulk, with the nontrivial Fermi-surface pocket at the Brillouin zone center characterized by a few hundredths of a bare electron mass and high mobility. The conducting states with unusually high Fermi velocities and small masses can be coupled with magnetic moments in materials where Ba is substituted by magnetic rare-earth atoms.
PHYSICAL REVIEW RESEARCH
(2023)
