Author(s): Leyla Majidi and Reza Asgari
The broad tunability of the proximity exchange effect between transition-metal dichalcogenides (TMDCs) and chromium iodide (CrI3) heterostructures offers intriguing possibilities for the use of TMDCs in two-dimensional magnetoelectrics. In this work, the influence of the twist angle and the gate ele…
[Phys. Rev. B 106, 045406] Published Thu Jul 07, 2022
Author(s): Yang Luo, Shuting Peng, Samuel M. L. Teicher, Linwei Huai, Yong Hu, Yulei Han, Brenden R. Ortiz, Zuowei Liang, Zhiyuan Wei, Jianchang Shen, Zhipeng Ou, Bingqian Wang, Yu Miao, Mingyao Guo, Makoto Hashimoto, Donghui Lu, Zhenhua Qiao, Zhenyu Wang, Stephen D. Wilson, Xianhui Chen, and Junfeng He
CsV3Sb5 has attracted much recent attention as the first quasi-two-dimensional (2D) kagome superconductor. While the kagome layers are 2D in nature, increasing evidence has pointed to the importance of out-of-plane correlation in this material. However, it remains unclear whether such correlation ca…
[Phys. Rev. B 105, L241111] Published Tue Jun 21, 2022
Author(s): D. Huang, H. Nakamura, K. Küster, U. Wedig, N. B. M. Schröter, V. N. Strocov, U. Starke, and H. Takagi
One secret to the charm of two-dimensional (2D) van der Waals materials is that their interlayer coupling lies in a sweet spot: weak enough to render the individual layers electronically quasi-2D, yet strong enough to produce distinct behavior upon stacking individual layers. Here, the authors utilize soft-x-ray angle-resolved photoemission spectroscopy to extract the interlayer hopping parameters in the typical transition metal dichalcogenide 2H-NbS2. Comparison with first-principles calculations reveals the influence of atomic distances and hybrid functionals on interlayer coupling.
[Phys. Rev. B 105, 245145] Published Wed Jun 29, 2022
Author(s): Sangkha Borah, Dinesh Yadav, Maxim Trushin, and Fabian Pauly
Being used in optoelectronic devices as ultrathin conductor-insulator junctions, detailed investigations are needed about how exactly h-BN and graphene hybridize. Here we present a comprehensive ab initio study of hot carrier dynamics governed by electron-phonon scattering at the h-BN/graphene inter…
[Phys. Rev. B 105, 245419] Published Wed Jun 29, 2022
Author(s): Alexandru B. Georgescu, Andrew J. Millis, and James M. Rondinelli
We study the consequences of the approximately trigonal (D3d) point symmetry of the transition metal (M) site in two-dimensional van der Waals MX2 dihalides and MX3 trihalides. The trigonal symmetry leads to a 2-2-1 orbital splitting of the transition metal d shell, which is best represented by d or…
[Phys. Rev. B 105, 245153] Published Wed Jun 29, 2022
Author(s): R. B. Versteeg, A. Chiocchetta, F. Sekiguchi, A. Sahasrabudhe, J. Wagner, A. I. R. Aldea, K. Budzinauskas, Zhe Wang, V. Tsurkan, A. Loidl, D. I. Khomskii, S. Diehl, and P. H. M. van Loosdrecht
The authors use optical excitation as a way to alter the magnetic free energy landscape and the resulting phase diagram of the frustrated honeycomb magnet α-RuCl3. They time-track experimentally the magneto-optical response from the α-RuCl3’s zigzag-ordered ground state after photoexcitation and they reproduce the observed dynamics within a Ginzburg-Landau model. A quasistationary spin disordered state is induced above a critical photoexcitation density, suggesting a new route to reach a nontrivial spin disordered state in Kitaev-like magnets such as α-RuCl3.
[Phys. Rev. B 105, 224428] Published Thu Jun 30, 2022
Author(s): T. Yilmaz, E. Vescovo, J. T. Sadowski, and B. Sinkovic
We present detailed high-resolution angle-resolved photoemission experiments on VSe2 grown under various conditions. The surface electronic structure optimally grown samples can host high-temperature spectral kink, quasiparticle peak, and the Fermi gap. Collective observation of these electronic fea…
[Phys. Rev. B 105, 245114] Published Fri Jun 10, 2022
Author(s): J. Michl, C. C. Palekar, S. A. Tarasenko, F. Lohof, C. Gies, M. von Helversen, R. Sailus, S. Tongay, T. Taniguchi, K. Watanabe, T. Heindel, B. Rosa, M. Rödel, T. Shubina, S. Höfling, S. Reitzenstein, C. Anton-Solanas, and C. Schneider
We report the emergence of a significant degree of intrinsic circular polarization of exciton photoluminescence in a twisted MoSe2/WSe2 heterostructure upon nonresonant driving with a linearly polarized laser. The effect is not related to the polarization of the incident light. Moreover, it is prese…
[Phys. Rev. B 105, L241406] Published Mon Jun 13, 2022
Author(s): Aksel Kobiałka, Małgorzata Sternik, and Andrzej Ptok
Recently discovered magnetic topological insulators TBi2Te4 (T=Mn,Fe) crystallize into the R3¯m rhombohedral structure and exhibit the antiferromagnetic order. Here, we discuss the lattice dynamics of these compounds to confirm the stability of these systems. We show that the phonon dispersion does …
[Phys. Rev. B 105, 214304] Published Tue Jun 14, 2022
Author(s): Matteo Jugovac, Cesare Tresca, Iulia Cojocariu, Giovanni Di Santo, Wenjuan Zhao, Luca Petaccia, Paolo Moras, Gianni Profeta, and Federico Bisti
Graphene band renormalization near the van Hove singularity (VHS) has been investigated by angle-resolved photoemission spectroscopy (ARPES) on Li-doped quasifreestanding graphene on a cobalt (0001) surface. The absence of graphene band hybridization with the substrate, the doping contribution well …
[Phys. Rev. B 105, L241107] Published Thu Jun 09, 2022
Author(s): Li-Xin Zhou, Yin-Ti Ren, Yuan-Tao Chen, Xiao-Huan Lv, Chen-Dong Jin, Hu Zhang, Peng-Lai Gong, Ru-Qian Lian, Rui-Ning Wang, Jiang-Long Wang, and Xing-Qiang Shi
The van der Waals interface and interfacial reconstruction between two-dimensional (2D) transition-metal dichalcogenides (TMDCs) and metal electrodes significantly influence their device performance. During the growth of MoS2 and WS2 on metals, the participation of sulfur atoms leads to the Au(100) …
[Phys. Rev. B 105, 224105] Published Thu Jun 09, 2022
Author(s): Wen-Zheng Xu, Chun-Guang Chu, Zhen-Cun Pan, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Peng-Fei Zhu, Xing-Guo Ye, Da-Peng Yu, and Zhi-Min Liao
We report magnetotransport measurements in the NbN-magnetic topological insulator MnBi2Te4 (MBT)-NbN junction at low temperature. At 10 mK, the nonlinear current-voltage characteristic of the junction shows a tunneling behavior, indicating the existence of interfacial potential barriers within the h…
[Phys. Rev. B 105, 184515] Published Tue May 31, 2022
Author(s): Qing-Qing Zhang, Qingming Li, Xing-Tao An, and Jian-Jun Liu
We theoretically investigate the effect of Rashba field and magnetic exchange interaction on the topological properties of monolayer transition-metal dichalcogenides (TMDs) based on a tight-binding model. The tight-binding Hamiltonian incorporates magnetic exchange interaction and the Rashba field w…
[Phys. Rev. B 105, 205436] Published Tue May 31, 2022
Author(s): M. Köpf, S. H. Lee, Harish Kumar, Z. Q. Mao, and C. A. Kuntscher
Topological insulators with intrinsic magnetic ordering, potentially hosting rare quantum effects, recently attracted extensive attention. MnBi2Te4 is the first established example. The Sb-doped variant Mn(Bi1−xSbx)2Te4 shows a great variety of electronic properties depending on the Sb content x, su…
[Phys. Rev. B 105, 195125] Published Wed May 18, 2022
Author(s): Habib Rostami, Francisco Guinea, and Emmanuele Cappelluti
Hexagonal two-dimensional materials with broken inversion symmetry (as BN or transition metal dichalcogenides) are known to sustain chiral phonons with finite angular momentum, adding a further useful degree of freedom to the extraordinary entangled (electrical, optical, magnetic, and mechanical) pr…
[Phys. Rev. B 105, 195431] Published Thu May 26, 2022
Author(s): Long-Jing Yin, Ling-Hui Tong, Yue-Ying Zhou, Yang Zhang, Yuan Tian, Li Zhang, Lijie Zhang, and Zhihui Qin
Low-energy moiré flat bands in magic-angle twisted bilayer graphene (tBG) have demonstrated incredible potential to exhibit rich exotic quantum phenomena. Theoretically, the moiré flat bands of tBG are based on the extended structures, i.e., the moiré patterns with periodic boundary conditions. Howe…
[Phys. Rev. B 105, L201405] Published Thu May 19, 2022
Author(s): H. Zhang, C. Q. Xu, S. H. Lee, Z. Q. Mao, and X. Ke
The discovery of an intrinsic antiferromagnetic topological insulator (AFMTI) in MnBi2Te4 has attracted intense attention, most of which lies in its electrical properties. In this paper, we report electronic, thermal, and thermoelectric transport studies of this newly found AFMTI. The temperature an…
[Phys. Rev. B 105, 184411] Published Thu May 12, 2022
Author(s): Joseph A. Hlevyack, Yang-Hao Chan, Meng-Kai Lin, Tao He, Wei-Hsiang Peng, Ellen C. Royal, Mei-Yin Chou, and T.-C. Chiang
Coupling ordinary metals with topological Bi2Se3 can instigate the long-range migration of the spin-polarized Dirac states. Instead, for trivial metallic VSe2 films on Bi2Se3, topological and trivial Rashba-type interface states emerge, each strongly localized at the VSe2/Bi2Se3 interface. Their rap…
[Phys. Rev. B 105, 195119] Published Thu May 12, 2022
Author(s): Peng Wu, Xiangyang Peng, Chaobo Luo, Zhenqing Li, and Jianxin Zhong
By carrying out first-principles calculations, we studied the charge density waves (CDWs) in monolayer/few-layer H−NbS2. For monolayer NbS2, unstable phonon modes are found to develop at the 2/3ΓM point and its symmetric points in the whole Brillouin zone. By displacing the atoms along the unstable …
[Phys. Rev. B 105, 174105] Published Mon May 09, 2022
Author(s): S. V. Eremeev, M. M. Otrokov, A. Ernst, and E. V. Chulkov
Using density functional theory calculations we study atomic, electronic, and magnetic structures and their influence on the topological phase of Mn2Bi2Te5 and Mn2Sb2Te5 van der Waals compounds. Our results show that the antiferromagnetic topological insulator (AFM TI) phase in Mn2Bi2Te5 is robust b…
[Phys. Rev. B 105, 195105] Published Thu May 05, 2022
Author(s): Z. H. Tin, T. Adachi, A. Takemori, K. Yoshino, N. Katayama, S. Miyasaka, S. Ideta, K. Tanaka, and S. Tajima
We studied the band structure of NdFeAs1−xPxO0.9F0.1 (x=0, 0.2, 0.4, and 0.6) using angle-resolved photoemission spectroscopy (ARPES) measurements. Two of the hole bands, α1 (dxz) and α3 (dz2), were observed at the Brillouin zone center in the P-polarized light configuration, while the other two hol…
[Phys. Rev. B 105, 205106] Published Fri May 06, 2022
Author(s): Akash Singh, Manoj Dey, and Abhishek Kumar Singh
Transition metal dichalcogenide (TMD) shows layer-dependent electrical conductivity. However, there are conflicting experimental reports on the trend of conductivity, which is attributed to originating from point defects as a function of the number of layers (NLs). Using density functional theory, w…
[Phys. Rev. B 105, 165430] Published Tue Apr 26, 2022
Author(s): S. Sakamoto, N. Gauthier, P. S. Kirchmann, J. A. Sobota, and Z.-X. Shen
We report time- and angle-resolved photoemission spectroscopy (trARPES) measurements on the Sb(111) surface. We observe band- and momentum-dependent binding-energy oscillations in the bulk and surface bands driven by A1g and Eg coherent phonons. While the bulk band shows simultaneous A1g and Eg osci…
[Phys. Rev. B 105, L161107] Published Wed Apr 27, 2022
Author(s): P. Chen, Y.-H. Chan, R.-Y. Liu, H. T. Zhang, Q. Gao, A.-V. Fedorov, M. Y. Chou, and T.-C. Chiang
Collective phenomena in solids can be sensitive to the dimensionality of the system; a case of special interest is VSe2, which shows a (7×3) charge density wave (CDW) in the single layer with threefold symmetry in the normal phase spontaneously broken, in contrast to the (4×4) in-plane CDW in the bu…
[Phys. Rev. B 105, L161404] Published Fri Apr 29, 2022
Author(s): R. P. Day, M. X. Na, M. Zingl, B. Zwartsenberg, M. Michiardi, G. Levy, M. Schneider, D. Wong, P. Dosanjh, T. M. Pedersen, S. Gorovikov, S. Chi, R. Liang, W. N. Hardy, D. A. Bonn, S. Zhdanovich, I. S. Elfimov, and A. Damascelli
Despite its ubiquity in the characterization of the electronic structure of solids, the interpretation of angle-resolved photoemission spectroscopy measurements is by no means a trivial exercise. Here, the authors implement a combined experimental and computational methodology to exemplify this problem and its solutions in application to the canonical Fe-based superconductor LiFeAs. This work acts to reconcile many years of conflicting experimental studies, while also presenting a viable route forwards in the rapidly growing field of topological superconductivity.
[Phys. Rev. B 105, 155142] Published Thu Apr 21, 2022
Author(s): Niclas Götting, Frederik Lohof, and Christopher Gies
In bilayers of semiconducting transition metal dichalcogenides, the twist angle between layers can be used to introduce a highly regular periodic potential modulation on a length scale that is large compared to the unit cell. In such structures, correlated states can emerge, in which excitons in the…
[Phys. Rev. B 105, 165419] Published Mon Apr 18, 2022
Author(s): Xiao Lei, Liang Zhou, Zhanyang Hao, Hongtao Liu, Shuo Yang, Haipeng Sun, Xiaozhou Ma, Chen Ma, Le Wang, Hai-Zhou Lu, Jia-Wei Mei, Jiannong Wang, and Hongtao He
Shubnikov–de Hass oscillations are directly observed in undoped antiferromagnetic topological insulator MnBi2Te4. With increasing magnetic fields, the oscillation period decreases gradually in the magnetic transition from canted antiferromagnetism to ferromagnetism and then saturates in high magneti…
[Phys. Rev. B 105, 155402] Published Mon Apr 04, 2022
Author(s): Petar Popčević, Yuki Utsumi, Izabela Biało, Wojciech Tabis, Mateusz A. Gala, Marcin Rosmus, Jacek J. Kolodziej, Natalia Tomaszewska, Mariusz Garb, Helmuth Berger, Ivo Batistić, Neven Barišić, László Forró, and Eduard Tutiš
Co1/3NbS2 is the magnetic intercalate of 2H-NbS2 where electronic itinerant and magnetic properties strongly influence each other throughout the phase diagram. Here we report the angle-resolved photoelectron spectroscopy (ARPES) study in Co1/3NbS2. In agreement with previous reports, the observed el…
[Phys. Rev. B 105, 155114] Published Thu Apr 07, 2022