Article
Chemistry, Multidisciplinary
Ziying Wang, Zishen Wang, Yuan Ping Feng, Kian Ping Loh
Summary: Chirality plays a crucial role in spontaneous symmetry breaking and has a profound impact on the topology, charge, and spin orders of materials. This study reports the observation of predominantly chiral charge density wave (CDW) phase in two-dimensional H-phase TaS2 synthesized by molecular-beam epitaxy (MBE). Scanning tunneling microscopy (STM) imaging and first-principles calculations reveal the chirality origin in the CDW phase. This work provides new insights into the physical origin of chiral charge-ordered states and sheds light on a general ordering rule in chiral CDWs.
Article
Physics, Multidisciplinary
Francesco Petocchi, Christopher W. Nicholson, Bjoern Salzmann, Diego Pasquier, Oleg Yazyev, Claude Monney, Philipp Werner
Summary: We address the problem of the ground state of 1T-TaS2 by studying the correlated electronic structure of stacked bilayers. The surface termination determines whether the uncorrelated system is band insulating or exhibits a metallic surface state. A Mott gap opens in the surface state but is smaller than the gap originating from the bilayer structure. Our results are consistent with recent experimental measurements and clarify the interplay between Mott insulating and band insulating behavior in this system.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, Luca Perfetti
Summary: This study compares the bulk and surface properties of the transition metal dichalcogenide 1T-TaS2. It is found that when heating the sample, the surface exhibits an intermediate insulating phase while the bulk remains metallic. The amplitude mode at the surface is always stiffer and shows variable coupling to the Mott-Peierls band in different phases.
Article
Materials Science, Multidisciplinary
Li Cheng, Xuanyu Long, Xiaobin Chen, Xiaolong Zou, Zheng Liu
Summary: The study shows that a flat band in 1T-TaS2 can be understood by adjusting the t(2g) basis, and the rehybridization of three orbitals by the CDW order leads to the formation of the flat band.
Article
Multidisciplinary Sciences
Huimin Zhang, Basu Dev Oli, Qiang Zou, Xu Guo, Zhengfei Wang, Lian Li
Summary: In FeSn, we observe the symemtry-breaking and tunable electronic orders in the Kagome lattice by applying a magnetic field, providing a new avenue for studying the unique quantum states in Kagome lattice.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hossain Mohammad Ikram, Ara Ferdous, Shahed Syed Mohammad Fakruddin, Zhipeng Wang, Tadahiro Komeda
Summary: We report the finding of a 1T phase island of NbSe2 on a cleaved surface and its magnetic properties. The magnetic moment placed in the superconducting state generates the Yu-Shiba-Rusinov (YSR) state with specific position and anisotropic decay behavior. The enhancement of the YSR peak is closely related to the local curvature of the film.
Article
Physics, Multidisciplinary
Wei Ruan, Yi Chen, Shujie Tang, Jinwoong Hwang, Hsin-Zon Tsai, Ryan L. Lee, Meng Wu, Hyejin Ryu, Salman Kahn, Franklin Liou, Caihong Jia, Andrew Aikawa, Choongyu Hwang, Feng Wang, Yongseong Choi, Steven G. Louie, Patrick A. Lee, Zhi-Xun Shen, Sung-Kwan Mo, Michael F. Crommie
Summary: Research has shown that some quantum spin liquids may have an effective Fermi surface of fractionalized spinon excitations. The material 1T-TaSe2 is believed to have charge density modulations caused by an unstable spinon Fermi surface. Through scanning tunnelling spectroscopy, researchers have imaged density waves consistent with the predictions of spinon density modulation in single-layer 1T-TaSe2. Additionally, spectroscopic imaging of isolated single-layer 1T-TaSe2 has revealed long-wavelength super-modulations consistent with the behavior of itinerant spinons, allowing the experimental measurement of the spinon Fermi wavevector.
Article
Multidisciplinary Sciences
Sangjun Lee, Edwin W. Huang, Thomas A. Johnson, Xuefei Guo, Ali A. Husain, Matteo Mitrano, Kannan Lu, Alexander Zakrzewski, Gilberto A. de la Pena, Yingying Peng, Hai Huang, Sang-Jun Lee, Hoyoung Jang, Jun-Sik Lee, Young Il Joe, William B. Doriese, Paul Szypryt, Daniel S. Swetz, Songxue Chi, Adam A. Aczel, Gregory J. MacDougall, Steven A. Kivelson, Eduardo Fradkin, Peter Abbamonte
Summary: The behavior of charge density waves (CDWs) in different families of copper-oxide superconductors has been studied. This research found that the CDW amplitude is temperature independent and develops well above experimentally accessible temperatures. The CDW wavevector shows a nonmonotonic temperature dependence, exhibiting different behaviors at low temperatures and near the spin ordering temperature. The study suggests a common mechanism for CDW order in all families of cuprates.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
C. J. Butler, M. Yoshida, T. Hanaguri, Y. Iwasa
Summary: Recent theoretical investigations have shown that experimental observation of quantum spin liquids is possible using scanning tunneling microscopy, with the appearance of resonances at the edge of the upper Hubbard band being shifted under external magnetic field. In this study, scanning tunneling microscopy observations were conducted on samples of the quantum spin liquid candidate 1T-TaS2, revealing a conductance peak at the upper Hubbard band edge and its magnetic field dependence, potentially providing evidence for the existence of a quantum spin liquid in 1T-TaS2. The absence of field dependence in some samples suggests the presence of material properties yet to be understood, motivating further investigation.
Article
Materials Science, Multidisciplinary
Lukas Schwarz, Rafael Haenel, Dirk Manske
Summary: This paper introduces the use of THG experiments on superconductors to study collective excitations like the Higgs mode, and additionally analyzes the phase of the THG signal for the first time, highlighting the importance of phase information in interpreting experimental results.
Article
Materials Science, Multidisciplinary
Grace P. Chen, Elena Bykova, Maxim Bykov, Eric Edmund, Zi-Yu Cao, Xiao-Jia Chen, Jesse S. Smith, Stella Chariton, Vitali B. Prakapenka, Alexander F. Goncharov
Summary: The high-pressure properties of layered transition metal dichalcogenide 2H-NbSe2 were investigated, revealing its structural stability up to 35 GPa. The lattice compressibility changes from anisotropic to isotropic with increasing pressure. The compression behavior of interatomic bonds is highly anisotropic, while the intramolecular bonds show a nonmonotonic pressure dependence with a maximum at -12 GPa.
Article
Nanoscience & Nanotechnology
Gan Liu, Tianyu Qiu, Kuanyu He, Yizhou Liu, Dongjing Lin, Zhen Ma, Zhentao Huang, Wenna Tang, Jie Xu, Kenji Watanabe, Takashi Taniguchi, Libo Gao, Jinsheng Wen, Jun-Ming Liu, Binghai Yan, Xiaoxiang Xi
Summary: In this study, electrical switching of ferro-rotational domain states in the charge-density-wave phases of nanometre-thick 1T-TaS2 crystals is demonstrated. Despite the lack of coupling between the electric field and the ferroic order due to symmetry mismatch, the electric field drives domain wall propagation, resulting in reversible, durable, and non-volatile isothermal state switching.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Shiwei Shen, Chenhaoping Wen, Pengfei Kong, Jingjing Gao, Jianguo Si, Xuan Luo, Wenjian Lu, Yuping Sun, Gang Chen, Shichao Yan
Summary: Researchers demonstrate a transition from an insulating gap to a tunable Kondo resonance in 1T-TaS2 by Pb intercalation, providing a pathway for creating and tuning many-body electronic states in layered narrow-electronic-band materials.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Junjie Zeng, Qingming Li, Xun Yang, Dong-Hui Xu, Rui Wang
Summary: Recent studies have found unexpected chiral flux phases in quasi-2D kagome superconductors AV(3)Sb(5), which are associated with the spontaneous time-reversal symmetry breaking in charge density wave states. The researchers have further investigated the unique edge state properties of these chiral flux phases and found that they are consistent with the Bogoliubov-de Gennes Chern numbers.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
I. G. Gorlova, S. A. Nikonov, S. G. Zybtsev, V. Ya. Pokrovskii, A. N. Titov
Summary: The layered quasi one-dimensional compound TiS3 exhibits remarkable optical properties, especially photoconductivity, which is influenced by the mobility of electrons. As the temperature decreases, the photoconductivity of TiS3 increases moderately, showing semiconductor behavior above approximately 100 K and a potential phase transition into a collective state below 60 K. Additionally, a drop in electron mobility is observed around 17 K.
APPLIED PHYSICS LETTERS
(2022)
