12 results on '"Yanfeng GUO"'
Search Results
2. Emergence of New van Hove Singularities in the Charge Density Wave State of a Topological Kagome Metal RbV3Sb5
- Author
-
Hai-Yang Ma, Dawei Shen, Jun Li, Xiangle Lu, Jishan Liu, Yichen Yang, Jianpeng Liu, Zhicheng Jiang, Zhengtai Liu, Jinghui Wang, Yanfeng Guo, Wei Xia, Jin-Feng Jia, Zhonghao Liu, Yi Liu, Zhe Huang, and Soohyun Cho
- Subjects
Metal ,Physics ,Condensed matter physics ,visual_art ,visual_art.visual_art_medium ,General Physics and Astronomy ,Gravitational singularity ,State (functional analysis) ,Charge density wave - Published
- 2021
3. Multiband Superconductivity with Sign-Preserving Order Parameter in Kagome Superconductor CsV3Sb5
- Author
-
Shijie Fang, Yanfeng Guo, Donglai Feng, Ziyuan Chen, Han-Shu Xu, Wenqi Yang, Ruotong Yin, Yajun Yan, Wei Xia, and Yuanji Li
- Subjects
Superconductivity ,Physics ,Condensed matter physics ,General Physics and Astronomy ,Zero-point energy ,Order (ring theory) ,Charge density ,Fermi surface ,law.invention ,law ,Condensed Matter::Superconductivity ,Density of states ,Condensed Matter::Strongly Correlated Electrons ,Scanning tunneling microscope ,Anisotropy - Abstract
The superconductivity of a kagome superconductor ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ is studied by scanning tunneling microscopy and spectroscopy at ultralow temperature with high resolution. Two kinds of superconducting gaps with multiple sets of coherent peaks and residual zero-energy density of states (DOS) are observed on both half-Cs and Sb surfaces, implying multiband superconductivity. In addition, in-gap states can be induced by magnetic impurities but not by nonmagnetic impurities, suggesting a sign-preserving or $s$-wave superconducting order parameter. Moreover, the interplay between charge density waves (CDW) and superconductivity differs on various bands, resulting in different density-of-states distributions. Our results suggest that the superconducting gap is likely isotropic on the sections of Fermi surface that play little roles in CDW, and the superconducting gaps on the sections of Fermi surface with anisotropic CDW gaps are likely anisotropic as well. The residual spectral weights at zero energy are attributed to the extremely small superconducting gap on the tiny oval Fermi pockets. Our study provides critical clues for further understanding the superconductivity and its relation to CDW in ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$.
- Published
- 2021
4. Multiple Magnetic Topological Phases in Bulk van der Waals Crystal MnSb4Te7
- Author
-
Shihao Zhang, Yanfeng Guo, Dawei Shen, Xia Wang, Shuchun Huan, Zhicheng Jiang, Na Yu, Hao Su, Zhiqiang Zou, Hongyuan Wang, Xin Zhang, Yichen Yang, Zhengtai Liu, and Jianpeng Liu
- Subjects
Valence (chemistry) ,Materials science ,General Physics and Astronomy ,Weyl semimetal ,Topology ,01 natural sciences ,symbols.namesake ,Ferromagnetism ,Hall effect ,Topological insulator ,0103 physical sciences ,symbols ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,van der Waals force ,010306 general physics ,Ground state - Abstract
The magnetic van der Waals crystals MnBi_{2}Te_{4}/(Bi_{2}Te_{3})_{n} have drawn significant attention due to their rich topological properties and the tunability by external magnetic field. Although the MnBi_{2}Te_{4}/(Bi_{2}Te_{3})_{n} family have been intensively studied in the past few years, their close relatives, the MnSb_{2}Te_{4}/(Sb_{2}Te_{3})_{n} family, remain much less explored. In this work, combining magnetotransport measurements, angle-resolved photoemission spectroscopy, and first principles calculations, we find that MnSb_{4}Te_{7}, the n=1 member of the MnSb_{2}Te_{4}/(Sb_{2}Te_{3})_{n} family, is a magnetic topological system with versatile topological phases that can be manipulated by both carrier doping and magnetic field. Our calculations unveil that its A-type antiferromagnetic (AFM) ground state stays in a Z_{2} AFM topological insulator phase, which can be converted to an inversion-symmetry-protected axion insulator phase when in the ferromagnetic (FM) state. Moreover, when this system in the FM phase is slightly carrier doped on either the electron or hole side, it becomes a Weyl semimetal with multiple Weyl nodes in the highest valence bands and lowest conduction bands, which are manifested by the measured notable anomalous Hall effect. Our work thus introduces a new magnetic topological material with different topological phases that are highly tunable by carrier doping or magnetic field.
- Published
- 2021
5. Emergence of New van Hove Singularities in the Charge Density Wave State of a Topological Kagome Metal RbV_{3}Sb_{5}
- Author
-
Soohyun, Cho, Haiyang, Ma, Wei, Xia, Yichen, Yang, Zhengtai, Liu, Zhe, Huang, Zhicheng, Jiang, Xiangle, Lu, Jishan, Liu, Zhonghao, Liu, Jun, Li, Jinghui, Wang, Yi, Liu, Jinfeng, Jia, Yanfeng, Guo, Jianpeng, Liu, and Dawei, Shen
- Abstract
Quantum materials with layered kagome structures have drawn considerable attention due to their unique lattice geometry, which gives rise to flat bands together with Dirac-like dispersions. Recently, vanadium-based materials with layered kagome structures were discovered to be topological metals, which exhibit charge density wave (CDW) properties, significant anomalous Hall effect, and unusual superconductivity at low temperatures. Here, we employ angle-resolved photoemission spectroscopy to investigate the electronic structure evolution upon the CDW transition in a vanadium-based kagome material RbV_{3}Sb_{5}. The CDW phase transition gives rise to a partial energy gap opening at the boundary of the Brillouin zone and, most importantly, the emergence of new van Hove singularities associated with large density of states, which are absent in the normal phase and might be related to the superconductivity observed at lower temperatures. Our work sheds light on the microscopic mechanisms for the formation of the CDW and superconducting states in these topological kagome metals.
- Published
- 2021
6. Multiband Superconductivity with Sign-Preserving Order Parameter in Kagome Superconductor CsV_{3}Sb_{5}
- Author
-
Han-Shu, Xu, Ya-Jun, Yan, Ruotong, Yin, Wei, Xia, Shijie, Fang, Ziyuan, Chen, Yuanji, Li, Wenqi, Yang, Yanfeng, Guo, and Dong-Lai, Feng
- Abstract
The superconductivity of a kagome superconductor CsV_{3}Sb_{5} is studied by scanning tunneling microscopy and spectroscopy at ultralow temperature with high resolution. Two kinds of superconducting gaps with multiple sets of coherent peaks and residual zero-energy density of states (DOS) are observed on both half-Cs and Sb surfaces, implying multiband superconductivity. In addition, in-gap states can be induced by magnetic impurities but not by nonmagnetic impurities, suggesting a sign-preserving or s-wave superconducting order parameter. Moreover, the interplay between charge density waves (CDW) and superconductivity differs on various bands, resulting in different density-of-states distributions. Our results suggest that the superconducting gap is likely isotropic on the sections of Fermi surface that play little roles in CDW, and the superconducting gaps on the sections of Fermi surface with anisotropic CDW gaps are likely anisotropic as well. The residual spectral weights at zero energy are attributed to the extremely small superconducting gap on the tiny oval Fermi pockets. Our study provides critical clues for further understanding the superconductivity and its relation to CDW in CsV_{3}Sb_{5}.
- Published
- 2021
7. Multiple Magnetic Topological Phases in Bulk van der Waals Crystal MnSb_{4}Te_{7}
- Author
-
Shuchun, Huan, Shihao, Zhang, Zhicheng, Jiang, Hao, Su, Hongyuan, Wang, Xin, Zhang, Yichen, Yang, Zhengtai, Liu, Xia, Wang, Na, Yu, Zhiqiang, Zou, Dawei, Shen, Jianpeng, Liu, and Yanfeng, Guo
- Abstract
The magnetic van der Waals crystals MnBi_{2}Te_{4}/(Bi_{2}Te_{3})_{n} have drawn significant attention due to their rich topological properties and the tunability by external magnetic field. Although the MnBi_{2}Te_{4}/(Bi_{2}Te_{3})_{n} family have been intensively studied in the past few years, their close relatives, the MnSb_{2}Te_{4}/(Sb_{2}Te_{3})_{n} family, remain much less explored. In this work, combining magnetotransport measurements, angle-resolved photoemission spectroscopy, and first principles calculations, we find that MnSb_{4}Te_{7}, the n=1 member of the MnSb_{2}Te_{4}/(Sb_{2}Te_{3})_{n} family, is a magnetic topological system with versatile topological phases that can be manipulated by both carrier doping and magnetic field. Our calculations unveil that its A-type antiferromagnetic (AFM) ground state stays in a Z_{2} AFM topological insulator phase, which can be converted to an inversion-symmetry-protected axion insulator phase when in the ferromagnetic (FM) state. Moreover, when this system in the FM phase is slightly carrier doped on either the electron or hole side, it becomes a Weyl semimetal with multiple Weyl nodes in the highest valence bands and lowest conduction bands, which are manifested by the measured notable anomalous Hall effect. Our work thus introduces a new magnetic topological material with different topological phases that are highly tunable by carrier doping or magnetic field.
- Published
- 2021
8. Unveiling Electronic Correlation and the Ferromagnetic Superexchange Mechanism in the van der Waals Crystal CrSiTe3
- Author
-
Jiaxin Zhang, Shilei Zhang, Yulin Chen, Hongtao Yuan, Aiji Liang, Wei Xia, Chengwei Wang, Zhongkai Liu, Lexian Yang, Gang Li, Xiaochan Cai, Junwei Huang, and Yanfeng Guo
- Subjects
Physics ,Electronic correlation ,Condensed matter physics ,Magnetism ,General Physics and Astronomy ,01 natural sciences ,Crystal ,symbols.namesake ,Ferromagnetism ,Superexchange ,0103 physical sciences ,symbols ,Curie temperature ,Condensed Matter::Strongly Correlated Electrons ,van der Waals force ,010306 general physics ,Ground state - Abstract
The recent discovery of intrinsic ferromagnetic order in the atomically thin van der Waals crystal CrXTe_{3} (X=Si, Ge) stimulates intensive studies on the nature of low-dimensional magnetism because the presence of long-range magnetic order in two-dimensional systems with continuous symmetry is strictly prohibited by thermal fluctuations. By combining advanced many-body calculations with angle-resolved photoemission spectroscopy we investigate CrSiTe_{3} single crystals and unveil the pivotal role played by the strong electronic correlations at both high- and low-temperature regimes. Above the Curie temperature (T_{c}), Coulomb repulsion (U) drives the system into a charge transfer insulating phase. In contrast, below T_{c} the crystal field arranges the Cr-3d orbitals such that the ferromagnetic superexchange profits, giving rise to the bulk ferromagnetic ground state with which the electronic correlations compete. The excellent agreement between theory and experiment establishes CrSiTe_{3} as a prototype low-dimensional crystal with the cooperation and interplay of electronic correlation and ferromagnetism.
- Published
- 2019
9. Emergence of New van Hove Singularities in the Charge Density Wave State of a Topological Kagome Metal RbV3Sb5.
- Author
-
Soohyun Cho, Haiyang Ma, Wei Xia, Yichen Yang, Zhengtai Liu, Zhe Huang, Zhicheng Jiang, Xiangle Lu, Jishan Liu, Zhonghao Liu, Jun Li, Jinghui Wang, Yi Liu, Jinfeng Jia, Yanfeng Guo, Jianpeng Liu, and Dawei Shen
- Subjects
- *
CHARGE density waves , *SEMIMETALS , *DENSITY of states , *ANOMALOUS Hall effect , *PHOTOELECTRON spectroscopy , *BRILLOUIN zones - Abstract
Quantum materials with layered kagome structures have drawn considerable attention due to their unique lattice geometry, which gives rise to flat bands together with Dirac-like dispersions. Recently, vanadium-based materials with layered kagome structures were discovered to be topological metals, which exhibit charge density wave (CDW) properties, significant anomalous Hall effect, and unusual superconductivity at low temperatures. Here, we employ angle-resolved photoemission spectroscopy to investigate the electronic structure evolution upon the CDW transition in a vanadium-based kagome material RbV3Sb5. The CDW phase transition gives rise to a partial energy gap opening at the boundary of the Brillouin zone and, most importantly, the emergence of new van Hove singularities associated with large density of states, which are absent in the normal phase and might be related to the superconductivity observed at lower temperatures. Our work sheds light on the microscopic mechanisms for the formation of the CDW and superconducting states in these topological kagome metals. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
10. Multiband Superconductivity with Sign-Preserving Order Parameter in Kagome Superconductor CsV3Sb5.
- Author
-
Han-Shu Xu, Ya-Jun Yan, Ruotong Yin, Wei Xia, Shijie Fang, Ziyuan Chen, Yuanji Li, Wenqi Yang, Yanfeng Guo, and Dong-Lai Feng
- Subjects
- *
SUPERCONDUCTIVITY , *IRON-based superconductors , *SUPERCONDUCTORS , *CHARGE density waves , *SCANNING tunneling microscopy , *FERMI surfaces - Abstract
The superconductivity of a kagome superconductor CsV 3 Sb 5 is studied by scanning tunneling microscopy and spectroscopy at ultralow temperature with high resolution. Two kinds of superconducting gaps with multiple sets of coherent peaks and residual zero-energy density of states (DOS) are observed on both half-Cs and Sb surfaces, implying multiband superconductivity. In addition, in-gap states can be induced by magnetic impurities but not by nonmagnetic impurities, suggesting a sign-preserving or s -wave superconducting order parameter. Moreover, the interplay between charge density waves (CDW) and superconductivity differs on various bands, resulting in different density-of-states distributions. Our results suggest that the superconducting gap is likely isotropic on the sections of Fermi surface that play little roles in CDW, and the superconducting gaps on the sections of Fermi surface with anisotropic CDW gaps are likely anisotropic as well. The residual spectral weights at zero energy are attributed to the extremely small superconducting gap on the tiny oval Fermi pockets. Our study provides critical clues for further understanding the superconductivity and its relation to CDW in CsV 3 Sb 5. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
11. Multiple Magnetic Topological Phases in Bulk van der Waals Crystal MnSb4Te7.
- Author
-
Shuchun Huan, Shihao Zhang, Zhicheng Jiang, Hao Su, Hongyuan Wang, Xin Zhang, Yichen Yang, Zhengtai Liu, Xia Wang, Na Yu, Zhiqiang Zou, Dawei Shen, Jianpeng Liu, and Yanfeng Guo
- Subjects
- *
ANOMALOUS Hall effect , *PHOTOELECTRON spectroscopy , *CONDUCTION bands , *MAGNETIC materials , *VALENCE bands , *PHOTOEMISSION , *ANTIFERROMAGNETIC materials - Abstract
The magnetic van der Waals crystals MnBi2Te4/(Bi2Te3)n have drawn significant attention due to their rich topological properties and the tunability by external magnetic field. Although the MnBi2Te4/(Bi2Te3)n family have been intensively studied in the past few years, their close relatives, the MnSb2Te4/(Sb2Te3)n family, remain much less explored. In this work, combining magnetotransport measurements, angle-resolved photoemission spectroscopy, and first principles calculations, we find that MnSb4Te7, the n=1 member of the MnSb2Te4/(Sb2Te3)n family, is a magnetic topological system with versatile topological phases that can be manipulated by both carrier doping and magnetic field. Our calculations unveil that its A-type antiferromagnetic (AFM) ground state stays in a Z2 AFM topological insulator phase, which can be converted to an inversion-symmetry-protected axion insulator phase when in the ferromagnetic (FM) state. Moreover, when this system in the FM phase is slightly carrier doped on either the electron or hole side, it becomes a Weyl semimetal with multiple Weyl nodes in the highest valence bands and lowest conduction bands, which are manifested by the measured notable anomalous Hall effect. Our work thus introduces a new magnetic topological material with different topological phases that are highly tunable by carrier doping or magnetic field. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
12. Unveiling Electronic Correlation and the Ferromagnetic Superexchange Mechanism in the van der Waals Crystal CrSiTe3.
- Author
-
Jiaxin Zhang, Xiaochan Cai, Wei Xia, Aiji Liang, Junwei Huang, Chengwei Wang, Lexian Yang, Hongtao Yuan, Yulin Chen, Shilei Zhang, Yanfeng Guo, Zhongkai Liu, and Gang Li
- Subjects
- *
PHOTOELECTRON spectroscopy , *SINGLE crystals , *CRYSTALS , *CURIE temperature , *CHARGE transfer - Abstract
The recent discovery of intrinsic ferromagnetic order in the atomically thin van der Waals crystal CrXTe3 (X=Si, Ge) stimulates intensive studies on the nature of low-dimensional magnetism because the presence of long-range magnetic order in two-dimensional systems with continuous symmetry is strictly prohibited by thermal fluctuations. By combining advanced many-body calculations with angle-resolved photoemission spectroscopy we investigate CrSiTe3 single crystals and unveil the pivotal role played by the strong electronic correlations at both high- and low-temperature regimes. Above the Curie temperature (Tc), Coulomb repulsion (U) drives the system into a charge transfer insulating phase. In contrast, below Tc the crystal field arranges the Cr-3d orbitals such that the ferromagnetic superexchange profits, giving rise to the bulk ferromagnetic ground state with which the electronic correlations compete. The excellent agreement between theory and experiment establishes CrSiTe3 as a prototype low-dimensional crystal with the cooperation and interplay of electronic correlation and ferromagnetism. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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