1
|
Li Y, Xu L, Liu G, Fang Y, Zheng H, Dai S, Li E, Zhu G, Zhang S, Liang S, Yang L, Huang F, Xi X, Liu Z, Xu N, Chen Y. Evidence of strong and mode-selective electron-phonon coupling in the topological superconductor candidate 2M-WS 2. Nat Commun 2024; 15:6235. [PMID: 39043689 PMCID: PMC11266404 DOI: 10.1038/s41467-024-50590-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 07/12/2024] [Indexed: 07/25/2024] Open
Abstract
The interaction between lattice vibrations and electrons plays a key role in various aspects of condensed matter physics - including electron hydrodynamics, strange metal behavior, and high-temperature superconductivity. In this study, we present systematic investigations using Raman scattering and angle-resolved photoemission spectroscopy (ARPES) to examine the phononic and electronic subsystems of the topological superconductor candidate 2M-WS2. Raman scattering exhibits an anomalous nonmonotonic temperature dependence of phonon linewidths, indicative of strong phonon-electron scattering over phonon-phonon scattering. The ARPES results demonstrate pronounced dispersion anomalies (kinks) at multiple binding energies within both bulk and topological surface states, indicating a robust and mode-selective coupling between the electronic states and various phonon modes. These experimental findings align with previous calculations of the Eliashberg function, providing a deeper understanding of the highest superconducting transition temperature observed in 2M-WS2 (8.8 K) among all transition metal dichalcogenides as induced by electron-phonon coupling. Furthermore, our results may offer valuable insights into other properties of 2M-WS2 and guide the search for high-temperature topological superconductors.
Collapse
Affiliation(s)
- Yiwei Li
- Institute for Advanced Studies (IAS), Wuhan University, Wuhan, China.
| | - Lixuan Xu
- Department of Physics, Hubei University, Wuhan, China
| | - Gan Liu
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
| | - Yuqiang Fang
- School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Huijun Zheng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai, China
| | - Shenghao Dai
- Institute for Advanced Studies (IAS), Wuhan University, Wuhan, China
| | - Enting Li
- Institute for Advanced Studies (IAS), Wuhan University, Wuhan, China
| | - Guang Zhu
- Institute for Advanced Studies (IAS), Wuhan University, Wuhan, China
| | - Shihao Zhang
- School of Physics and Electronics, Hunan University, Changsha, China
| | - Shiheng Liang
- Department of Physics, Hubei University, Wuhan, China
| | - Lexian Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China
| | - Fuqiang Huang
- School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Xiaoxiang Xi
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China.
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.
| | - Zhongkai Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.
- ShanghaiTech Laboratory for Topological Physics, Shanghai, China.
| | - Nan Xu
- Institute for Advanced Studies (IAS), Wuhan University, Wuhan, China.
- Wuhan Institute of Quantum Technology, Wuhan, China.
| | - Yulin Chen
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai, China
- Department of Physics, University of Oxford, Oxford, UK
| |
Collapse
|
2
|
Zhou JS, Xu RZ, Yu XQ, Cheng FJ, Zhao WX, Du X, Wang SZ, Zhang QQ, Gu X, He SM, Li YD, Ren MQ, Ma XC, Xue QK, Chen YL, Song CL, Yang LX. Evidence for Band Renormalizations in Strong-Coupling Superconducting Alkali-Fulleride Films. PHYSICAL REVIEW LETTERS 2023; 130:216004. [PMID: 37295091 DOI: 10.1103/physrevlett.130.216004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 02/06/2023] [Accepted: 04/17/2023] [Indexed: 06/12/2023]
Abstract
There has been a long-standing debate about the mechanism of the unusual superconductivity in alkali-intercalated fullerides. In this Letter, using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of superconducting K_{3}C_{60} thin films. We observe a dispersive energy band crossing the Fermi level with the occupied bandwidth of about 130 meV. The measured band structure shows prominent quasiparticle kinks and a replica band involving the Jahn-Teller active phonon modes, which reflects strong electron-phonon coupling in the system. The electron-phonon coupling constant is estimated to be about 1.2, which dominates the quasiparticle mass renormalization. Moreover, we observe an isotropic nodeless superconducting gap beyond the mean-field estimation (2Δ/k_{B}T_{c}≈5). Both the large electron-phonon coupling constant and large reduced superconducting gap suggest a strong-coupling superconductivity in K_{3}C_{60}, while the electronic correlation effect is suggested by the observation of a waterfall-like band dispersion and the small bandwidth compared with the effective Coulomb interaction. Our results not only directly visualize the crucial band structure but also provide important insights into the mechanism of the unusual superconductivity of fulleride compounds.
Collapse
Affiliation(s)
- J S Zhou
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - R Z Xu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Q Yu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - F J Cheng
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - W X Zhao
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Du
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - S Z Wang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Q Q Zhang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Gu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - S M He
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - Y D Li
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - M Q Ren
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X C Ma
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - Q K Xue
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Y L Chen
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China
| | - C L Song
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - L X Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| |
Collapse
|
3
|
Gilmore K. Quantifying vibronic coupling with resonant inelastic X-ray scattering. Phys Chem Chem Phys 2023; 25:217-231. [DOI: 10.1039/d2cp00968d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Electron–phonon interactions are fundamental to the behavior of chemical and physical systems.
Collapse
Affiliation(s)
- Keith Gilmore
- Physics Department and IRIS Adlershof, Humboldt-Universität zu Berlin, Zum Großen Windkanal 2, 12489 Berlin, Germany
- European Theoretical Spectroscopy Facility (ETSF), Berlin, Germany
| |
Collapse
|
4
|
Sheng S, Wu JB, Cong X, Zhong Q, Li W, Hu W, Gou J, Cheng P, Tan PH, Chen L, Wu K. Raman Spectroscopy of Two-Dimensional Borophene Sheets. ACS NANO 2019; 13:4133-4139. [PMID: 30913391 DOI: 10.1021/acsnano.8b08909] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The successful fabrication of a two-dimensional boron sheet, which features a triangular lattice with periodic hole arrays, has stimulated great interest in its specific structure as well as properties such as possible superconductivity. Here, we report a study on the vibrational spectra and electron-phonon coupling (EPC) in monolayer boron sheets by in situ Raman and tip-enhanced Raman spectroscopy (TERS) at low temperature and ultrahigh vacuum. The gap-mode TERS gives a 3 × 109 selective enhancement on vertical vibrational Raman modes. A spatial resolution of 1 nm is achieved in this system. Combined with first-principle calculations, the vibrational properties as well as EPC in borophene are determined. The results are helpful for further study on the mechanical, electronic, and possible superconducting properties of two-dimensional boron.
Collapse
Affiliation(s)
- Shaoxiang Sheng
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jiang-Bin Wu
- State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xin Cong
- State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Qing Zhong
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Wenbin Li
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Wenqi Hu
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jian Gou
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Peng Cheng
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ping-Heng Tan
- State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Lan Chen
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Kehui Wu
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physics , University of Chinese Academy of Sciences , Beijing 100049 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
| |
Collapse
|
5
|
Yao M, Pischedda V, San Miguel A. Raman study of the electron-phonon interaction in light alkali metal intercalated metallic fullerides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:115701. [PMID: 21368359 DOI: 10.1088/0953-8984/23/11/115701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
By laser-irradiating polymeric Li(4)C(60) and Na(4)C(60), we have obtained pure monomeric metallic phases stable at ambient conditions. Based on a systemic Raman analysis, we have determined the electron-phonon coupling constant for both metallic phases. The e-p coupling constants of Li- and Na-intercalated metallic fullerides are smaller than those of superconductive K(3)C(60) and Rb(3)C(60) and comparable to or slightly higher than that of ambient-pressure non-superconductive Cs(3)C(60). We predict that Na-doped fulleride could exhibit superconductivity with T(c) ∼ 10 K. Much lower T(c) or even no superconductivity can be expected for the Li-doped fulleride which exhibits a strong Li(+)-C interaction. These results contribute to the understanding of superconductivity in light alkali metal intercalated fullerides.
Collapse
Affiliation(s)
- Mingguang Yao
- Université de Lyon, Laboratoire PMCN, CNRS, UMR 5586, Villeurbanne, France.
| | | | | |
Collapse
|
6
|
Yao M, Pischedda V, Wågberg T, Sundqvist B, Floch SL, Miguel AS. Laser-induced transformation of Li4C60 and Na4C60 polymers into metallic monomeric fulleride phases. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
7
|
Graja A, Lipiec R, Polomska M. Electron–vibrational mode coupling in (Ph4P)2·C60·I from Raman scattering. J Mol Struct 2000. [DOI: 10.1016/s0022-2860(00)00594-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
8
|
Raman Scattering in Fullerenes and Related Carbon-Based Materials. RAMAN SCATTERING IN MATERIALS SCIENCE 2000. [DOI: 10.1007/978-3-662-04221-2_10] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
9
|
|
10
|
Kubozono Y, Fujiki S, Hiraoka K, Urakawa T, Takabayashi Y, Kashino S, Iwasa Y, Kitagawa H, Mitani Y. Raman study of Cs3C60 under ambient pressure. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)01220-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
11
|
Preparation of NaC60 and its physical properties revealed by differential scanning calorimetry, 23Na-NMR and ESR. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00394-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Tosatti E, Manini N, Gunnarsson O. Surprises in the orbital magnetic moment and g factor of the dynamic Jahn-Teller ion C60-. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:17184-17190. [PMID: 9985854 DOI: 10.1103/physrevb.54.17184] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
Guha S, Menéndez J, Page JB, Adams GB. Empirical bond polarizability model for fullerenes. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:13106-13114. [PMID: 9982989 DOI: 10.1103/physrevb.53.13106] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
14
|
Carlile C, Durand R, Fullagar W, Reynolds P, Trouw F, White J. Inelastic neutron scattering and superconductivity of Rb3C60(NH3)x. Mol Phys 1995. [DOI: 10.1080/00268979500101821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
15
|
Tanaka K, Huang Y, Yamabe T. Semiempirical estimation of the intermolecular electron-phonon coupling in K3C60 and Rb3C60. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12715-12720. [PMID: 9978045 DOI: 10.1103/physrevb.51.12715] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
16
|
Martin MC, Koller D, Rosenberg A, Kendziora C, Mihaly L. Infrared and Raman evidence for dimers and polymers in RbC60. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:3210-3213. [PMID: 9979110 DOI: 10.1103/physrevb.51.3210] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
17
|
Kelly MK, Thomsen C. Excitation energy and temperature-dependent Raman study of Rb3C60 films. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:18572-18579. [PMID: 9976293 DOI: 10.1103/physrevb.50.18572] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
18
|
Sanguinetti S, Benedek G. Charge-induced vibrational shifts and vibronic coupling constant in charged C60n-. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:15439-15441. [PMID: 9975905 DOI: 10.1103/physrevb.50.15439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
19
|
Wang ZH, Dresselhaus MS, Dresselhaus G, Wang KA, Eklund PC. Electronic transport properties of KxC70 thin films. II. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:15890-15900. [PMID: 10010723 DOI: 10.1103/physrevb.49.15890] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
20
|
Martin MC, Koller D, Du X, Stephens PW, Mihaly L. Insulating and conducting phases of RbC60. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:10818-10821. [PMID: 10009925 DOI: 10.1103/physrevb.49.10818] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
21
|
Wang ZH, Dresselhaus MS, Dresselhaus G, Eklund PC. Raman studies of electron-phonon interaction in KxC70. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:16881-16884. [PMID: 10008288 DOI: 10.1103/physrevb.48.16881] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|