Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4
Electronic systems with quasi-one-dimensional (Q1D) Fermi surface tend to form either a charge-density-wave (CDW) or a spin-density-wave ground state at low temperatures due to one-dimensional instabilities. Among various CDW states, surface CDWs are different from that within the bulk due to the re...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aba065 |
| _version_ | 1797750454526935040 |
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| author | Haigen Sun Zhibin Shao Tianchuang Luo Qiangqiang Gu Zongyuan Zhang Shaojian Li Lijun Liu Habakubaho Gedeon Xin Zhang Qi Bian Ji Feng Jian Wang Minghu Pan |
| author_facet | Haigen Sun Zhibin Shao Tianchuang Luo Qiangqiang Gu Zongyuan Zhang Shaojian Li Lijun Liu Habakubaho Gedeon Xin Zhang Qi Bian Ji Feng Jian Wang Minghu Pan |
| author_sort | Haigen Sun |
| collection | DOAJ |
| description | Electronic systems with quasi-one-dimensional (Q1D) Fermi surface tend to form either a charge-density-wave (CDW) or a spin-density-wave ground state at low temperatures due to one-dimensional instabilities. Among various CDW states, surface CDWs are different from that within the bulk due to the reduced dimensionality. Here we report the systematic investigation of charge density modulation on the surface of in situ cleaved TaTe _4 crystal by means of low temperature scanning tunneling microscopy/spectroscopy, corroborated with density functional theory calculation. Well-defined Q1D modulation (4 a , 6 c ) accompanied with a periodic lattice distortion is clearly observed on the (010) cleaved surface, distinct from that of its bulk CDW (2 a × 2 a × 3 c ). Tunneling spectroscopic measurements reveal a partially-opened energy gap about 23 meV around Fermi level. Such gap shows similar spatial variation with the periodicity of surface modulation and diminishes subsequently as temperature rises, which indicates a novel surface-related CDW gap states. The surface modulation vectors fit well with the Fermi surface nesting vectors, derived from the calculated Fermi surfaces. Surprisingly, such surface modulation can be suppressed greatly by applying vertical magnetic field and a critical field about 9.05 T can be estimated from field-dependent data. Our results demonstrate that this unique CDW modulation is strongly related to Fermi surface nesting mediated electron–electron coupling due to the reduced dimensionality of the surface, and can be readily tuned by relatively small magnetic field. |
| first_indexed | 2024-03-12T16:32:58Z |
| format | Article |
| id | doaj.art-e2907339b88a424d96375692efd771e5 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:32:58Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-e2907339b88a424d96375692efd771e52023-08-08T15:25:36ZengIOP PublishingNew Journal of Physics1367-26302020-01-0122808302510.1088/1367-2630/aba065Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4Haigen Sun0Zhibin Shao1Tianchuang Luo2Qiangqiang Gu3Zongyuan Zhang4Shaojian Li5Lijun Liu6Habakubaho Gedeon7Xin Zhang8Qi Bian9Ji Feng10Jian Wang11https://orcid.org/0000-0002-7212-0904Minghu Pan12https://orcid.org/0000-0002-1520-209XSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics and Information Technology, Shaanxi Normal University , Xi’an 710062, People’s Republic of ChinaInternational Center for Quantum Materials, School of Physics, Peking University , 100871 Beijing, People’s Republic of China; Collaborative Innovation Center of Quantum Matter , 100871 Beijing, People’s Republic of ChinaInternational Center for Quantum Materials, School of Physics, Peking University , 100871 Beijing, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of ChinaInternational Center for Quantum Materials, School of Physics, Peking University , 100871 Beijing, People’s Republic of China; Collaborative Innovation Center of Quantum Matter , 100871 Beijing, People’s Republic of China; CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences , Beijing 100190, People’s Republic of ChinaInternational Center for Quantum Materials, School of Physics, Peking University , 100871 Beijing, People’s Republic of China; Collaborative Innovation Center of Quantum Matter , 100871 Beijing, People’s Republic of China; CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences , Beijing 100190, People’s Republic of China; Beijing Academy of Quantum Information Sciences , Beijing 100193, People’s Republic of ChinaSchool of Physics, Huazhong University of Science and Technology , Wuhan 430074, People’s Republic of China; School of Physics and Information Technology, Shaanxi Normal University , Xi’an 710062, People’s Republic of ChinaElectronic systems with quasi-one-dimensional (Q1D) Fermi surface tend to form either a charge-density-wave (CDW) or a spin-density-wave ground state at low temperatures due to one-dimensional instabilities. Among various CDW states, surface CDWs are different from that within the bulk due to the reduced dimensionality. Here we report the systematic investigation of charge density modulation on the surface of in situ cleaved TaTe _4 crystal by means of low temperature scanning tunneling microscopy/spectroscopy, corroborated with density functional theory calculation. Well-defined Q1D modulation (4 a , 6 c ) accompanied with a periodic lattice distortion is clearly observed on the (010) cleaved surface, distinct from that of its bulk CDW (2 a × 2 a × 3 c ). Tunneling spectroscopic measurements reveal a partially-opened energy gap about 23 meV around Fermi level. Such gap shows similar spatial variation with the periodicity of surface modulation and diminishes subsequently as temperature rises, which indicates a novel surface-related CDW gap states. The surface modulation vectors fit well with the Fermi surface nesting vectors, derived from the calculated Fermi surfaces. Surprisingly, such surface modulation can be suppressed greatly by applying vertical magnetic field and a critical field about 9.05 T can be estimated from field-dependent data. Our results demonstrate that this unique CDW modulation is strongly related to Fermi surface nesting mediated electron–electron coupling due to the reduced dimensionality of the surface, and can be readily tuned by relatively small magnetic field.https://doi.org/10.1088/1367-2630/aba065surface charge density wavescanning tunneling microscopyelectron–electron interactionFermi surface nesting |
| spellingShingle | Haigen Sun Zhibin Shao Tianchuang Luo Qiangqiang Gu Zongyuan Zhang Shaojian Li Lijun Liu Habakubaho Gedeon Xin Zhang Qi Bian Ji Feng Jian Wang Minghu Pan Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 New Journal of Physics surface charge density wave scanning tunneling microscopy electron–electron interaction Fermi surface nesting |
| title | Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 |
| title_full | Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 |
| title_fullStr | Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 |
| title_full_unstemmed | Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 |
| title_short | Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe4 |
| title_sort | discovery of an unconventional charge modulation on the surface of charge density wave material tate4 |
| topic | surface charge density wave scanning tunneling microscopy electron–electron interaction Fermi surface nesting |
| url | https://doi.org/10.1088/1367-2630/aba065 |
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