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Growth and characterization of Bi(110)/CrTe_(2) heterostructures:Exploring interplay between magnetism and topology
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作者 袁震宇 杨发枝 +4 位作者 吕佰晴 黄耀波 钱天 徐金朋 丁洪 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期449-455,共7页
The interplay between topology and magnetism is vital for realizing exotic quantum phenomena,significant examples including quantum anomalous Hall effect,axion insulators,and high-order topological states.These states... The interplay between topology and magnetism is vital for realizing exotic quantum phenomena,significant examples including quantum anomalous Hall effect,axion insulators,and high-order topological states.These states host great potential for future applications in high-speed and low-consumption electronic devices.Despite being extensively investigated,practical platforms are still scarce.In this work,with molecular beam epitaxy(MBE),we provide the first experimental report on high-quality Bi(110)/CrTe_(2) magnetic heterostructure.By employing in-situ high-resolution scanning tunneling microscopy,we are able to examine the interaction between magnetism and topology.There is a potential edge state at an energy level above the Fermi level,but no edge states observed near the Fermi level The absence of high-order topological corner states near EF highlights the importance of lattice matching and interface engineering in designing high-order topological states.Our study provides key insights into the interplay between two-dimensional magnetic and topological materials and offers an important dimension for engineering magnetic topological states. 展开更多
关键词 bismuth(110) chromium ditelluride(CrTe_(2)) topological states scanning tunneling microscopy(STM)
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Distinct behavior of electronic structure under uniaxial strain in BaFe_(2)As_(2)
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作者 李佳俊 Giao Ngoc Phan +10 位作者 王兴玉 杨发枝 胡全欣 贾可 赵金 刘文尧 张任杰 石友国 李世亮 钱天 丁洪 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第1期675-679,共5页
We report a study of the electronic structure of BaFe_(2)As_(2) under uniaxial strains using angle-resolved photoemission spectroscopy and transport measurements. Two electron bands at the MY point, with an energy spl... We report a study of the electronic structure of BaFe_(2)As_(2) under uniaxial strains using angle-resolved photoemission spectroscopy and transport measurements. Two electron bands at the MY point, with an energy splitting of 50 meV in the strain-free sample, shift downward and merge into each other under a large uniaxial strain, while three hole bands at theГ point shift downward together. However, we also observed an enhancement of the resistance anisotropy under uniaxial strains by electrical transport measurements, implying that the applied strains strengthen the electronic nematic order in BaFe_(2)As_(2). These observations suggest that the splitting of these two electron bands at the MY point is not caused by the nematic order in BaFe_(2)As_(2). 展开更多
关键词 iron-based superconductor angle-resolved photoelectron spectroscopy uniaxial strain symmetry breaking
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Observation of Zero-Energy Modes with Possible Time-Reversal Symmetry Breaking on Step Edge of CaKFe_(4)As_(4)
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作者 Lu Cao Geng Li +15 位作者 Wenyao Liu Ya-Bin Liu Hui Chen Yuqing Xing Lingyuan Kong Fazhi Yang Quanxin Hu Meng Li Xingtai Zhou Zichao Chen Chenhang Ke Lunhui Hu Guang-Han Cao Congjun Wu Hong Ding Hong-Jun Gao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第11期114-127,共14页
Topologically nontrivial Fe-based superconductors attract extensive attentions due to their ability of hosting Majorana zero modes(MZMs)which could be used for topological quantum computation.Topological defects such ... Topologically nontrivial Fe-based superconductors attract extensive attentions due to their ability of hosting Majorana zero modes(MZMs)which could be used for topological quantum computation.Topological defects such as vortex lines are required to generate MZMs.Here,we observe the robust edge states along the surface steps of CaKFe_(4)As_(4).Remarkably,the tunneling spectra show a sharp zero-bias peak(ZBP)with multiple integerquantized states at the step edge under zero magnetic field.We propose that the increasing hole doping around step edges may drive the local superconductivity into a state with possible spontaneous time-reversal symmetry breaking.Consequently,the ZBP can be interpreted as an MZM in an effective vortex in the superconducting topological surface state by proximity to the center of a tri-junction with different superconducting order parameters.Our results provide new insights into the interplay between topology and unconventional superconductivity,and pave a new path to generate MZMs without magnetic field. 展开更多
关键词 VORTEX OBSERVATION BREAKING
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Fe1+yTexSe1-x:A Delicate and Tunable Majorana Material
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作者 杨发枝 Giao Ngoc Phan +10 位作者 张任杰 赵金 李佳俊 鲁邹有为 John Schneeloch 钟瑞丹 马明伟 顾根大 董晓莉 钱天 丁洪 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第1期48-52,共5页
We report the observation for the pz electron band and the band inversion in Fe1+yTexSe1-xwith angleresolved photoemission spectroscopy. Furthermore, we found that excess Fe(y>0) inhibits the topological band inver... We report the observation for the pz electron band and the band inversion in Fe1+yTexSe1-xwith angleresolved photoemission spectroscopy. Furthermore, we found that excess Fe(y>0) inhibits the topological band inversion in Fe1+yTexSe1-x,which explains the absence of Majorana zero modes in previous reports for Fe1+yTexSe1-xwith excess Fe. Based on our analysis of different amounts of Te doping and excess Fe, we propose a delicate topological phase in this material. Thanks to this delicate phase, one may be able to tune the topological transition via applying lattice strain or carrier doping. 展开更多
关键词 SPECTROSCOPY MATERIAL TOPOLOGICAL
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Continuously Doping Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)into Electron-Doped Superconductor by CaH_(2)Annealing Method
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作者 Jin Zhao Yu-Lin Gan +15 位作者 Guang Yang Yi-Gui Zhong Cen-Yao Tang Fa-Zhi Yang Giao Ngoc Phan Qiang-Tao Sui Zhong Liu Gang Li Xiang-Gang Qiu Qing-Hua Zhang Jie Shen Tian Qian Li Lu Lei Yan Gen-Da Gu Hong Ding 《Chinese Physics Letters》 SCIE EI CAS CSCD 2022年第7期93-97,共5页
As a typical hole-doped cuprate superconductor,Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)(Bi2212)carrier doping is mostly determined by its oxygen content.Traditional doping methods can regulate its doping level within the range of... As a typical hole-doped cuprate superconductor,Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)(Bi2212)carrier doping is mostly determined by its oxygen content.Traditional doping methods can regulate its doping level within the range of hole doping.Here we report the first application of CaH_(2)annealing method in regulating the doping level of Bi2212.By continuously controlling the anneal time,a series of differently doped samples can be obtained.The combined experimental results of x-ray diffraction,scanning transmission electron microscopy,resistance and Hall measurements demonstrate that the CaH_(2)induced topochemical reaction can effectively change the oxygen content of Bi2212 within a very wide range,even switching from hole doping to electron doping.We also found evidence of a low-T_c superconducting phase in the electron doping side. 展开更多
关键词 into Electron-Doped Superconductor by CaH_(2)Annealing Method Continuously Doping Bi_(2)Sr_(2)CaCu_(2)O
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