Simin Nie

Stanford University

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Hongming Weng

Institute of Physics

Zhong Fang

Institute of Physics

Zhijun Wang

Chongqing University of Technology

Hong Ding

Shanghai Jiao Tong University

Tian Qian

Chinese Academy of Sciences

Xi Dai

Tianjin Normal University

P. Richard

Université Paris-Saclay

Zhida Song

Peking University

Junzhang Ma

City University of Hong Kong

Yuting Qian

Institute of Hydrobiology

Cooperative Institutions

Chinese Academy of Sciences

218

Institute of Physics

148

University of Chinese Academy of Sciences

145

National Laboratory for Superconductivity

Czech Academy of Sciences, Institute of Physics

University of Science and Technology of China

ShanghaiTech University

Songshan Lake Materials Laboratory

Paul Scherrer Institute

Tsinghua University

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Observation of electronic structure and electron-boson coupling in the low-dimensional superconductor Ta4Pd3Te16

Physical review. B./Physical review. B (2021)

Haifeng Yang Xiaolei Liu Simin Nie Wujun Shi Kui Huang

Ternary telluride ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$ is a layered superconductor with quasi-one-dimensional characteristics. It has attracted great research interests due to the possible nodal superconductivity and its interplay with adjacent charge-density wave as well as proposed nontrivial band topology. Here, we report low-energy electronic band structure of ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$ by means of high-resolution laser-based angle-resolved photoemission spectroscopy. We acquired the Fermi surface and detailed band dispersions, directly reflecting its multiband nature. Furthermore, dispersion kinks at \ensuremath{\sim}8 meV below the Fermi level are unambiguously observed, indicative of strong electron-boson coupling. We suggest these kinks are probably due to electron-phonon coupling with effective coupling constants quantified to be \ensuremath{\sim}0.72 and \ensuremath{\sim}0.48 for the ${\ensuremath{\gamma}}_{1}$ and ${\ensuremath{\gamma}}_{2}$ bands, respectively. Our results provide valuable information for future studies on the mechanism of superconductivity as well as its intimacy to charge-density wave in ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$.

Charge Density Wave

10.1103/physrevb.104.l220501

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Topological semimetal in honeycomb lattice LnSI

Proceedings of the National Academy of Sciences (2017)

Simin Nie Gang Xu Fritz B. Prinz Shou-Cheng Zhang

Recognized as elementary particles in the standard model,Weyl fermions in condensed matter have received growing attention. However, most of the previously reportedWeyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the underlying physics. Here, we report for the first time promising topological phases that can be realized in specific honeycomb lattices, including ideal Weyl semimetal structures, 3D strong topological insulators, and nodal-line semimetal configurations. In particular, we highlight a novel semimetal featuring both Weyl nodes and nodal lines. Guided by this model, we demonstrated that GdSI the long perceived ideal Weyl semimetal has two pairs ofWeyl nodes residing at the Fermi level, and that LuSI (YSI) is a 3D strong topological insulator with the right-handed helical surface states. Our work provides a new mechanism to study topological semimetals, and proposes a platform towards exploring the physics of Weyl semimetals as well as related device designs.

Lattice (music)

Honeycomb

10.1073/pnas.1713261114

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Topological nodal-line semimetals in ferromagnetic rare-earth-metal monohalides

Simin Nie Hongming Weng Fritz B. Prinz

The topological nodal-line semimetals (TNLSs) found so far are extremely limited to nonmagnetic materials and most of them are spinless. Here, the authors find from first-principles calculations and an effective model analysis that the single-layer rare-earth monohalides La$X$ and single-layer Gd$X$ (where $X$ is Cl or Br) are ideal 2D Weyl semimetals and large-gap 2D quantum anomalous Hall insulators (QAHIs), respectively. Moreover, 3D La$X$ and 3D Gd$X$ are TNLSs and 3D weak QAHIs, respectively. The nodal lines in 3D La$X$ are robust against strong spin-orbit coupling, providing a novel platform toward exploring the exotic properties in nodal-line fermions.

Line (geometry)

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Topological electronic states in HfRuP family superconductors

npj Computational Materials (2019)

Yuting Qian Simin Nie Changjiang Yi Lingyuan Kong Chen Fang

Based on the first-principles calculations and experimental measurements, we report that the hexagonal phase of ternary transition metal pnictides TT'X (T=Zr, Hf; T'=Ru; X=P, As), which are well-known noncentrosymmetric superconductors with relatively high transition temperatures, host nontrivial bulk topology. Before the superconducting phase transition, we find that HfRuP belongs to a Weyl semimetal phase with 12 pairs of type-II Weyl points, while ZrRuAs, ZrRuP and HfRuAs belong to a topological crystalline insulating phase with trivial Fu-Kane $\mathbb Z_2$ indices but $nontrivial$ mirror Chern numbers. High-quality single crystal samples of the noncentrosymmetric superconductors with these two different topological states have been obtained and the superconductivity is verified experimentally. The wide-range band structures of ZrRuAs have been identified by ARPES and reproduced by theoretical calculations. Combined with intrinsic superconductivity, the nontrivial topology of the normal state may generate unconventional superconductivity in both bulk and surfaces. Our findings could largely inspire the experimental searching for possible topological superconductivity in these compounds.

Weyl semimetal

10.1038/s41524-019-0260-6

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Optical spectroscopy study ofNd(O,F)BiS2single crystals

Physical Review B (2014)

X. B. Wang Simin Nie H. P. Wang P. Zheng P. Wang

We present an optical spectroscopy study on F-substituted NdOBiS$_2$ superconducting single crystals grown using KCl/LiCl flux method. The measurement reveals a simple metallic response with a relatively low screened plasma edge near 5000 \cm. The plasma frequency is estimated to be 2.1 eV, which is much smaller than the value expected from the first-principles calculations for an electron doping level of x=0.5, but very close to the value based on a doping level of 7$\%$ of itinerant electrons per Bi site as determined by ARPES experiment. The energy scales of the interband transitions are also well reproduced by the first-principles calculations. The results suggest an absence of correlation effect in the compound, which essentially rules out the exotic pairing mechanism for superconductivity or scenario based on the strong electronic correlation effect. The study also reveals that the system is far from a CDW instability as being widely discussed for a doping level of x=0.5.

10.1103/physrevb.90.054507

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Orthorhombic carbon oC24: A novel topological nodal line semimetal

Carbon (2018)

Zhenzhen Li Jia Chen Simin Nie Lifang Xu Hiroshi Mizuseki

Brillouin zone

Orthorhombic crystal system

Carbon fibers

10.1016/j.carbon.2018.03.003

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Magnetic semimetals and quantized anomalous Hall effect in EuB 6

Bulletin of the American Physical Society (2020)

Simin Nie

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Topological phases in the TaSe3 compound

Bulletin of the American Physical Society (2021)

Simin Nie Lingyi Xing Rongying Jin Weiwei Xie Zhijun Wang

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Giant anomalous Hall effect and band folding in a Kagome metal with mixed dimensionality

arXiv (Cornell University) (2024)

Erjian Cheng Kaipu Wang Simin Nie Tianping Ying Zongkai Li

Magnetic metals with geometric frustration offer a fertile ground for studying novel states of matter with strong quantum fluctuations and unique electromagnetic responses from conduction electrons coupled to spin textures. Recently, TbTi$_3$Bi$_4$ has emerged as such an intriguing platform as it behaves as a quasi-one-dimension (quasi-1D) Ising magnet with antiferromagnetic orderings at 20.4 K and 3 K, respectively. Magnetic fields along the Tb zigzag-chain direction reveal plateaus at 1/3 and 2/3 of saturated magnetization, respectively. At metamagnetic transition boundaries, a record-high anomalous Hall conductivity of 6.2 $\times$ 10$^5$ $\Omega^{-1}$ cm$^{-1}$ is observed. Within the plateau, noncollinear magnetic texture is suggested. In addition to the characteristic Kagome 2D electronic structure, ARPES unequivocally demonstrates quasi-1D electronic structure from the Tb 5$d$ bands and a quasi-1D hybridization gap in the magnetic state due to band folding with $q$ = (1/3, 0, 0) possibly from the spin-density-wave order along the Tb chain. These findings emphasize the crucial role of mixed dimensionality and the strong coupling between magnetic texture and electronic band structure in regulating physical properties of materials, offering new strategies for designing materials for future spintronics applications.

Folding (DSP implementation)

10.48550/arxiv.2405.16831

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Observation of topological electronic structure in quasi-1D superconductor TaSe 3

Bulletin of the American Physical Society (2021)

Zhongkai Liu C. H. Cheng Aiji Liang Shuai Liu Simin Nie

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