Quantum transport evidence of isolated topological nodal-line fermions

Kim, Ho-Il; Ok, Jong Mok; Cha, Seyeong; Jang, Bo Gyu; Kwon, Chang Il; Kohama, Yoshimitsu; Kindo, Koichi; Cho, Won Joon; Choi, Eun Sang; Jo, Y. J.; Kang, W.; Shim, Jong Hyun; Kim, Keun Su; Kim, Jun Sung

doi:10.1038/s41467-022-34845-x

Cited by 7 publications

(2 citation statements)

References 54 publications

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“…The ground state is obtained for a non-magnetic configuration We observed a gap opening of the order of 10 meV. The observed gap is significantly comparable to that of the reported other nodal-line semimetals [23,60,65]. Figure 4(e) presents the character band along Γ-S 0 without SOC and with SOC.…”

Section: Electronic Structure Propertiessupporting

confidence: 78%

Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study

Kumar Pradhan,

Pradhan,

Mal

et al. 2024

J. Phys.: Condens. Matter

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Kagome-lattice crystal is crucial in quantum materials research,exhibiting unique transport properties due to its rich band structure and the presenceof nodal lines and rings. Here, we investigate the electronic transport propertiesand perform first-principles calculations for Ni3In2Se2 kagome topological semimetal.First-principles calculations of the band structure without the inclusion of spin-orbitcoupling (SOC) shows that three bands are crossing the Fermi level (EF ), indicatingthe semi-metallic nature. With SOC, the band structure reveals a gap openingof the order of 10 meV. Z2 index calculations suggest the topologically nontrivialnatures (ν0;ν1ν2ν3)=(1;111) both without and with SOC. Our detailed calculationsalso indicate six endless Dirac nodal lines and two nodal rings with a π-Berry phasein the absence of SOC. The temperature-dependent resistivity is dominated by twoscattering mechanisms: s-d interband scattering occurs below 50 K, while electronphonon (e-p) scattering is observed above 50 K. The magnetoresistance (MR) curvealigns with the theory of extended Kohler’s rule, suggesting multiple scattering originsand temperature-dependent carrier densities. A maximum MR of 120% at 2 K and 9 T,with a maximum estimated mobility of approximately 3000 cm2V−1s−1 are observed.Ni3In2Se2 is an electron-hole compensated topological semimetal, as we have carrierdensity of electron (ne) and hole (nh) are ne≈nh, estimated from Hall effect datafitted to a two-band model. Consequently, there is an increase in the mobility ofelectrons and holes, leading to a higher carrier mobility and a comparatively highermagnetoresistance. The quantum interference effect leading to the two dimensional(2D) weak antilocalization effect (-σxx∝ ln(B)) manifests as the diffusion of nodal linefermions in the 2D poloidal plane and the associated encircling Berry flux of nodal-linefermions.

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Section: Electronic Structure Propertiessupporting

confidence: 78%

Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study

Kumar Pradhan,

Pradhan,

Mal

et al. 2024

J. Phys.: Condens. Matter

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“…These NLSs have been found or proposed to reveal much more exciting features. These include non-Abelian band topology [76][77][78], distinct collective modes [79,80], correlation effects [81,82], second-order NLSs [83][84][85], and novel transport, the last of which is also exhibiting exotic phenomena such as flat Landau-level spectrum [86], anomalous Hall current [87][88][89][90], parity anomaly [91][92][93], fully spin-polarized transport [94], anomalous Andreev reflection [95], and weak antilocalization [96,97]. However, less attention has been paid on the transport phenomenon directly related to the drumhead surface states of the NLSs, and one may ask a question: Whether do there exist transport properties characterized by these surface modes?…”

Section: Introductionmentioning

confidence: 99%

Quantum transport on the surfaces of topological nodal-line semimetals

Fu,

Guan,

Xie

et al. 2024

New J. Phys.

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Topological nodal-line semimetals are always characterized by the drumhead surface states at the open boundaries. In this paper we first derive an analytical expression for the surface Green’s function of a nodal-line semimetal. By making use of this result, we explore the charge and spin transport properties of a metallic chain on the surface of a nodal line semimetal, as functions of the gate voltage applied on the top of the material. According to the size of the nodal loop, due to the coupling to the surface modes, the charge conductance in the chain is found to show a robust plateau at e2/h, or to exhibit multiple valleys at e2/h. Correspondingly, the spin polarization of the transmitted current is 100% at the plateau region, or exhibits multiple peaks at nearly 100%. This feature can be viewed as a transport signature of the topological nodal-line semimetals.

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Protein dynamics: The future is bright and complicated!

Nam

Wolf‐Watz

2023

Structural Dynamics

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Biological life depends on motion, and this manifests itself in proteins that display motion over a formidable range of time scales spanning from femtoseconds vibrations of atoms at enzymatic transition states, all the way to slow domain motions occurring on micro to milliseconds. An outstanding challenge in contemporary biophysics and structural biology is a quantitative understanding of the linkages among protein structure, dynamics, and function. These linkages are becoming increasingly explorable due to conceptual and methodological advances. In this Perspective article, we will point toward future directions of the field of protein dynamics with an emphasis on enzymes. Research questions in the field are becoming increasingly complex such as the mechanistic understanding of high-order interaction networks in allosteric signal propagation through a protein matrix, or the connection between local and collective motions. In analogy to the solution to the “protein folding problem,” we argue that the way forward to understanding these and other important questions lies in the successful integration of experiment and computation, while utilizing the present rapid expansion of sequence and structure space. Looking forward, the future is bright, and we are in a period where we are on the doorstep to, at least in part, comprehend the importance of dynamics for biological function.

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Quantum transport evidence of isolated topological nodal-line fermions

Cited by 7 publications

References 54 publications

Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study

Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study

Quantum transport on the surfaces of topological nodal-line semimetals

Protein dynamics: The future is bright and complicated!

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Quantum transport evidence of isolated topological nodal-line fermions

Cited by 7 publications

References 54 publications

Endless Dirac nodal lines and high mobility in kagome semimetal Ni3In2Se2 : a theoretical and experimental study

Endless Dirac nodal lines and high mobility in kagome semimetal Ni3In2Se2 : a theoretical and experimental study

Quantum transport on the surfaces of topological nodal-line semimetals

Protein dynamics: The future is bright and complicated!

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Product

Resources

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Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study

Endless Dirac nodal lines and high mobility in kagome semimetal Ni₃In₂Se₂ : a theoretical and experimental study