Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI

Sasaki, Minoru; Kim, Kyoung-Min; Ohnishi, Akira; Kitaura, Mamoru; Tomita, Norikazu; Kulbachinskii, V. A.; Kim, Ki-Seok; Kim, Heon‐Jung

doi:10.1103/physrevb.92.205121

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…The µ value of the τ -orbit is significantly larger than those of the other orbits. When E F is very close to the node, the impurity scattering is drastically reduced, as previously observed in graphene [31] and BiTeI [32]. Thus, the large value of µ implies Dirac or Weyl metallicity of the orbit.…”

Section: Resultssupporting

confidence: 56%

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Shon

Ryu

Kim

et al. 2019

Materials Today Physics

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Weyl semimetal is a topologically non-trivial phase of matter with pairs of Weyl nodes in the k-space, which act as monopole and anti-monopole pairs of Berry curvature. Two hallmarks of the Weyl metallic state are the topological surface state called the Fermi arc and the chiral anomaly. It is known that the chiral anomaly yields anomalous magneto-transport phenomena. In this study, we report the emergence of the type-II Weyl semimetallic state in the geometrically frustrated non-collinear antiferromagnetic Shastry-Sutherland lattice (SSL) GdB 4 crystal. When we apply magnetic fields perpendicular to the noncollinear moments in SSL plane, Weyl nodes are created above and below the Fermi energy along the M-A line (τ -band) because the spin tilting breaks the time-reversal symmetry and lifts band degeneracy while preserving C 4z or C 2z symmetry. The unique electronic structure of GdB 4 under magnetic fields applied perpendicular to the SSL gives rise to a non-trivial Berry phase, detected in de Haas-van Alphen experiments and chiral-anomaly-induced negative magnetoresistance. The emergence of the magnetic field-induced Weyl state in SSL presents a new guiding principle to develop novel types of Weyl semimetals in frustrated spin systems. *

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Section: Resultssupporting

confidence: 56%

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Shon

Ryu

Kim

et al. 2019

Materials Today Physics

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“…In a metal with dilute magnetic impurities, the Kondo effect is usually considered as a many‐body interaction between the localized moments and itinerant electrons through s‐d exchange interaction. [ 87 ] In this scenario, the intercalated Fe atoms may provide local magnetic moments by localized 3d electrons for T d ‐Fe x MoTe 2 crystals. Our first‐principles calculations show that when the Fe atoms are intercalated into MoTe 2 , the system becomes spin polarized, as evidenced by the band structure shown in Figure 10a.…”

Section: Resultsmentioning

confidence: 99%

“…Similar carrier localization behavior and flat bands has also been reported in the Fe-intercalated singlecrystal Fe x TiSe 2 by angle-resolved photoemission spectroscopy (ARPES) experiments. [40,88] More interestingly, a spin-glass state is observed in T d -Fe 0.15 MoTe 2 for the first time, which is the result of the combined effects of frustration of the AFM interactions and quenched net Fe magnetic moments. It is noteworthy that the interplay between Kondo effect and spinglass like behavior has been extensively studied theoretically and experimentally in f-electron spin-glass materials such as U-based heavy fermion compounds, but not in the topologically nontrivial Weyl semimetal.…”

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confidence: 94%

Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂

et al. 2023

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crystals down to few layers and even monolayer. MoTe 2 is a typical member among TMDCs, hosting fascinating electronic properties, such as extremely large magnetoresistance, [6,7] the emergence of superconductivity, [8] the existence of topological Weyl nodes [9][10][11][12] and semiconducting behavior with a finite band gap. [13] Layered structure with weak interlayer coupling allows for the change of layer stacking order and subsequently gives rise to a structural polymorphism. [14][15][16] In fact, MoTe 2 appears in three kinds of structures: the trigonal prismatic coordinated 2H phase (space group P6 3 /mmc), distorted octahedral coordinated structures, including the monoclinic 1T′ (space group P2 1 /m), and the orthorhombic T d (space group Pmn2 1 ) phases. The 2H phase exhibits semiconducting behavior, while 1T′ and T d phases show semimetallic characters. [13,17,18] As shown in Figure 1a, at room temperature, distortion of in-plane bond give rise to monoclinic unit cell 1T′ phase (tilt angle of ≈93.9°). When decreasing the temperature below 250 K, the shift of layer stacking results an orthorhombic structure. [16,19] In its monoclinic 1T′ phase, monolayer MoTe 2 has been proposed to be topological insulator exhibiting quantum spin Hall effect. [3] While the T d phase demonstrates a number of unique properties, such as extremely large magnetoresistance, nontrivial superconductivity, [20][21][22] switchable ferroelectricity, giant nonlinear Hall effect, and unconventional planar spin Weyl semimetal T d -MoTe 2 has recently attracted much attention due to its intriguing electronic properties and potential applications in spintronics. Here, Fe-intercalated T d -Fe x MoTe 2 single crystals (0 < x < 0.15 ) are grown successfully. The electrical and thermoelectric transport results consistently demonstrate that the phase transition temperature T S is gradually suppressed with increasing x. Theoretical calculation suggests that the increased energy of the T d phase, enhanced transition barrier, and more occupied bands in 1T′ phase is responsible for the suppression in T S . In addition, a ρ α -lnT behavior induced by Kondo effect is observed with x ≥ 0.08, due to the coupling between conduction carriers and the local magnetic moments of intercalated Fe atoms. For T d -Fe 0.15 MoTe 2 , a spin-glass transition occurs at ≈10 K. The calculated band structure of T d -Fe 0.25 MoTe 2 shows that two flat bands exist near the Fermi level, which are mainly contributed by the d yz and d x y 2 2 − orbitals of the Fe atoms. Finally, the electronic phase diagram of T d -Fe x MoTe 2 is established for the first time. This work provides a new route to control the structural instability and explore exotic electronic states for transition-metal dichalcogenides.

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“…It is possible that the relative strength of this measured intracontour scattering, unforeseen using our scattering model, may stem from relatively suppressed rate for scattering involving the inner Fermi surface (including intercontour scattering) with respect to scattering involving only the outer Fermi surface, which has recently been discussed in BiTeI. 44 Near the CBM, the measured and simulated QPI dispersion behaviors are in excellent agreement and are both nearly isotropic, as is shown in Figures 3 and 4. Overall, the results displayed in Figures 3 and 4 demonstrate the anticipated suppression of spin-flip backscattering similar to that previously observed in topological insulators.…”

Section: Resultsmentioning

confidence: 99%

Quasiparticle Scattering in the Rashba Semiconductor BiTeBr: The Roles of Spin and Defect Lattice Site

Butler¹,

Yang²,

Sankar³

et al. 2016

ACS Nano

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Observations of quasiparticle interference have been used in recent years to examine exotic carrier behavior at the surfaces of emergent materials, connecting carrier dispersion and scattering dynamics to real-space features with atomic resolution. We observe quasiparticle interference in the strongly Rashba split 2DEG-like surface band found at the tellurium termination of BiTeBr and examine two mechanisms governing quasiparticle scattering: We confirm the suppression of spin-flip scattering by comparing measured quasiparticle interference with a spin-dependent elastic scattering model applied to the calculated spectral function. We also use atomically resolved STM maps to identify point defect lattice sites and spectro-microscopy imaging to discern their varying scattering strengths, which we understand in terms of the calculated orbital characteristics of the surface band. Defects on the Bi sublattice cause the strongest scattering of the predominantly Bi 6p derived surface band, with other defects causing nearly no scattering near the conduction band minimum.

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Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI

Abstract: We show experimental and theoretical evidence that BiTeI hosts a novel disordered metallic

Cited by 4 publications

References 40 publications

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂

Quasiparticle Scattering in the Rashba Semiconductor BiTeBr: The Roles of Spin and Defect Lattice Site

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Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI

Abstract: We show experimental and theoretical evidence that BiTeI hosts a novel disordered metallic

Cited by 4 publications

References 40 publications

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal Td‐MoTe2

Quasiparticle Scattering in the Rashba Semiconductor BiTeBr: The Roles of Spin and Defect Lattice Site

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Origin of the Anomalous Electrical Transport Behavior in Fe‐Intercalated Weyl Semimetal T_d‐MoTe₂