Universal scattering response across the type-II Weyl semimetal phase diagram

Rüßmann, Philipp; Weber, A. P.; Glott, Florian; Xu, Nan; Fanciulli, Mauro; Muff, Stefanie; Magrez, Arnaud; Bugnon, Philippe; Berger, H.; Bode, Matthias; Dil, J. Hugo; Blügel, Stefan; Mavropoulos, Phivos; Sessi, Paolo

doi:10.1103/physrevb.97.075106

Cited by 20 publications

(33 citation statements)

References 64 publications

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“…No evidence of mixed (001) and (001) terminations [23,34] was found in our samples [47]. ARPES and quasiparticle interference results were consistent with only one termination type [28]. Fig.…”

supporting

confidence: 60%

“…Small arcs are buried within the HPs and a large arc appears in the gap between the HPs and EPs. The large arc persists in 1T'-MoTe 2 [24] and in the absence of WPs in WTe 2 [28,35], reinforcing the fact that Fermi arcs provide insufficient (although necessary) evidence of a WSP [40]. Quasiparticle scattering of the Fermi arcs is strongly affected by the structural transition [29], however, this scattering occurs as a function of spin-texture and nesting conditions rather than being directly related to the WSP [28].…”

mentioning

confidence: 98%

“…However, the electronic structure of 1T'-MoTe 2 (T > T S ) observed in photoemission spectroscopy appears much the same as that of T d -MoTe 2 (T << T S ) [24], although the decay of photoexcited states is clearly affected (likely due to loss of the WSP) [25]. Different reports on T d -MoTe 2 favor the case of zero (trivial semimetal) [26], four [14,[27][28][29], or eight [23,[30][31][32][33][34] Weyl points (WPs) in the Brillouin zone (BZ) at locations ranging from approximately 5 [33] to 55 meV [28] above the Fermi energy E F . The WPs impose subtle constraints on surface Fermi arc dispersions in (Mo/W)Te 2 systems [23,35,36], which have been taken as experimental signatures of the WSP [23,24,27,[29][30][31][32][33][34][35][36][37][38][39].…”

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confidence: 99%

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Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Weber

Rüßmann

et al. 2018

Phys. Rev. Lett.

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The semimetal MoTe2 is studied by spin-and angle-resolved photoemission spectroscopy to probe the detailed electronic structure underlying its broad range of response behavior. A novel spin-texture is uncovered in the bulk Fermi surface of the non-centrosymmetric structural phase that is consistent with first-principles calculations. The spin-texture is three-dimensional, both in terms of momentum dependence and spin-orientation, and is not completely suppressed above the centrosymmetry-breaking transition temperature. Two types of surface Fermi arc are found to persist well above the transition temperature. The appearance of a large Fermi arc depends strongly on thermal history, and the electron quasiparticle lifetimes are greatly enhanced in the initial cooling. The results indicate that polar instability with strong electron-lattice interactions exists near the surface when the bulk is largely in a centrosymmetric phase.

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confidence: 60%

mentioning

confidence: 98%

mentioning

confidence: 99%

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Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Weber

Rüßmann

et al. 2018

Phys. Rev. Lett.

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“…The primary candidates for type II Weyl semimetal are MoTe 2 and WTe 2 with much theoretical and experimental studies devoted to both, a review of which goes far beyond the scope of this work. Although there are several reports of conflicting conclusions, even partly by the same authors, the general consensus now appears to be that MoTe 2 most likely is a type II WSM whereas WTe 2 probably is not 15,110,120 , and that for WP 2 the case is still open 122 .…”

Section: Sarpes On Topological (Semi)metalsmentioning

confidence: 99%

Spin- and angle-resolved photoemission on topological materials

Dil

2019

Electron. Struct.

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A historical review of spin-and angle-resolved photoemission on topological materials is presented, aimed at readers who are new to the field or who wish to obtain an overview of the activities in the field. The main focus lies on topological insulators, but also Weyl and other semimetals will be discussed. Further it will be explained why the measured spin polarisation from a spin polarised state should always add up to 100% and how spin interference effects influence the measured spin texture.

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“…Since the linear dispersion around the WPs can be described by the Weyl Hamiltonian involving all three Pauli matrices, small perturbations do not lift the energy degeneracy but only displace the WPs in momentum space. Besides fundamental properties such as the massless and chiral nature of the bulk carriers and large carrier mobility [20,21], WSM states also exhibit unusual transport phenomena like the quantum anomalous Hall effect [22], large positive magnetoresistance [23], Klein tunnelling [24,25], chiral anomaly [26,27] and novel quantum oscillations [28,29]. These exotic features and inherent robustness against disorder make WSMs promising candidate for future generation nanoelectronics, spintronics [30] and valleytronics [31] devices.…”

Section: Introductionmentioning

confidence: 99%

Realization of Weyl semimetal phases in topoelectrical circuits

et al. 2020

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In this work, we demonstrate a simple and effective method to design and realize various Weyl semimetal (WSM) states in a three-dimensional periodic circuit lattice composed of passive electric circuit elements such as inductors and capacitors (LC). The experimental accessibility of such LC circuits offers a ready platform for the realization of not only various WSM phases but also for exploring transport properties in topological systems. The characteristics of such LC circuits are described by the circuit admittance matrices, which are mathematically related to the Hamiltonian of the quantum tight-binding model. The system can be switched between the Type-I and Type-II WSM phases simply by an appropriate choice of inductive or capacitive coupling between certain nodes. A peculiar phase with a flat admittance band emerges at the transition between the Type-I and Type-II Weyl phases. Impedance resonances occur in the LC circuits at certain frequencies associated with vanishing eigenvalues of the admittance matrix. The impedance readout can be used to classify the Type-I and Type-II WSM states. A Type-I WSM shows impedance peaks only at the Weyl points (WPs) whereas a Type-II WSM exhibits multiple secondary peaks near the WPs. This impedance behaviour reflects the vanishing and non-vanishing density of states at the Weyl nodes in the Type-I and Type-II WSM phases, respectively.

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Universal scattering response across the type-II Weyl semimetal phase diagram

Cited by 20 publications

References 64 publications

Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Spin- and angle-resolved photoemission on topological materials

Realization of Weyl semimetal phases in topoelectrical circuits

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