Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mi>NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Arguello, Carlos; Rosenthal, Ethan; Andrade, Erick; Jin, Wencan; Yeh, Po Chun; Zaki, Nader; Jia, Shuang; Cava, R. J.; Fernandes, Rafael M.; Millis, Andrew J.; Valla, T.; Osgood, Richard M.; Pasupathy, Abhay

doi:10.1103/physrevlett.114.037001

Cited by 80 publications

(52 citation statements)

References 34 publications

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“…Real-space interference patterns and their Fourier transforms will show intensity only at values of q allowed by the band structure at each energy. [64][65][66] Additional selection rules that govern the relative intensities for different q can exist due to crystal and time-reversal symmetry conservation laws, 63 structure of the scattering potential, 66,67 or matrix elements. In our experiments, we consider the impurities giving rise to scattering processes to be largely nonmagnetic, as observed for other transition-metal dichalcogenides.…”

Section: Resultsmentioning

confidence: 99%

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Temperature-driven topological transition in 1T'-MoTe2

et al. 2018

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The topology of Weyl semimetals requires the existence of unique surface states. Surface states have been visualized in spectroscopy measurements, but their connection to the topological character of the material remains largely unexplored. 1T'-MoTe 2 , presents a unique opportunity to study this connection. This material undergoes a phase transition at 240 K that changes the structure from orthorhombic (putative Weyl semimetal) to monoclinic (trivial metal), while largely maintaining its bulk electronic structure. Here, we show from temperature-dependent quasiparticle interference measurements that this structural transition also acts as a topological switch for surface states in 1T'-MoTe 2 . At low temperature, we observe strong quasiparticle scattering, consistent with theoretical predictions and photoemission measurements for the surface states in this material. In contrast, measurements performed at room temperature show the complete absence of the scattering wavevectors associated with the trivial surface states. These distinct quasiparticle scattering behaviors show that 1T'-MoTe 2 is ideal for separating topological and trivial electronic phenomena via temperature-dependent measurements.

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Section: Resultsmentioning

confidence: 99%

“…In our experiments, we consider the impurities giving rise to scattering processes to be largely nonmagnetic, as observed for other transition-metal dichalcogenides. 66 To compute the expected QPI pattern at every energy, we calculate the spin-conserved scattering probability…”

Section: Resultsmentioning

confidence: 99%

Temperature-driven topological transition in 1T'-MoTe2

et al. 2018

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“…Among metallic TMDs, the stacked trigonal prismatic structure of niobium diselenide (2H-NbSe 2 ) is one of the most studied materials and an ideal system to study phase transitions as functions of temperature and dopings. It has been known for a long time 32,33 that threedimensional stacking structure of 2H-NbSe 2 is metallic at room temperature and undergoes a CDW transition at 33 K before becoming a superconductor 34,35 at 7.2 K although there has been the controversy regarding on the origin of CDW and the competition between CDW and superconducting (SC) states 32,33,[36][37][38][39][40][41][42][43][44][45] . After a few earlier attempts to investigate physical properties of its thin flakes 1,46,47 , a couple of recent works have reported successful isolations of its single layer form on top of various substrates and measure their CDW and SC phase transitions [27][28][29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle energy bands and Fermi surfaces of monolayer NbSe2

Kim

Son

2017

Phys. Rev. B

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A quasiparticle band structure of a single layer 2H-NbSe2 is reported by using first-principles GW calculation. We show that a self-energy correction increases the width of a partially occupied band and alters its Fermi surface shape when comparing those using conventional mean-field calculation methods. Owing to a broken inversion symmetry in the trigonal prismatic single layer structure, the spin-orbit interaction is included and its impact on the Fermi surface and quasiparticle energy bands are discussed. We also calculate the doping dependent static susceptibilities from the band structures obtained by the mean-field calculation as well as GW calculation with and without spinorbit interactions. A complete tight-binding model is constructed within the three-band third nearest neighbour hoppings and is shown to reproduce our GW quasiparticle energy bands and Fermi surface very well. Considering variations of the Fermi surface shapes depending on self-energy corrections and spin-orbit interactions, we discuss the formations of charge density wave (CDW) with different dielectric environments and their implications on recent controversial experimental results on CDW transition temperatures.

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“…In this line of thinking, it is only natural to recognize the essential role of phonon-electron coupling in the formation of CDW order, as suggested by several authors [30,32]. This idea has been explicitly tested in quasi-2D materials both theoretically [29,[33][34][35][36] and experimentally [36][37][38], and has proved quite successful in explaining the q cdw that deviates from q n . In quasi-1D materials, the importance of phonon-electron coupling relative to that of FSN has remained largely untested, as the good agreement between q n and q cdw in 1D cases might appear to render such tests unnecessary.…”

Section: Introductionmentioning

confidence: 99%

Charge density waves and phonon-electron coupling inZrTe3

Zheng

Ren

et al. 2015

Phys. Rev. B

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Charge-density-wave (CDW) order has long been interpreted as arising from a Fermi-surface instability in the parent metallic phase. While phonon-electron coupling has been suggested to influence the formation of CDW order in quasi-two-dimensional (quasi-2D) systems, the presumed dominant importance of Fermi-surface nesting remains largely unquestioned in quasi-1D systems.Here we show that phonon-electron coupling is also important for the CDW formation in a model quasi-1D system ZrTe 3 . Our joint experimental and computational study reveals that particular lattice vibrational patterns possess exceedingly strong coupling to the conduction electrons, and are directly linked to the lattice distortions associated with the CDW order. The dependence of the coupling matrix elements on electron momentum further dictates the opening of (partial) electronic gaps in the CDW phase. Since lattice distortions and electronic gaps are the defining signatures of CDW order, our result demonstrates that the conventional wisdom based on Fermisurface geometry needs to be substantially supplemented by phonon-electron coupling even in the simplest quasi-1D case. As prerequisites for the CDW formation, the highly anisotropic electronic structure and strong phonon-electron coupling in ZrTe 3 give rise to a distinct Raman scattering effect, namely, measured phonon linewidths depend on the direction of momentum transfer in the scattering process.

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Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in2H−NbSe2

Cited by 80 publications

References 34 publications

Temperature-driven topological transition in 1T'-MoTe2

Temperature-driven topological transition in 1T'-MoTe2

Quasiparticle energy bands and Fermi surfaces of monolayer NbSe2

Charge density waves and phonon-electron coupling inZrTe3

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