Visualizing the charge density wave transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>2</mml:mn><mml:mi>H</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>NbSe</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:math>in real space

Arguello, Carlos; Chockalingam, S. P.; Rosenthal, Ethan; Zhao, Liuyan; Gutiérrez, Christopher; Kang, Joon Ho; Chung, Woo Chang; Fernandes, Rafael M.; Jia, Shuang; Millis, Andrew J.; Cava, R. J.; Pasupathy, Abhay

doi:10.1103/physrevb.89.235115

Cited by 156 publications

(139 citation statements)

References 32 publications

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“…Due to the non-zero amplitude, the gap in the electronic structure will survive even above the transition temperature T CDW ¼ T MMA , in the form of a pseudogap phase 4,23 . The dynamical fluctuations in this regime may become locally pinned in the presence of defects, creating islands of order up to T ¼ T RPA E300 K, in agreement with recent STM and X-ray scattering experiments 23,24 . The properties of this regime are reminiscent of the features that characterize the pseudogap phase of cuprate high-temperature superconductors 35 , which have recently been shown typically to contain charge-ordered phases of their own [28][29][30] .…”

Section: Nature Communications | Doisupporting

confidence: 87%

“…Specific similarities are the presence of a pseudogap, Fermi surface arcs, dynamical fluctuations and a corresponding sensitivity to the timescales employed by experimental probes, as well as the existence of the crossover to the normal state at T* ¼ T RPA . Note that the existence of a crossover temperature T*E300 K, between the pseudogap and disordered regimes predicted here, falls outside of the temperature range that has been probed in NbSe 2 to date 4,24 .…”

Section: Nature Communications | Doimentioning

confidence: 44%

“…In an electronically nested system, on the other hand, the nesting vector localizes any fluctuations to a single point in momentum space. The second experimental result arguing for a strongly coupled transition is the observation of a reduction of the density of states persisting well above the transition temperature, in what has been termed a pseudogap regime 4,23,24 . In strongly coupled CDW materials, a pseudogap typically appears through the presence of locally fluctuating charge order without long-range coherence 23 .…”

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confidence: 99%

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Charge order from orbital-dependent coupling evidenced by NbSe2

2015

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Niobium diselenide has long served as a prototype of two-dimensional charge ordering, believed to arise from an instability of the electronic structure analogous to the one-dimensional Peierls mechanism. Despite this, various anomalous properties have recently been identified experimentally, which cannot be explained by Peierls-like weakcoupling theories. Here, we consider instead a model with strong electron-phonon coupling, taking into account both the full momentum and orbital dependence of the coupling matrix elements. We show that both are necessary for a consistent description of the full range of experimental observations. We argue that NbSe 2 is typical in this sense, and that any chargeordered material in more than one dimension will generically be shaped by the momentum and orbital dependence of its electron-phonon coupling as well as its electronic structure. The consequences will be observable in many charge-ordered materials, including cuprate superconductors.

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Section: Nature Communications | Doisupporting

confidence: 87%

Section: Nature Communications | Doimentioning

confidence: 44%

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confidence: 99%

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Charge order from orbital-dependent coupling evidenced by NbSe2

2015

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“…Condensation of CDW by disorder has been examined in Refs. [35,36,[44][45][46][47][48][49]. Pinning of the CDW bears some similarities to pinning of the vortex lattice in superconductors [50][51][52], and is discussed using the Fukuyama-Lee-Rice theory [53,54].…”

Section: Discussionmentioning

confidence: 99%

“…However, dynamic, or fluctuating, CDWs can be pinned by disorder [36,[44][45][46]. Condensation of CDW by disorder has been examined in Refs.…”

Section: Discussionmentioning

confidence: 99%

Charge density wave in layeredLa1−xCexSb2

et al. 2015

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The layered rare-earth diantimonides RSb 2 are anisotropic metals with generally low electronic densities whose properties can be modified by substituting the rare earth. LaSb 2 is a nonmagnetic metal with a low residual resistivity presenting a low-temperature magnetoresistance that does not saturate with the magnetic field. It has been proposed that the latter can be associated to a charge density wave (CDW), but no CDW has yet been found. Here we find a kink in the resistivity above room temperature in LaSb 2 (at 355 K) and show that the kink becomes much more pronounced with substitution of La by Ce along the La 1−x Ce x Sb 2 series. We find signatures of a CDW in x-ray scattering, specific heat, and scanning tunneling microscopy (STM) experiments in particular for x ≈ 0.5. We observe a distortion of rare-earth-Sb bonds lying in-plane of the tetragonal crystal using x-ray scattering, an anomaly in the specific heat at the same temperature as the kink in resistivity and charge modulations in STM. We conclude that LaSb 2 has a CDW which is stabilized in the La 1−x Ce x Sb 2 series due to substitutional disorder.

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The 2D Semiconductor Library

Zhang

2022

Van Der Waals Heterostructures

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Visualizing the charge density wave transition in2H-NbSe2in real space

Cited by 156 publications

References 32 publications

Charge order from orbital-dependent coupling evidenced by NbSe2

Charge order from orbital-dependent coupling evidenced by NbSe2

Charge density wave in layeredLa1−xCexSb2

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