Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

Lopes, Nei; Reyes, Daniel; Continentino, Mucio A.; Thomas, C.

doi:10.1103/physrevb.103.195150

Cited by 4 publications

(2 citation statements)

References 83 publications

(116 reference statements)

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“…As real materials do not exhibit perfect nesting, CDW formation is supported by either electron–phonon coupling (EPC), other collective excitations, or electron–electron interactions. − In layered materials, CDWs often exist in proximity to other ordered phases, for example, superconductivity and magnetism, due to a precarious balance between competing interactions. Approaching the two-dimensional (2D) limit enhances the potential for such interplay, while providing new knobs to tune electronic phases, such as electric fields and strain. − Notably, electron–electron interactions in the 2D limit are expected to induce competition among different CDW driving mechanisms as well as other ordered states. − In practice, however, a crossover toward electronic charge order driven by dimensional reduction remains to be discovered.…”

Section: Introductionmentioning

confidence: 99%

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂

et al. 2021

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Thinning crystalline materials to two dimensions (2D) creates a rich playground for electronic phases, including charge, spin, superconducting, and topological order. Bulk materials hosting charge density waves (CDWs), when reduced to ultrathin films, have shown CDW enhancement and tunability. However, charge order confined to only 2D remains elusive. Here we report a distinct charge ordered state emerging in the monolayer limit of 1T-VSe2. Systematic scanning tunneling microscopy experiments reveal that bilayer VSe2 largely retains the bulk electronic structure, hosting a tridirectional CDW. However, monolayer VSe2 consistently across distinct substratesexhibits a dimensional crossover, hosting two CDWs with distinct wavelengths and transition temperatures. Electronic structure calculations reveal that while one CDW is bulk-like and arises from the well-known Peierls mechanism, the other is decidedly unconventional. The observed CDW-lattice decoupling and the emergence of a flat band suggest that the second CDW could arise from enhanced electron–electron interactions in the 2D limit. These findings establish monolayer–VSe2 as a host of coexisting charge orders with distinct origins, and enable the tailoring of electronic phenomena via emergent interactions in 2D materials.

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Section: Introductionmentioning

confidence: 99%

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂

et al. 2021

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“…Approaching the two-dimensional (2D) limit enhances the potential for such interplay, by reducing the screening of electronelectron interactions [9], while providing new knobs to tune electronic phases, such as electric fields and strain [10][11][12][13]. Notably, electron-electron interactions in the 2D limit are expected to induce competition among different CDW driving mechanisms as well as other ordered states [14][15][16]. In practice, however, a crossover towards electronic charge order driven by dimensional reduction remains to be discovered.…”

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confidence: 99%

Coexisting charge-ordered states with distinct driving mechanisms in monolayer VSe$_2$

Chua,

Henke,

Saha

et al. 2021

Preprint

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Thinning crystalline materials to two dimensions (2D) creates a rich playground for electronic phases, including charge, spin, superconducting and topological order. Bulk materials hosting charge density waves (CDWs), when reduced to ultrathin films, have shown CDW enhancement and tunability. However, charge order confined to only 2D remains elusive. Here we report a distinct charge ordered state emerging in the monolayer limit of 1T-VSe2. Systematic scanning tunneling microscopy experiments reveal that bilayer VSe2 largely retains the bulk electronic structure, hosting a tri-directional CDW. However, monolayer VSe2 exhibits a dimensional crossover, hosting two CDWs with distinct wavelengths. Electronic structure calculations reveal that while one CDW is bulk-like and arises from the well-known Peierls mechanism, the other is decidedly unconventional. The observed CDW-lattice decoupling and the emergence of a flat band suggest that the new CDW arises from enhanced electron-electron interactions in the 2D limit. These findings establish monolayer-VSe2 as the first host of coexisting charge orders with distinct origins, opening the door to tailoring electronic phenomena via emergent interactions in 2D materials.

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Superconductivity and charge density wave in transition metal chalcogenides: A first principle study

Yang

Shen

et al. 2023

Physica E: Low-dimensional Systems and Nanostructures

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Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

Cited by 4 publications

References 83 publications

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂

Coexisting charge-ordered states with distinct driving mechanisms in monolayer VSe$_2$

Superconductivity and charge density wave in transition metal chalcogenides: A first principle study

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Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

Cited by 4 publications

References 83 publications

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe2

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe2

Coexisting charge-ordered states with distinct driving mechanisms in monolayer VSe$_2$

Superconductivity and charge density wave in transition metal chalcogenides: A first principle study

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Product

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Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂

Coexisting Charge-Ordered States with Distinct Driving Mechanisms in Monolayer VSe₂