Robust Coupling between Structural and Electronic Transitions in a Mott Material

Kalcheim, Yoav; Butakov, Nikita A.; Vargas, Nicolás M.; Lee, Min‐Han; Valle, Javier del; Trastoy, Juan; Salev, Pavel; Schuller, Jon A.; Schuller, Iván K.

doi:10.1103/physrevlett.122.057601

Cited by 67 publications

(84 citation statements)

References 55 publications

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“…4, we extract the volume fraction of the rutile metallic phase based on the responses at 529 eV and 530.5 eV independently and assuming that only the rutile phase is generated, in a similar approach to Ref. [13]. In Fig.…”

Section: Electronic and Structural Changes At Thresholdmentioning

confidence: 99%

“…This can occur even in the comparatively simple case of equilibrium measurements. For instance, comparing near-field imaging and x-ray diffraction methods gave rise to the claim that the electronic and structural phase transitions in the related vanadium compound V 2 O 3 are decoupled in temperature [12], while later measurements showed this to be an artifact arising from comparing techniques [13]. The equilibrium transition is similarly controversial for VO 2 , where approaches that combine different techniques have suggested that the equilibrium transitions can be decoupled [14], while techniques that can probe both aspects of the phase transition simultaneously show they are not [15].…”

Section: Introductionmentioning

confidence: 99%

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Does Vo2 Host a Transient Monoclinic Metallic Phase?

et al. 2020

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Ultrafast phase transitions induced by femtosecond light pulses present a new opportunity for manipulating the properties of materials. Understanding how these transient states are different from, or similar to, their thermal counterparts is key to determining how materials can exhibit properties that are not found in equilibrium. In this paper, we reexamine the case of the light-induced insulator-metal phase transition in the prototypical, strongly correlated material VO 2 , for which a nonthermal Mott-Hubbard transition has been claimed. Here, we show that heat, even on the ultrafast timescale, plays a key role in the phase transition. When heating is properly accounted for, we find a single phase-transition threshold corresponding to the thermodynamic structural insulator-metal phase transition, and we find no evidence of a hidden transient Mott-Hubbard nonthermal phase. The interplay between the initial thermal state and the ultrafast transition may have implications for other transient states of matter.

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Section: Electronic and Structural Changes At Thresholdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Does Vo2 Host a Transient Monoclinic Metallic Phase?

et al. 2020

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“…Various mechanisms have been investigated and employed to realize tunable nanophotonic and metasurface platforms. These include the transition from nematic to isotropic phases in liquid crystals [31], [32], amorphous to crystalline phase change in GeSbTe (GST) [54], [76], [77] and metal─insulator transitions (MIT) in prototypical strongly correlated materials such as vanadium dioxide (VO 2 ) [67], [78]- [82] and V 2 O 3 [83], [84].…”

Section: Phase Transition Materialsmentioning

confidence: 99%

Thermally Reconfigurable Meta-Optics

et al. 2019

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Metasurfaces are two-dimensional nanostructures that allow unprecedented control of light through engineering the amplitude, phase, and polarization across meta-atom resonators. Adding tunability to metasurface components would boost their potential and unlock a vast array of new application possibilities such as dynamic beam steering, tunable metalenses, and reconfigurable meta-holograms, to name a few. We present here high-index meta-atoms, resonators, and metasurfaces reconfigured by thermal effects, across the near to mid-infrared spectral ranges. We study thermal tunability in group IV and group IV-VI semiconductors, as well as in phase-transition materials, and demonstrate large dynamic resonance frequency shifts accompanied by significant amplitude and phase modulation in metasurfaces and resonators. We highlight the importance of high-Q resonances along with peak performance of thermal and thermo-optic effects, for efficient and practical reconfigurable devices. This paper paves the way to efficient high-Q reconfigurable and active infrared metadevices.

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“…The strong coupling effects between the degree of freedom of charge, spin, and lattice determine the IMT behaviors of VO 2 . However, it is disputed whether electron correlation (Mott transition) or electron–phonon interaction (Peierls transition) triggers such IMT . Distinguishing SPT and IMT also remains a challenge in VO 2 .…”

Section: Introductionmentioning

confidence: 99%

Strained VO₂ Nanostructure Thin Films with an Unaffected Insulator–Metal Transition

Huang

Wang

Wei

et al. 2020

Physica Status Solidi (b)

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Insulator–metal transition (IMT) brings some fantastic physical changes and accompanies structure phase transition (SPT) in correlated vanadium dioxide (VO2) materials. It is still in dispute whether the electron–phonon interaction induced by the lattice deformation or the electron–electron correlation drives the IMT transition. An alternative and challenging way to understand the mechanism is to separate SPT from IMT in VO2. Understanding and manipulating strain and defect in VO2 is important to regulate the IMT behavior. Herein, strained VO2 nanostructure thin films with unaffected IMT behavior are presented. The shifted phonon modes and the decreased interplanar spacing indicate the presence of the in‐plane strain in VO2 nanostructure thin films. Such structural strains do not affect the transition temperature but provide a platform for the light modulation. It is believed that the unaffected IMT is beneficial for in‐depth understanding of the IMT and SPT behaviors in VO2 and even the creation of advanced electronic devices.

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Robust Coupling between Structural and Electronic Transitions in a Mott Material

Cited by 67 publications

References 55 publications

Does Vo2 Host a Transient Monoclinic Metallic Phase?

Does Vo2 Host a Transient Monoclinic Metallic Phase?

Thermally Reconfigurable Meta-Optics

Strained VO₂ Nanostructure Thin Films with an Unaffected Insulator–Metal Transition

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Robust Coupling between Structural and Electronic Transitions in a Mott Material

Cited by 67 publications

References 55 publications

Does Vo2 Host a Transient Monoclinic Metallic Phase?

Does Vo2 Host a Transient Monoclinic Metallic Phase?

Thermally Reconfigurable Meta-Optics

Strained VO2 Nanostructure Thin Films with an Unaffected Insulator–Metal Transition

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Product

Resources

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Strained VO₂ Nanostructure Thin Films with an Unaffected Insulator–Metal Transition