Tunable quantum criticalities in an isospin extended Hubbard model simulator

Li, Qiao; Cheng, Bin; Chen, Moyu; Xie, Bo; Xie, Yingchao; Wang, Pengfei; Chen, Fanqiang; Liu, Zenglin; Watanabe, Kenji; Taniguchi, Takashi; Liang, Shi‐Jun; Wang, Da; Wang, Chenjie; Wang, Qiang-Hua; Liu, Jianpeng; Miao, Feng

doi:10.1038/s41586-022-05106-0

Cited by 21 publications

(20 citation statements)

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“…Chiral stacked 2D materials possess exotic Moiré optics and novel electronic properties, whereby opposite stacking configurations of an identical 2D system may possess distinct topological and transport behaviors. [188,189] When two atomically thin periodic lattices are superimposed on top of each other, Moiré patterns with uniquely tunable potential landscapes emerge. Due to programmable electron localization that gives rise to artificial atoms, these Moiré 2D materials have been used as quantum simulators to probe quantum mechanical phenomena elusive to conventional materials.…”

Section: Fundamental Properties and Emergent Phenomena At The Chiral ...mentioning

confidence: 99%

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

et al. 2022

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chiral plasmonic nanoparticles and their self-assembled structures as colloidal suspensions. [6][7][8][9] Recently, beyond noble metal plasmonics, solid-state layered nanomaterials that are rotationally aligned with a defined twist angle are becoming increasingly investigated (Figure 1). Among these are twisted 2D van der Waals (vdW) materials, [10][11][12] twisted single-crystal slabs, [13,14] twisted aligned nanowire thin films, [15][16][17][18] and twisted metasurfaces with periodic subunits [19][20][21] (Figure 2). These chiral stacked materials possessing geometric handedness and optical chirality can be seen as truncated and minimalistic versions of supramolecular liquid crystals in the chiral nematic phase or of 3D chiral photonic crystals. [22][23][24] Compared to their bulk or multiple-layer counterparts, the fabrication becomes greatly simplified for bilayer or few-layer chiral metamaterials, enabling precise control over the interlayer twist angle to manipulate lightmatter interactions. Ultrathin chiral metamaterials and metasurfaces with tunable optical and chiroptical responses are thus an active field for study.Twisting achiral layered nanostructures in parallel planes enables engineering of the extrinsic chirality and related optical performance. Specifically, the twist angle from counterclockwise rotation of an upper layer with respect to the beneath one is defined to be positive, θ > 0°, leading to a left-handed stacking geometry. [10,18] Accordingly, negative twist angle from clockwise rotation gives rise to the right-handed counterpart. Accurate control over the interlayer rotation angle offers flexible manipulation of properties, especially optical activity, of twisted layered systems of a wide variety of monolayer constituents and dimensions. A well-studied system is twisted bilayer graphene (TBG), catalyzing the research on twisted stacked nanostructures over the past few years, especially as many intriguing properties of magic-angle graphene are uncovered. [28][29][30] The twist angle dependencies of phonon dispersion, [31] optical absorption and reflection, [32,33] circular dichroism (CD) and birefringence, [10,34] second harmonic generation (SHG), [35] and photoresponse [36,37] of TBG have been extensively explored in the past few years. Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [38,39] graphitic carbon nitride, [40] and hexagonal boron nitride (hBN), [41] as well as non-2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [42,43] Therefore, there exists fertile ground for chiral metasurface design Artificial chiral nanostructures have been subjected to extensive research for their unique chiroptical activities. Planarized chiral films of ultrathin thicknesses are in particular demand for easy on-chip integration and improved energy efficiency as polarization-sensitive metadevices. Recently, controlled twisted stacking of two or more layers of nanomaterials, such as 2D van der ...

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Section: Fundamental Properties and Emergent Phenomena At The Chiral ...mentioning

confidence: 99%

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

et al. 2022

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“…The other is a natural architecture formed by few-layer graphene with a rhombohedral stacking order [ 4 ]. Now, in a landmark experiment, the team led by Feng Miao at Nanjing University has ingeniously synthesized the natural and artificial architectures and, for the first time, provided compelling evidence for realizing quantum pseudo and two-stage criticalities and their in situ manipulation via electric and magnetic fields [ 5 ].…”

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confidence: 99%

“…The magic occurs when two AB bilayer graphene, the duo duo, are twisted by 0.75° over π and the second moiré band is filled in a way such that every three moiré unit cells lack one electron [ 5 ]. At large out-of-plane electric fields, the electrons ‘crystallize’ themselves and the system behaves like an insulating Wigner crystal, as revealed by its Efros–Shklovskii scaling behavior of the temperature dependence of resistance.…”

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confidence: 99%

“…These significant results [ 5 ] call for future works to further substantiate the realization of an extended Hubbard model using twisted double bilayer graphene and to enrich the understanding of the rare phases observed in it, particularly from more direct microscopy and spectroscopy studies [ 6 ]. It is a mystery why the first moiré band or other commensurate fillings do not yield strongly interacting phases.…”

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confidence: 99%

“…The existence of many more convenient tuning knobs and a greater number of unit cells will likely turn out to be another superb advantage over more established techniques that require exhaustive computation or precise control of cold atoms. Graphene-based quantum simulation has been turned on by the first generation of pioneering works including this highlighted one [ 5 ]. Stay tuned.…”

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Chemical Modulation of Metal–Insulator Transition toward Multifunctional Applications in Vanadium Dioxide Nanostructures

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The metal–insulator transition (MIT) of vanadium dioxide (VO2) has been of great interest in materials science for both fundamental understanding of strongly correlated physics and a wide range of applications in optics, thermotics, spintronics, and electronics. Due to the merits of chemical interaction with accessibility, versatility, and tunability, chemical modification provides a new perspective to regulate the MIT of VO2, endowing VO2 with exciting properties and improved functionalities. In the past few years, plenty of efforts have been devoted to exploring innovative chemical approaches for the synthesis and MIT modulation of VO2 nanostructures, greatly contributing to the understanding of electronic correlations and development of MIT‐driven functionalities. Here, this comprehensive review summarizes the recent achievements in chemical synthesis of VO2 and its MIT modulation involving hydrogen incorporation, composition engineering, surface modification, and electrochemical gating. The newly appearing phenomena, mechanism of electronic correlation, and structural instability are discussed. Furthermore, progresses related to MIT‐driven applications are presented, such as the smart window, optoelectronic detector, thermal microactuator, thermal radiation coating, spintronic device, memristive, and neuromorphic device. Finally, the challenges and prospects in future research of chemical modulation and functional applications of VO2 MIT are also provided.

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Tunable quantum criticalities in an isospin extended Hubbard model simulator

Cited by 21 publications

References 53 publications

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

Graphene supremacy: the duo duo

Chemical Modulation of Metal–Insulator Transition toward Multifunctional Applications in Vanadium Dioxide Nanostructures

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