Topological piezoelectric response in moiré graphene systems

Peng, Ran; Liu, Jianpeng

doi:10.1103/physrevresearch.4.l032006

Cited by 3 publications

(5 citation statements)

References 66 publications

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“…进一步地, 实验在交错转角三层石墨烯中观测到了超出泡利极限的非常规超导态 [73][74][75][76] 等新奇现象. 受启发于这些新颖的实验现象, 可以进一步把前面的讨论推广到交错转角多层石墨烯体系(ATMG) [80] .…”

Section: 普适转角多层石墨烯和交错转角多层石墨烯能带结构的普适手性分解规则unclassified

“…而在氮化硼-石墨烯-氮化硼莫尔异质结中观测到了关联绝缘态 [77] , 在氮化硼-三层石墨烯莫尔异质结中, 也观测到了关联绝缘态 [78] 和量子反常霍尔效应 [79] . 总而言之, 非平子结构特征 [55,80] . 而且, 转角石墨烯体系中具有非零谷陈数的拓扑平带能够带来接近量子化的拓扑压电响应, 可以用来定量地测量莫尔石墨烯中平带的谷陈数 [81] .…”

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Novel electrical properties of moiré graphene systems

Zhang¹,

Xie²,

Peng³

et al. 2023

Acta Phys. Sin.

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In this review, we discuss the electronic structures, topological properties, correlated states, nonlinear optical responses, as well as phonon and electron-phonon coupling effects of moiré graphene superlattices. First, we illustrate that topologically non-trivial flat bands and moiré orbital magnetism are ubiquitous in various twisted graphene systems. In particular, the topological flat bands of magic-angle twisted bilayer graphene (TBG) can be explained from a zeroth pseudo-Landau-level picture, which can naturally explain the experimentally observed quantum anomalous Hall effect and some of the other correlated states. These topologically nontrivial flat bands may lead to nearly quantized piezoelectric response, which can be used to directly probe the valley Chern numbers in these moiré graphene systems. A simple and general chiral decomposition rule is reviewed and discussed, which can be used to predict the low-energy band dispersions of generic twisted mulilayer graphene system and alternating twisted multilayer graphene system. This review further discusses nontrivial interaction effects of magic-angle TBG such as the correlated insulator states, density wave states, cascade transitions, and nematic states, and proposes nonlinear optical measurement as an experimental probe to distinguish the different "featureless" correlated states.The phonon properties and electron-phonon coupling effects are also briefly reviewed. The novel physics emerging from band-aligned graphene-insulator heterostructres is also discussed in this review. In the end, we make a summary and an outlook about the novel physical properties of moiré superlattices, two-dimensional materials, moiré superlattices－ two dimensional materials.

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Section: 普适转角多层石墨烯和交错转角多层石墨烯能带结构的普适手性分解规则unclassified

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Novel electrical properties of moiré graphene systems

Zhang¹,

Xie²,

Peng³

et al. 2023

Acta Phys. Sin.

Self Cite

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“…The study of piezoelectric properties is not limited to this class of quantum materials. The piezoelectric response has recently been investigated in materials such as graphene [15] and in phononic topological plates [16]. On the other hand, experimental evidence has been presented that demonstrates the coexistence of piezoelectric and topological properties in InX monolayers (X = Se and Te) [17].…”

Section: Introductionmentioning

confidence: 99%

Bleustein-Gulyaev waves in topological piezoelectric crystals

Rojas Vallecilla,

Granada Echeverri

2024

Mater. Res. Express

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A topological insulator with piezoelectric properties is considered, and an action is proposed to find the equations of motion and the constitutive relations of the generalized coordinates of electrodynamic and elastic origin, paying special attention to the restructuring induced by the topological properties. The results are used to demonstrate that the electromechanical factor of the Bleustein-Gulyaev waves on the surface of a topological piezoelectric crystal of class C6v in contact with vacuum undergoes a second-order correction in the fine structure constant, associated with the topological properties.

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“…In this case, the electrostriction effect is a typical example. [10][11][12][13] Currently, the research in this field has been mainly focused on type-I coupling, [14][15][16][17][18][19] while type-II coupling is rather scarce, although it is promising for novel device applications. 20 The emergence of two-dimensional (2D) materials provides an unprecedented opportunity for exploring electro-mechanical coupling by considering their rich structural and electronic properties.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the electrostriction effect is a typical example. 10–13 Currently, the research in this field has been mainly focused on type-I coupling, 14–19 while type-II coupling is rather scarce, although it is promising for novel device applications. 20…”

Section: Introductionmentioning

confidence: 99%