On-chip valley topological materials for elastic wave manipulation

Yan, Mou; Lu, Jiuyang; Li, Feng; Deng, Weiyin; Huang, Xueqin; Ma, Jiahong; Liu, Zhengyou

doi:10.1038/s41563-018-0191-5

Cited by 295 publications

(176 citation statements)

References 52 publications

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“…Over the past few years, “valleytronics” has emerged as an area where valley, a binary degree of freedom, has a potential to be an excellent candidate of information carrier. The concept of valley has also been introduced into different kinds of physical systems, such as photonics, acoustics, and elastics . In the photonic community, researchers have found that domain walls between two types of inversion‐breaking photonic crystals, that is, valley‐Hall photonic topological insulators (PTIs), could support topologically nontrivial valley‐polarized kink states.…”

mentioning

confidence: 99%

Valley‐Hall Photonic Topological Insulators with Dual‐Band Kink States

Chen

Zhang

et al. 2019

Advanced Optical Materials

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Extensive researches have revealed that valley, a binary degree of freedom (DOF), can be an excellent candidate of information carrier. Recently, valley DOF is introduced into photonic systems, and several valley‐Hall photonic topological insulators (PTIs) are experimentally demonstrated. However, in the previous valley‐Hall PTIs, topological kink states only work at a single frequency band, which limits potential applications in multiband waveguides, filters, communications, and so on. To overcome this challenge, here a valley‐Hall PTI, where the topological kink states exist at two separated frequency bands, is experimentally demonstrated in a microwave substrate‐integrated circuitry. Both the simulated and experimental results demonstrate the dual‐band valley‐Hall topological kink states are robust against the sharp bends of the internal domain wall with negligible intervalley scattering. This work may pave the way for multichannel substrate‐integrated photonic devices with high efficiency and high capacity for information communications and processing.

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mentioning

confidence: 99%

Valley‐Hall Photonic Topological Insulators with Dual‐Band Kink States

Chen

Zhang

et al. 2019

Advanced Optical Materials

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“…If we have / a p = 2 instead, as shown in figures 6(d) and (e), we will have energy equally distributed into the two channels. To be more general, the energy distribution ratio between different channels can be efficiently controlled by tuning angles a and b [38].…”

Section: A Multiport Valve For Power Dividing and Feedingmentioning

confidence: 99%

“…Soon, people realized that similar phenomena are not restricted to quantum systems, and nontrivial topology can also bring exciting phenomena and results in classical wave systems. Recently, classical analogs of QSH and QVH insulators were predicted and verified both theoretically and experimentally in electromagnetic [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], acoustic [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], elastic [34][35][36][37][38][39][40][41][42][43], and even water surface wave systems [44]. Very recently, robust and high-capacity phononic communications were realized in the context of Lamb waves through topological edge states by multiplexing the pseudospin and valley indices [43].…”

Section: Introductionmentioning

confidence: 99%

Acoustic topological devices based on emulating and multiplexing of pseudospin and valley indices

Gao

Mei

2020

New J. Phys.

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We present a design paradigm for acoustic devices in which robust and controllable transport of wave signals can be realized. These devices are based on a simple acoustic platform, where different topological phases such as acoustic quantum spin Hall and quantum valley Hall insulators are emulated by engineering the spatial symmetries of the structure. Edge states along interfaces between different topological phases are shown to be promising information channels, where the multiplexing of pseudospin and/or valley degrees of freedom is unambiguously demonstrated in various devices including a multiport valve for acoustic power dividing and feeding. The information capacity in the input channel is substantially enhanced due to the creating of an extra dimension for the data carriers. The topological devices proposed here, when integrated with other state-of-the-art communication techniques, may suggest a significant step towards acoustic communication circuits with complex functionalities.

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“…Breaking the time‐reversal symmetry to obtain an equivalent to the quantum Hall effect in bosonic lossless systems requires active materials responding to an external field, a nonlinearity, or time‐dependent physical properties, which in the case of elasticity is especially difficult. Therefore, several proposals, as well as few experimental realizations, have achieved topological phenomena by emulating the quantum spin Hall effect or quantum valley Hall effect in passive linear structures. While conserving time‐reversal symmetry, these topological structures are based on breaking some spatial inversion symmetry.…”

Section: Prospectsmentioning

confidence: 99%

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

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The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

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On-chip valley topological materials for elastic wave manipulation

Cited by 295 publications

References 52 publications

Valley‐Hall Photonic Topological Insulators with Dual‐Band Kink States

Valley‐Hall Photonic Topological Insulators with Dual‐Band Kink States

Acoustic topological devices based on emulating and multiplexing of pseudospin and valley indices

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

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