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首页> 外文期刊>Journal of Applied Physics >Hyperbolic plasmon-phonon dispersion and tunable spontaneous emission enhancement in Ge_2Sb_2Te_5-based multilayer graphene and hBN system
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Hyperbolic plasmon-phonon dispersion and tunable spontaneous emission enhancement in Ge_2Sb_2Te_5-based multilayer graphene and hBN system

机译：基于GE_2SB_2TE_5的多层石墨烯和HBN系统中的双曲旋转镜头色散和可调谐自发发射增强

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摘要

Active tunability of phonon dispersion and spontaneous emission (SE) still remain open owing to its exciting application potential. In this study, multilayer graphene and hexagonal boron nitride (hBN) combined with the Ge_2Sb_2Te_5 (GST) functional substrate are proposed to obtain tunable hyperbolic plasmon-phonon dispersion and SE. Results indicate that GST phase change has a profound impact on hyperbolic phonon polaritons in the hBN layer and can obtain an actively tunable SE. Moreover, when graphene is introduced into the hBN/GST system, hyperbolic plasmon-phonon polaritons inside the two reststrahlen (RS) bands of hBN and surface plasmon-phonon polaritons outside the two RS bands can be achieved, both of which can be actively tuned by adjusting the GST phase state and graphene chemical potential. In addition, the coupled polariton branches between hBN phonon polaritons and graphene plasmons become stronger and corresponding SE enhancement regions obviously broaden with increasing the graphene/hBN layer numbers for the fixed thickness multilayer graphene/hBN on GST substrate. These characteristics may provide an available route to realize active tunability of both phonon dispersion and SE enhancement of natural or artificial hyperbolic materials.
机译：由于其令人兴奋的应用潜力，主动调谐和自发发射（SE）仍然保持开放。在该研究中，提出了与GE_2SB_2TE_5（GST）功能基板组合的多层石墨烯和六边形氮化硼（HBN）以获得可调谐双曲血位 - 声子分散和SE。结果表明，GST相变对HBN层中的双曲声子极化子产生深远的影响，并且可以获得可接受可调谐的SE。此外，当石墨烯被引入HBN / GST系统中时，可以实现两个RESTRAHLEN（RS）频带内的双曲线偏移 - 声子极化子，并且可以实现两个RS频带外部的HBN和表面等离子体 - 声子谱的波形，这两者都可以主动调整通过调节GST相位状态和石墨烯化学势。另外，HBN源极偏振子和石墨烯等离子体之间的耦合的极性抗体变得更强，并且相应的SE增强区随着GST衬底上的固定厚度多层石墨烯/ HBN的石墨烯/ HBN层数而明显宽泛。这些特性可以提供可用的途径来实现声子分散和天然或人工双曲线材料的主动可调性。

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  • 来源
    《Journal of Applied Physics》 |2021年第9期|093102.1-093102.8|共8页
  • 作者

    Kun Zhou; Lu Lu; Bowen Li; Qiang Cheng;

  • 作者单位

    School of Safety Engineering China University of Mining and Technology Xuzhou 221116 China State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China;

    State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China;

    State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China;

    State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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