Intrinsic 1[Formula: see text] phase induced in atomically thin 2H-MoTe(2) by a single terahertz pulse.
Intrinsic 1[Formula: see text] phase induced in atomically thin 2H-MoTe(2) by a single terahertz pulse.
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DOI：
10.1038/s41467-023-41291-w
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发表时间：
2023-09-22
影响因子：
16.6
通讯作者：
Nelson KA
中科院分区：
文献类型：
--
作者：
Shi J;Bie YQ;Zong A;Fang S;Chen W;Han J;Cao Z;Zhang Y;Taniguchi T;Watanabe K;Fu X;Bulović V;Kaxiras E;Baldini E;Jarillo-Herrero P;Nelson KA
从2H到1-MoTe2的多晶转变被认为是由高能光子辐照和许多其他手段诱导的，由于电性能的显着改善，其在纳米级晶体管中的技术相关性已经得到了广泛的研究。然而，晶体1相是否产生仍然存在争议，因为这种假定转变的光学特征被发现与碲团簇的形成有关。在这里，我们展示了用单场增强太赫兹脉冲照射单层或多层2H-MoTe2后产生的本征1晶格。与光脉冲不同，低太赫兹光子能量限制了可能的结构破坏。我们进一步开发了一种单次太赫兹泵浦次谐波探针技术，并揭示了光激发后10 ns内2h相的跃迁。我们的研究结果不仅为解决长期以来关于MoTe2光诱导多晶转变的争论提供了重要的见解，而且还突出了强场太赫兹脉冲在操纵量子材料方面的独特能力。利用单场增强太赫兹脉冲从少量H-MoTe2晶体中产生1-MoTe2，为超快多晶转变动力学提供了见解，并解决了长期以来关于通过高能光子照射实现这种转变的争论。
The polymorphic transition from 2H to 1-MoTe2, which was thought to be induced by high-energy photon irradiation among many other means, has been intensely studied for its technological relevance in nanoscale transistors due to the remarkable improvement in electrical performance. However, it remains controversial whether a crystalline 1 phase is produced because optical signatures of this putative transition are found to be associated with the formation of tellurium clusters instead. Here we demonstrate the creation of an intrinsic 1 lattice after irradiating a mono- or few-layer 2H-MoTe2 with a single field-enhanced terahertz pulse. Unlike optical pulses, the low terahertz photon energy limits possible structural damages. We further develop a single-shot terahertz-pump-second-harmonic-probe technique and reveal a transition out of the 2H-phase within 10 ns after photoexcitation. Our results not only provide important insights to resolve the long-standing debate over the light-induced polymorphic transition in MoTe2 but also highlight the unique capability of strong-field terahertz pulses in manipulating quantum materials. A single field-enhanced terahertz pulse was used to create 1-MoTe2 out of few-layer H-MoTe2 crystals, providing insights into the ultrafast polymorphic transition dynamics and resolving a long-standing debate over the realization of this transition by high-energy photon irradiation.
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影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
6.3
作者：
Mostofi, Arash A.;Yates, Jonathan R.;Marzari, Nicola
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影响因子：
8.6
作者：
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通讯作者：
Averitt, Richard D.