Charge Density Waves in Electron-Doped Molybdenum Disulfide.

Charge Density Waves in Electron-Doped Molybdenum Disulfide.
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DOI:
10.1021/acs.nanolett.1c00677
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发表时间:
2021-07-14
期刊:
影响因子:
10.8
通讯作者:
Schofield SR
Schofield SR
中科院分区:
材料科学1区
文献类型:
--
作者:
Bin Subhan MK;Suleman A;Moore G;Phu P;Hoesch M;Kurebayashi H;Howard CA;Schofield SR

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我们在重电子掺杂的二硫化钼(MoS2)中发现了电荷密度波(CDW)基态。这是在任何d2(第6列)过渡金属二硫化物(TMD)中首次观察到CDW。MoS2的能带结构与之前观察到的CDW的d0和d1 tmd不同,有助于对CDW的形成有新的认识。我们展示了85 K下的金属-绝缘体跃迁,费米能级上25 meV的间隙,以及两种不同的CDW调制,(2√3 × 2√3)R30°和2 × 2,分别归因于费米表面嵌套(FSN)和电子-声子耦合(EPC)。在CDW基态的观测中,FSN和EPC CDW调制的同时显示是独一无二的,我们在带折叠的背景下讨论了这一点。我们的观察结果为解决围绕tmd中CDW调制起源的争议提供了一条途径。
We present the discovery of a charge density wave (CDW) ground state in heavily electron-doped molybdenum disulfide (MoS2). This is the first observation of a CDW in any d2 (column 6) transition metal dichalcogenide (TMD). The band structure of MoS2 is distinct from the d0 and d1 TMDs in which CDWs have been previously observed, facilitating new insight into CDW formation. We demonstrate a metal–insulator transition at 85 K, a 25 meV gap at the Fermi level, and two distinct CDW modulations, (2√3 × 2√3) R30° and 2 × 2, attributable to Fermi surface nesting (FSN) and electron–phonon coupling (EPC), respectively. This simultaneous exhibition of FSN and EPC CDW modulations is unique among observations of CDW ground states, and we discuss this in the context of band folding. Our observations provide a route toward the resolution of controversies surrounding the origin of CDW modulations in TMDs.
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