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arXiv 1808.03034cond-mat.str-elcond-mat.mtrl-sci
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单层极限下VSe2中金属-绝缘体转变和高温电荷密度波的出现

Emergence of a Metal-Insulator Transition and High Temperature Charge Density Waves in VSe2 at the Monolayer Limit

Ganbat Duvjir, Byoung Ki Choi, Iksu Jang, Søren Ulstrup, Soonmin Kang, Trinh Thi Ly, Sanghwa Kim, Young Hwan Choi, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg,… 展开作者

Ganbat Duvjir, Byoung Ki Choi, Iksu Jang, Søren Ulstrup, Soonmin Kang, Trinh Thi Ly, Sanghwa Kim, Young Hwan Choi, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Je-Geun Park, Raman Sankar, Ki-Seok Kim, Jungdae Kim, Young Jun Chang

摘要:

氧化物异质结构中电子重建驱动的涌现现象已被深入讨论。然而,这些现象在塑造范德华异质界面的电子性质的作用迄今尚未建立。通过减少材料厚度和形成异质界面,我们发现两种类型的电荷有序的石墨烯衬底上的单层VSe 2的转变。角分辨光电子能谱(ARPES)揭示了费米面嵌套在ML VSe 2中变得完美。重整化群分析证实了三维的不完美嵌套普遍地流入二维的完美嵌套。其结果是,电荷密度波转变温度显着提高到350 K的值相比,在体VSe 2的105 K。更有趣的是,ARPES和扫描隧道显微镜测量证实了一个意想不到的金属-绝缘体转变在135 K,驱动晶格畸变。异质界面在单层过渡金属二硫族化合物中起着重要的作用。

英文摘要:

Emergent phenomena driven by electronic reconstructions in oxide heterostructures have been intensively discussed. However, the role of these phenomena in shaping the electronic properties in van der Waals heterointerfaces has hitherto not been established. By reducing the material thickness and forming a heterointerface, we find two types of charge-ordering transitions in monolayer VSe2 on graphene substrates. Angle-resolved photoemission spectroscopy (ARPES) uncovers that Fermi-surface nesting becomes perfect in ML VSe2. Renormalization group analysis confirms that imperfect nesting in three dimensions universally flows into perfect nesting in two dimensions. As a result, the charge density wave transition temperature is dramatically enhanced to a value of 350 K compared to the 105 K in bulk VSe2. More interestingly, ARPES and scanning tunneling microscopy measurements confirm an unexpected metal-insulator transition at 135 K, driven by lattice distortions. The heterointerface plays an important role in driving this novel metal-insulator transition in the family of monolayered transition metal dichalcogenides.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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