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arXiv 2103.12948cond-mat.str-elcond-mat.mtrl-sci
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单层1 T- NbSe2作为二维相关磁绝缘体

Monolayer 1T-NbSe2 as a 2D correlated magnetic insulator

Mengke Liu, Joshua Leveillee, Shuangzan Lu, Jia Yu, Hyunsue Kim, Keji Lai, Chendong Zhang, Feliciano Giustino, Chih-Kang Shih

摘要:

单层V族过渡金属二硫属化物在其1 T相最近出现作为一个平台,以研究丰富的物质相,如自旋液体和铁磁性,导致强电子相关。虽然1 T相NbSe 2不会自然地以块体形式出现,但是已经发现,当通过分子束外延(MBE)生长单层NbSe 2时,1 T和1H相可以共存。这一发现激发了理论研究,预测集体现象,如二维铁磁性。在这里,通过控制MBE生长参数,我们证明了单相1 T-NbSe 2的成功生长。通过结合扫描隧道显微镜/光谱和从头计算,我们表明,该系统是一个电荷转移绝缘体,与上哈伯德带位于价带最大值以上。此外,通过创建一个垂直的1 T/2 H NbSe 2异质结,我们发现的证据之间的交换相互作用的本地磁矩在1 T相和金属/超导相,表现为近藤共振和Yu-Shiba-Rusinov束缚态。

英文摘要:

Monolayer group-V transition metal dichalcogenides in their 1T phase have recently emerged as a platform to investigate rich phases of matter, such as spin liquid and ferromagnetism, resulting from strong electron correlations. Although 1T phase NbSe2 does not occur naturally in bulk form, it has been discovered that the 1T and 1H phases can coexist when monolayer NbSe2 is grown via molecular beam epitaxy (MBE). This discovery has inspired theoretical investigations predicting collective phenomena such as ferromagnetism in two dimensions. Here, by controlling the MBE growth parameters, we demonstrate the successful growth of single-phase 1T-NbSe2. By combining scanning tunneling microscopy/spectroscopy and ab initio calculations, we show that this system is a charge-transfer insulator, with the upper Hubbard band located above the valence band maximum. Furthermore, by creating a vertical 1T/2H NbSe2 heterostructure, we find evidence of exchange interactions between the localized magnetic moments in 1T phase and the metallic/superconducting phase, as manifested by Kondo resonances and Yu-Shiba-Rusinov bound states.

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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