Large-gap insulating dimer ground state in monolayer IrTe2
Monolayers of two-dimensional van der Waals materials exhibit novel electronic phases distinct from their bulk due to the symmetry breaking and reduced screening in the absence of the interlayer coupling. In this work, we combine angle-resolved photoemission spectroscopy and scanning tunneling micro...
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| creator | Hwang, Jinwoong Kim, Kyoo Zhang, Canxun Zhu, Tiancong Herbig, Charlotte Kim, Sooran Kim, Bongjae Zhong, Yong Mohamed, Salah El-Desoky, Mohamed M Hwang, Choongyu Shen, Zhi-Xun Crommie, Michael F Sung-Kwan, Mo |
| description | Monolayers of two-dimensional van der Waals materials exhibit novel electronic phases distinct from their bulk due to the symmetry breaking and reduced screening in the absence of the interlayer coupling. In this work, we combine angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy to demonstrate the emergence of a unique insulating 2 x 1 dimer ground state in monolayer 1T-IrTe2 that has a large band gap in contrast to the metallic bilayer-to-bulk forms of this material. First-principles calculations reveal that phonon and charge instabilities as well as local bond formation collectively enhance and stabilize a charge-ordered ground state. Our findings provide important insights into the subtle balance of interactions having similar energy scales that occurs in the absence of strong interlayer coupling, which offers new opportunities to engineer the properties of 2D monolayers. |
| doi_str_mv | 10.48550/arxiv.2203.16769 |
| format | Article |
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| subjects | Bilayers Broken symmetry Coupling Dimers First principles Ground state Interlayers Monolayers Photoelectric emission Physics - Materials Science Scanning tunneling microscopy Spectroscopy Spectrum analysis |
| title | Large-gap insulating dimer ground state in monolayer IrTe2 |
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