Chiral charge density wave and backscattering-immune orbital texture in monolayer 1T-TiTe2
| Autor: | Ren, Mingqiang, Cheng, Fangjun, Zhao, Yufei, Gu, Mingqiang, Cheng, Qiangjun, Yan, Binghai, Liu, Qihang, Ma, Xucun, Xue, Qikun, Song, Can-Li |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Nano Letters (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acs.nanolett.3c03692 |
| Popis: | Non-trivial electronic states are attracting intense attention in low-dimensional physics. Though chirality has been identified in charge states with a scalar order parameter, its intertwining with charge density waves (CDW), film thickness and the impact on the electronic behaviors remain less well understood. Here, using scanning tunneling microscopy, we report a 2 x 2 chiral CDW as well as a strong suppression of the Te-5p hole-band backscattering in monolayer 1T-TiTe2. These exotic characters vanish in bilayer TiTe2 with a non-CDW state. Theoretical calculations approve that chirality comes from a helical stacking of the triple-q CDW components and therefore can persist at the two-dimensional limit. Furthermore, the chirality renders the Te-5p bands an unconventional orbital texture that prohibits electron backscattering. Our study establishes TiTe2 as a promising playground for manipulating the chiral ground states at the monolayer limit and provides a novel path to engineer electronic properties from an orbital degree. Comment: 21 pages, 5 figures |
| Databáze: | arXiv |
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