Unidirectional Charge Orders Induced by Oxygen Vacancies on SrTiO₃(001)

Ding, Cui1,2; Dong, Wenfeng1; Jiao, Xiaotong1; Zhang, Zhiyu1; Gong, Guanming1; Wei, Zhongxu3; Wang, Lili1,4; Jia, Jin-Feng2,3,5; Xue, Qi-Kun1,2,3,4

2024-06-01

10.1021/acsnano.4c03317

ACS NANO   影响因子和分区

1936-0851

1936-086X

The discovery of high-mobility two-dimensional electron gas and low carrier density superconductivity in multiple SrTiO3-based heterostructures has stimulated intense interest in the surface properties of SrTiO3. The recent discovery of high-T-c superconductivity in the monolayer FeSe/SrTiO3 led to the upsurge and underscored the atomic precision probe of the surface structure. By performing atomically resolved cryogenic scanning tunneling microscopy/spectroscopy characterization on dual-TiO2-delta-terminated SrTiO3(001) surfaces with (root 13 x root 13), c(4 x 2), mixed (2 x 1), and (2 x 2) reconstructions, we disclosed universally broken rotational symmetry and contrasting bias- and temperature-dependent electronic states for apical and equatorial oxygen sites. With the sequentially evolved surface reconstructions and simultaneously increasing equatorial oxygen vacancies, the surface anisotropy reduces and the work function lowers. Intriguingly, unidirectional stripe orders appear on the c(4 x 2) surface, whereas local (4 x 4) order emerges and eventually forms long-range unidirectional c(4 x 4) charge order on the (2 x 2) surface. This work reveals robust unidirectional charge orders induced by oxygen vacancies due to strong and delicate electronic-lattice interaction under broken rotational symmetry, providing insights into understanding the complex behaviors in perovskite oxide-based heterostructures.

SrTiO3(001) surface reconstruction oxygen vacancy unidirectional charge order scanningtunneling microscopy/spectroscopy work function

SCI

英语

NI期刊

通讯

National Natural Science Foundation of China["52388201","12074210","12204222"] ; National Key Research and Development Program of China[2022YFA1403102] ; Basic and Applied Basic Research Major Programme of Guangdong Province, China[2021B0301030003] ; Jihua Laboratory[X210141TL210]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001258202200001

AMER CHEMICAL SOC

Web of Science

1.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Quantum Sci Ctr, Guangdong Hongkong Macao Greater Bay Area Guangdon, Shenzhen 518045, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Frontier Sci Ctr Quantum Informat, Beijing 100084, Peoples R China
5.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

Ding, Cui,Dong, Wenfeng,Jiao, Xiaotong,et al. Unidirectional Charge Orders Induced by Oxygen Vacancies on SrTiO₃(001)[J]. ACS NANO,2024.

Ding, Cui.,Dong, Wenfeng.,Jiao, Xiaotong.,Zhang, Zhiyu.,Gong, Guanming.,...&Xue, Qi-Kun.(2024).Unidirectional Charge Orders Induced by Oxygen Vacancies on SrTiO₃(001).ACS NANO.

Ding, Cui,et al."Unidirectional Charge Orders Induced by Oxygen Vacancies on SrTiO₃(001)".ACS NANO (2024).