Evidence of the nontrivial Berry phase at ?-Al2O3/SrTiO3 heterointerfaces

Niu, Wei1,2; Wu, Zhenqi1,2; Chen, Yongda3; Gan, Yulin4; Chen, Yequan3; Hu, Hongqi1,2; Zhang, Xiaoqian5; Xu, Yongbing1,2,3; Zou, Youming6; Pu, Yong1,2; Wang, Xuefeng3

2022-09-05

10.1063/5.0093903

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

The nontrivial Berry phase in correlated oxide heterostructures has been highly attractive due to the Rashba spin-orbit interactions originating from the inversion symmetry breaking at the heterointerfaces. Despite the theoretically predicated nontrivial pi Berry phase in Rashba systems, its experimental detection among all Rashba oxide interfaces remains elusive. Here, we report a nontrivial Berry phase at the interface between gamma-Al2O3 and SrTiO3 as evidenced by the quantum oscillations. Analysis of transport properties under the high magnetic field up to 32 T reveals the weak anti-localization (WAL) effect and Shubnikov-de Haas (SdH) oscillations. Both the WAL effect and the nontrivial pi Berry phase extracted from the SdH oscillations manifest the significance of the Rashba spin-orbit coupling in gamma-Al2O3/SrTiO3. Physical quantities concerning the Fermi surface, such as effective mass, scattering time, etc., are experimentally accessed as well. Our work provides insights into the nontrivial Berry phase in correlated oxide interfaces.

SCI

英语

NI论文

其他

National Natural Science Foundation of China["11904174","11874203","61822403","61874060","U1932159","61911530220"] ; Natural Science Foundation of Jiangsu Province["BK20190729","BK20181388"] ; NUPTSF[NY220203] ; Natural Science Foundation of Universities of Jiangsu Province[TJ219008] ; China Postdoctoral Science Foundation["2020M680726","2022T150287","2021M701590"]

Physics

Physics, Applied

WOS:000852574000003

AIP Publishing

PHYSICS

Web of Science

1.Nanjing Univ Posts & Telecommun, New Energy Technol Engn Lab Jiangsu Prov, Nanjing 210023, Peoples R China
2.Nanjing Univ Posts & Telecommun, Sch Sci, Nanjing 210023, Peoples R China
3.Nanjing Univ, Sch Elect Sci & Engn, Jiangsu Prov Key Lab Adv Photon & Elect Mat, Nanjing 210093, Peoples R China
4.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme C, High Magnet Field Lab, HFIPS, Hefei 230031, Peoples R China

Niu, Wei,Wu, Zhenqi,Chen, Yongda,et al. Evidence of the nontrivial Berry phase at ?-Al2O3/SrTiO3 heterointerfaces[J]. APPLIED PHYSICS LETTERS,2022,121(10).

Niu, Wei.,Wu, Zhenqi.,Chen, Yongda.,Gan, Yulin.,Chen, Yequan.,...&Wang, Xuefeng.(2022).Evidence of the nontrivial Berry phase at ?-Al2O3/SrTiO3 heterointerfaces.APPLIED PHYSICS LETTERS,121(10).

Niu, Wei,et al."Evidence of the nontrivial Berry phase at ?-Al2O3/SrTiO3 heterointerfaces".APPLIED PHYSICS LETTERS 121.10(2022).