journal article·2023-05-01Open access

Magnetic proximity effect in ultrathin freestanding WS2/LaMnO3 van der Waals heterostructures

Qinwen Lu, Xunyong Lei, Jun Fu, Qing Wang, Xiaoyu Mao, Long Cheng, Xiaofang Zhai, Hualing Zeng

AIP Advances· Volume 13· Issue 5

Abstract

With complex coupling of multiple degrees of freedom, transition metal oxides (TMOs) provide a promising platform to tune the magnetic property in heterostructures via the magnetic proximity effect. Recent realization of freestanding TMO thin films allows further extension of this technique to novel two-dimensional heterostructures by mechanically stacking with van der Waals materials. Here, we demonstrate the presence of significant magnetic exchange interactions in a heterostructure of 8 nm freestanding LaMnO3 and monolayer WS2. The high magnetization in freestanding LaMnO3 leads to valley degeneracy breaking in WS2, resulting in unbalanced valley polarization in the photoluminescence (PL). Further temperature-dependent PL measurements reveal the same transition behavior as the magnetization in the freestanding LaMnO3 film. Our results unlock new approaches for tuning the magnetism and the valley degree of freedom in ultrathin two-dimensional heterostructures.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · Multiferroics and related materials · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Technology, International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China 1 , Hefei 230026, China

Department of Physics, Chinese Academy of Sciences, Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China 2 , Hefei, Anhui 230026, China

School of Physical Science and Technology, ShanghaiTech University 3 , Pudong, Shanghai 201210, China

Funding

Ministry of Science and Technology of China · CAS Project for Young Scientists in Basic Research · National Science Foundation of China · Science and Technology Commission of Shanghai Municipality · Fundamental Research Funds for the Central Universities · Anhui Initiative in Quantum Information Technologies · ShanghaiTech Startup Fund · Double First Class Initiative Fund of ShanghaiTech University

References (33)

Show source-provided references
1. Sci. Adv. · 2017 · 3 · e160311310.1126/sciadv.1603113 ↗
2. Phys. Rev. Lett. · 2020 · 124 · 19740110.1103/physrevlett.124.197401 ↗
3. Nat. Nanotechnol. · 2020 · 15 · 18710.1038/s41565-019-0629-1 ↗
4. Phys. Rev. B · 2013 · 88 · 14443010.1103/physrevb.88.144430 ↗
5. Adv. Mater. · 2020 · 32 · 190849810.1002/adma.201908498 ↗
6. Nature · 2018 · 563 · 9410.1038/s41586-018-0626-9 ↗
7. Nat. Nanotechnol. · 2016 · 11 · 59810.1038/nnano.2016.49 ↗
8. Phys. Rev. Lett. · 2012 · 108 · 19680210.1103/physrevlett.108.196802 ↗
9. Nat. Mater. · 2013 · 12 · 20710.1038/nmat3505 ↗
10. Nat. Phys. · 2015 · 11 · 14810.1038/nphys3201 ↗
11. Nat. Nanotechnol. · 2012 · 7 · 49010.1038/nnano.2012.95 ↗
12. Nature · 1996 · 380 · 14110.1038/380141a0 ↗
13. npj Quantum Mater. · 2016 · 1 · 1602610.1038/npjquantmats.2016.26 ↗
14. Phys. Rev. Lett. · 2008 · 100 · 25720310.1103/physrevlett.100.257203 ↗
15. ACS Nano · 2017 · 11 · 1225710.1021/acsnano.7b05743 ↗
16. Adv. Mater. · 2020 · 32 · e200350110.1002/adma.202003501 ↗
17. Nat. Mater. · 2016 · 15 · 125510.1038/nmat4749 ↗
18. Sci. Adv. · 2020 · 6 · eaba584710.1126/sciadv.aba5847 ↗
19. Science · 2019 · 366 · 47510.1126/science.aay7221 ↗
20. Nature · 2019 · 570 · 8710.1038/s41586-019-1255-7 ↗
21. ACS Nano · 2022 · 16 · 758010.1021/acsnano.1c11065 ↗
22. Proc. Natl. Acad. Sci. U. S. A. · 2014 · 111 · 1160610.1073/pnas.1406960111 ↗
23. Nat. Commun. · 2016 · 7 · 1271510.1038/ncomms12715 ↗
24. Phys. Status Solidi RRL · 2015 · 9 · 45710.1002/pssr.201510224 ↗
25. Nanotechnology · 2017 · 28 · 39570210.1088/1361-6528/aa87d0 ↗
26. Nat. Commun. · 2019 · 10 · 416310.1038/s41467-019-11966-4 ↗
27. Nano Lett. · 2018 · 18 · 382310.1021/acs.nanolett.8b01105 ↗
28. Nat. Commun. · 2020 · 11 · 602110.1038/s41467-020-19816-4 ↗
29. Phys. Rev. B · 2019 · 99 · 11544110.1103/physrevb.99.115441 ↗
30. Phys. Rev. B · 2020 · 101 · 12540110.1103/physrevb.101.125401 ↗
31. Nat. Commun. · 2016 · 7 · 1256610.1038/ncomms12566 ↗
32. Science · 2015 · 349 · 71610.1126/science.aaa5198 ↗
33. Nat. Nanotechnol. · 2017 · 12 · 75710.1038/nnano.2017.68 ↗