Tunable exciton valley-pseudospin orders in moiré superlattices

Xiong, Richen; Brantly, Samuel L.; Su, Kaixiang; Nie, Jacob H.; Zhang, Zihan; Banerjee, Rounak; Ruddick, Hayley; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Seth Ariel; Xu, Cenke; Jin, Chenhao

doi:10.1038/s41467-024-48725-z

Tunable exciton valley-pseudospin orders in moiré superlattices

Journal Article · Sat May 18 04:00:00 EDT 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-48725-z· OSTI ID:2471803

Xiong, Richen ^[1]; Brantly, Samuel L. ^[2]; Su, Kaixiang ^[2]; Nie, Jacob H. ^[2]; Zhang, Zihan ^[2]; ^[3]; Ruddick, Hayley ^[3]; ^[4]; ^[4]; ^[3]; Xu, Cenke ^[2]; ^[2]

University of California at Santa Barbara, CA (United States); OSTI
University of California at Santa Barbara, CA (United States)
Arizona State University, Tempe, AZ (United States)
National Institute for Materials Science, Tsukuba (Japan)

Excitons in two-dimensional (2D) semiconductors have offered an attractive platform for optoelectronic and valleytronic devices. Further realizations of correlated phases of excitons promise device concepts not possible in the single particle picture. Here we report tunable exciton “spin” orders in WSe₂/WS₂ moiré superlattices. We find evidence of an in-plane (xy) order of exciton “spin”—here, valley pseudospin—around exciton filling v_ex = 1, which strongly suppresses the out-of-plane “spin” polarization. Upon increasing v_ex or applying a small magnetic field of ~10 mT, it transitions into an out-of-plane ferromagnetic (FM-z) spin order that spontaneously enhances the “spin” polarization, i.e., the circular helicity of emission light is higher than the excitation. The phase diagram is qualitatively captured by a spin-1/2 Bose–Hubbard model and is distinct from the fermion case. Our study paves the way for engineering exotic phases of matter from correlated spinor bosons, opening the door to a host of unconventional quantum devices.

View Accepted Manuscript (DOE)

Research Organization:: Arizona State University, Tempe, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); Q-AMASE-i; JSPS KAKENHI

Grant/Contract Number:: SC0020653

OSTI ID:: 2471803

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Tunable exciton valley-pseudospin orders in moiré superlattices

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