Liu, L., Zhang, S., Chu, Y., Shen, C., Huang, Y., Yuan, Y., Tian, J., Tang, J., Ji, Y., Yang, R., Watanabe, K., Taniguchi, T., Shi, D., Liu, J., Yang, W., & Zhang, G. (2022). Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene. Nature Communications, 13(1), Article 3292. https://doi.org/10.1038/s41467-022-30998-x
Liu, Le ; Zhang, Shihao ; Chu, Yanbang et al. / Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene. In: Nature Communications. 2022 ; Vol. 13, No. 1.
@article{4e26f2af5e2d477a97c4a916ed4a9daf,
title = "Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene",
abstract = "New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. Here, we report an observation of new correlated insulators evolved from spin-polarized states to valley-polarized states in twisted double bilayer graphene (TDBG) driven by the displacement field (D). At a high field |D | > 0.7 V/nm, we observe valley polarized correlated insulators with a big Zeeman g factor of ~10, both at v = 2 in the moir{\'e} conduction band and more surprisingly at v = −2 in the moir{\'e} valence band. Moreover, we observe a valley polarized Chern insulator with C = 2 emanating at v = 2 in the electron side and a valley polarized Fermi surface around v = −2 in the hole side. Our results demonstrate a feasible way to realize isospin control and to obtain new phases of matter in TDBG by the displacement field, and might benefit other twisted or non-twisted multilayer systems.",
author = "Le Liu and Shihao Zhang and Yanbang Chu and Cheng Shen and Yuan Huang and Yalong Yuan and Jinpeng Tian and Jian Tang and Yiru Ji and Rong Yang and Kenji Watanabe and Takashi Taniguchi and Dongxia Shi and Jianpeng Liu and Wei Yang and Guangyu Zhang",
note = "Publisher Copyright: {\textcopyright} 2022, The Author(s).",
year = "2022",
month = dec,
doi = "10.1038/s41467-022-30998-x",
language = "English",
volume = "13",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}
Liu, L, Zhang, S, Chu, Y, Shen, C, Huang, Y, Yuan, Y, Tian, J, Tang, J, Ji, Y, Yang, R, Watanabe, K, Taniguchi, T, Shi, D, Liu, J, Yang, W & Zhang, G 2022, 'Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene', Nature Communications, vol. 13, no. 1, 3292. https://doi.org/10.1038/s41467-022-30998-x
Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene. / Liu, Le; Zhang, Shihao; Chu, Yanbang et al.
In:
Nature Communications, Vol. 13, No. 1, 3292, 12.2022.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene
AU - Liu, Le
AU - Zhang, Shihao
AU - Chu, Yanbang
AU - Shen, Cheng
AU - Huang, Yuan
AU - Yuan, Yalong
AU - Tian, Jinpeng
AU - Tang, Jian
AU - Ji, Yiru
AU - Yang, Rong
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Shi, Dongxia
AU - Liu, Jianpeng
AU - Yang, Wei
AU - Zhang, Guangyu
N1 - Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. Here, we report an observation of new correlated insulators evolved from spin-polarized states to valley-polarized states in twisted double bilayer graphene (TDBG) driven by the displacement field (D). At a high field |D | > 0.7 V/nm, we observe valley polarized correlated insulators with a big Zeeman g factor of ~10, both at v = 2 in the moiré conduction band and more surprisingly at v = −2 in the moiré valence band. Moreover, we observe a valley polarized Chern insulator with C = 2 emanating at v = 2 in the electron side and a valley polarized Fermi surface around v = −2 in the hole side. Our results demonstrate a feasible way to realize isospin control and to obtain new phases of matter in TDBG by the displacement field, and might benefit other twisted or non-twisted multilayer systems.
AB - New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. Here, we report an observation of new correlated insulators evolved from spin-polarized states to valley-polarized states in twisted double bilayer graphene (TDBG) driven by the displacement field (D). At a high field |D | > 0.7 V/nm, we observe valley polarized correlated insulators with a big Zeeman g factor of ~10, both at v = 2 in the moiré conduction band and more surprisingly at v = −2 in the moiré valence band. Moreover, we observe a valley polarized Chern insulator with C = 2 emanating at v = 2 in the electron side and a valley polarized Fermi surface around v = −2 in the hole side. Our results demonstrate a feasible way to realize isospin control and to obtain new phases of matter in TDBG by the displacement field, and might benefit other twisted or non-twisted multilayer systems.
UR - http://www.scopus.com/inward/record.url?scp=85131474030&partnerID=8YFLogxK
U2 - 10.1038/s41467-022-30998-x
DO - 10.1038/s41467-022-30998-x
M3 - Article
C2 - 35672329
AN - SCOPUS:85131474030
SN - 2041-1723
VL - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 3292
ER -
Liu L, Zhang S, Chu Y, Shen C, Huang Y, Yuan Y et al. Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene. Nature Communications. 2022 Dec;13(1):3292. doi: 10.1038/s41467-022-30998-x
