Spatially indirect intervalley excitons in bilayer WSe2

dc.contributorAalto Universityen
dc.contributor.authorHuang, Zhihengen_US
dc.contributor.authorZhao, Yanchongen_US
dc.contributor.authorBo, Taoen_US
dc.contributor.authorChu, Yanbangen_US
dc.contributor.authorTian, Jinpengen_US
dc.contributor.authorLiu, Leen_US
dc.contributor.authorYuan, Yalongen_US
dc.contributor.authorWu, Fanfanen_US
dc.contributor.authorZhao, Jiaojiaoen_US
dc.contributor.authorXian, Ledeen_US
dc.contributor.authorWatanabe, Kenjien_US
dc.contributor.authorTaniguchi, Takashien_US
dc.contributor.authorYang, Rongen_US
dc.contributor.authorShi, Dongxiaen_US
dc.contributor.authorDu, Luojunen_US
dc.contributor.authorSun, Zhipeien_US
dc.contributor.authorMeng, Shengen_US
dc.contributor.authorYang, Weien_US
dc.contributor.authorZhang, Guangyuen_US
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.contributor.groupauthorZhipei Sun Groupen
dc.contributor.groupauthorCentre of Excellence in Quantum Technology, QTFen
dc.contributor.organizationCAS - Institute of Physicsen_US
dc.contributor.organizationSongshan Lake Materials Laboratoryen_US
dc.contributor.organizationNational Institute for Materials Scienceen_US
dc.description| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/965124/EU//FEMTOCHIP | openaire: EC/H2020/834742/EU//ATOP
dc.description.abstractSpatially indirect excitons with displaced wave functions of electrons and holes play a pivotal role in a large portfolio of fascinating physical phenomena and emerging optoelectronic applications, such as valleytronics, exciton spin Hall effect, excitonic integrated circuit, and high-temperature superfluidity. Here, we uncover three types of spatially indirect excitons (including their phonon replicas) and their quantum-confined Stark effects in hexagonal boron nitride encapsulated bilayer WSe2 by performing electric field-tunable photoluminescence measurements. Because of different out-of-plane electric dipole moments, the energy order between the three types of spatially indirect excitons can be switched by a vertical electric field. Remarkably, we demonstrate, assisted by first-principles calculations, that the observed spatially indirect excitons in bilayer WSe2 are also momentum indirect, involving electrons and holes from Λ and K/Γ valleys in the Brillouin zone, respectively. This is in contrast to the previously reported spatially indirect excitons with electrons and holes localized in the same valley. Furthermore, we find that the spatially indirect intervalley excitons in bilayer WSe2 can exhibit considerable, doping-sensitive circular polarization. The spatially indirect excitons with momentum-dark nature and highly tunable circular polarization may provide a firm basis for the understanding and engineering of technological applications in photonics and optoelectronics.en
dc.description.versionPeer revieweden
dc.identifier.citationHuang, Z, Zhao, Y, Bo, T, Chu, Y, Tian, J, Liu, L, Yuan, Y, Wu, F, Zhao, J, Xian, L, Watanabe, K, Taniguchi, T, Yang, R, Shi, D, Du, L, Sun, Z, Meng, S, Yang, W & Zhang, G 2022, ' Spatially indirect intervalley excitons in bilayer WSe2 ', Physical Review B, vol. 105, no. 4, L041409 .
dc.identifier.otherPURE UUID: 4f58ba17-1d88-48aa-9844-fbf83dea83f5en_US
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dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseriesVolume 105, issue 4en
dc.titleSpatially indirect intervalley excitons in bilayer WSe2en
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi