Interlayer exciton complexes in bilayer MoS2

Yanchong Zhao, Luojun Du, Shiqi Yang, Jinpeng Tian, Xiaomei Li, Cheng Shen, Jian Tang, Yanbang Chu, Kenji Watanabe, Takashi Taniguchi, Rong Yang, Dongxia Shi, Zhipei Sun, Yu Ye, Wei Yang, Guangyu Zhang

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

25 Lataukset (Pure)

Abstrakti

Atomically thin transition metal dichalcogenides can show a rich variety of bound exciton complex states, such as trions, biexcitons, Fermi polarons, and phonon replicas, because of the reduced dielectric screening and enhanced Coulomb interaction. To date, studies have mainly focused on the complexes of intralayer excitons, while the electrically tunable interlayer exciton (IX) complexes remain elusive. Here, we report the observation of IX complexes with large out-of-plane electric dipole, strong emission intensity, and giant valley responses in bilayer MoS2, through on-resonance photoluminescence spectroscopy. In sharp contrast to the small, positive circular dichroism of intralayer excitons, the circular polarization of IX complexes in bilayer MoS2 can basically reach the theoretical limit (100%) but is negative. Such highly unusual light-valley responses of IX complexes in bilayer MoS2 demonstrate the strongly suppressed valley depolarization and spin-preserving scattering of electrons during the formation. Remarkably, by breaking the time-reversal symmetry with an out-of-plane magnetic field, a record level of spontaneous valley polarization (7.7%/Tesla) is identified for IX complexes in bilayer MoS2. The giant valley polarization of IX complexes in bilayer MoS2, together with the feasibility of electrical/optical/magnetic control, provides a firm basis for the development of next-generation electronic and optoelectronic applications with valley functionalities.

AlkuperäiskieliEnglanti
ArtikkeliL041411
JulkaisuPhysical Review B
Vuosikerta105
Numero4
DOI - pysyväislinkit
TilaJulkaistu - 15 tammik. 2022
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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