Signatures of moiré trions in WSe2/MoSe2 heterobilayers

Liu, Erfu; Barré, Elyse; Baren, Jeremiah van; Wilson, Matthew; Taniguchi, Takashi; Watanabe, Kenji; Cui, Yong‐Tao; Gabor, Nathaniel; Heinz, Tony F.; Chang, Yia-Chung; Lui, Chun Hung

doi:10.1038/s41586-021-03541-z

Cited by 106 publications

(77 citation statements)

References 55 publications

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“…These so-called moiré excitons show distinct PL emission with valley polarization functionalities and can be fine-tuned by changing the twist angles. For example, Lui et al 478 demonstrated moiré trion in a WSe2/MoSe2 heterobilayer recently.…”

Section: Optical Emissionmentioning

confidence: 99%

Recent Progress on Two-Dimensional Materials

Chang¹,

Chen²,

Chen³

et al. 2021

Acta Physico Chimica Sinica

310

119

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Research on two-dimensional (2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications.In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief background 物理化学学报 Acta Phys. -Chim. Sin. 2021, 37 (12), 2108017 (3 of 151) introduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials (PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.

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Section: Optical Emissionmentioning

confidence: 99%

Recent Progress on Two-Dimensional Materials

Chang¹,

Chen²,

Chen³

et al. 2021

Acta Physico Chimica Sinica

310

119

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“…The recent emergence of two-dimensional transition metal dichalcogenides (TMDCs) and their van der Waals (vdW) heterostructures offers an unprecedented platform to realize spatially indirect excitons. Indeed, spatially indirect excitons have thus far been demonstrated in a wide variety of TMDC homo-and heterostructures [19], such as MoS 2 /WS 2 [25][26][27], MoS 2 /WSe 2 [28,29], MoSe 2 /WSe 2 [20,22,[30][31][32][33], and bilayer MoS 2 [7,[34][35][36][37][38][39]. Specially, owing to the strongly reduced dielectric screening, spatially indirect excitons in homo-/heterobilayers of TMDCs possess substantial binding energies and show crucial advantages for applications, for example, superfluidity at high temperature [9].…”

mentioning

confidence: 99%

“…To date, the studies of spatially indirect excitons have mainly focused on the momentum-bright species with electrons and holes localized in the same valley of the Brillouin zone (BZ) [7,[19][20][21][22][23][24][25][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. On the other hand, because of the existence of multiple electronic valleys, TMDC homoand heterobilayers can also exhibit spatially indirect excitons with momentum-dark nature (that is, electrons and holes are from different valleys of the BZ) [6,28,[43][44][45].…”

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confidence: 99%

Spatially indirect intervalley excitons in bilayer WSe2

et al. 2022

Self Cite

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Spatially 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 WSe 2 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 WSe 2 are also momentum indirect, involving electrons and holes from and K/ 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 WSe 2 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.

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“…In addition, the moiré potential in WSe 2 /MoSe 2 heterobilayers has led to the observation of trapping of interlayer excitons at specific atomic registries in the moiré lattice [31][32][33][34][35][36][37][38]. To date, hetero-bilayer WSe 2 /MoSe 2 remains the only moiré system to conclusively exhibit exciton trapping.…”

Section: Introductionmentioning

confidence: 99%

Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice

Campbell¹,

Brotons‐Gisbert²,

Baek³

et al. 2022

Preprint

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Two-dimensional moiré materials provide a highly tunable platform to investigate strongly correlated electronic states. Such emergent many-body phenomena can be optically probed in moiré systems created by stacking two layers of transition metal dichalcogenide semiconductors: optically injected excitons can interact with itinerant carriers occupying narrow moiré bands to form exciton-polarons sensitive to strong correlations. Here, we investigate the many-body interactions between excitons and a Fermi sea that is spatially pinned by the moiré superlattice of a molybdenum diselenide (MoSe2) / tungsten diselenide (WSe2) twisted hetero-bilayer. At a multitude of fractional fillings of the moiré lattice, we observe ordering of both electrons and holes into stable correlated electronic states. Magneto-optical measurements reveal extraordinary Zeeman splittings of the exciton-polarons due to exchange interactions between holes in the correlated phases, with a maximum close to the correlated state at one hole per site. The temperature dependence of the Zeeman splitting reveals antiferromagnetic ordering of the correlated holes across a wide range of fractional fillings. Our results illustrate the nature of excitons interacting with a spatially pinned Fermi sea and provide robust evidence for strongly correlated electronic states in MoSe2/WSe2 hetero-bilayers, unveiling the rich potential of this platform for investigations of Fermi-Hubbard and Bose-Hubbard physics.

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Signatures of moiré trions in WSe2/MoSe2 heterobilayers

Cited by 106 publications

References 55 publications

Recent Progress on Two-Dimensional Materials

Recent Progress on Two-Dimensional Materials

Spatially indirect intervalley excitons in bilayer WSe2

Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice

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