Quantum Phase Transitions of Trilayer Excitons in Atomically Thin Heterostructures

Slobodkin, Yevgeny; Mazuz-Harpaz, Yotam; Refaely-Abramson, Sivan; Gazit, Snir; Steinberg, Hadar; Rapaport, Ronen

doi:10.1103/physrevlett.125.255301

Cited by 31 publications

(32 citation statements)

References 53 publications

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“…Moreover they are stable against collapse and ultracold chemical reactions at high densities, which are shortcomings for experiments with dipolar molecules [12][13][14]. Recent studies of TMD systems [62] have shown the rich many-body physics, which is induced by the nature of quadrupolar interactions. Besides, quadrupoles play an essential role in astrophysical objects in ultrastrong magnetic fields, e.g., on the surface of neutron stars [63].…”

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confidence: 99%

“…Our predictions can be probed in experiments with TMD systems and ultracold gases, where the technique for the observation of roton phenomena recently has been developed. Promising candidates for the creation of such phases are quadrupolar excitons in TMD layer structures [55,62], where the quantum phase transition for the two-component systems has been observed [62], and Rydberg atomic ensembles.…”

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confidence: 99%

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Quantum phase transition of a two-dimensional quadrupolar system

et al. 2021

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Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusion Monte Carlo technique. We predict a quantum phase transition from a gas to a solid phase. The Lindemann ratio and the condensate fraction at the transition point are γ = 0.269(4) and n0/n = 0.031(4), correspondingly. We observe the strong rotonization of the collective excitation branch in the vicinity of the phase transition point. Our results can be probed using state-of-the-art experimental systems of various nature, such as quasi-two-dimensional systems of quadrupolar excitons in transition metal dichalcogenide (TMD) tri-layers, quadrupolar molecules, and excitons or Rydberg atoms with quadrupole moments induced by strong magnetic fields.

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Quantum phase transition of a two-dimensional quadrupolar system

et al. 2021

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“…The transfer rate at different temperatures is nearly the same by double exponential fitting (summarized in Table S1, Supporting Information), but the transfer ratio of the interlayer exciton in bilayer WS 2 –WSe 2 decreases as temperature goes down. For tri‐layer HSs, the strong interaction between two interlayer excitons can form trions [ 45 ] or quadrupole states [ 46 ] as the previous reports. The untransfer interlayer exciton could be due to the formation of these kinds of many‐body states with small binding energy in MoS 2 –WSe 2 –WS 2 .…”

Section: Resultsmentioning

confidence: 86%

Dexter‐Type Exciton Transfer in van der Waals Heterostructures

Zheng

Wang

et al. 2022

Adv Funct Materials

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Van der Waals (vdW) heterostructures (HSs) built on 2D materials provide an ideal platform for research of energy migration at the nanoscale. However, the underlying charge transfer mechanism in type II vdW HSs is still not well understood. Here, ultrafast exciton dynamics are investigated in trilayer-WS 2 -MoS 2 -WSe 2 and trilayer-MoS 2 -WSe 2 -WS 2 HSs by broadband pump-probe spectroscopy. A two-step process of exciton transfer in trilayer-WS 2 -MoS 2 -WSe 2 is directly observed when the band edge exciton of WSe 2 is excited. The electrons in WSe 2 are initially transferred to the high lying electronic state of MoS 2 -WS 2 on a time scale of tens of femtoseconds, and then electrons eventually relax into the conduction band minimum of MoS 2 within 1 ps. Furthermore, the transfer of interlayer excitons is observed for the first time in trilayer-MoS 2 -WSe 2 -WS 2 . Both transfer processes can be better understood by the Dexter charge exchange model. Due to the nature of Dexter type transfer that the exchange rate exponentially depends on the donor−acceptor distance, the interlayer exciton transfer rate is nearly a hundred times slower than that of exciton transition in bilayer HSs. The results deepen the understanding of charge transfer in 2D vdW HSs and also indicate that the exciton effect and orbital hybridization make HS a strong coupling system.

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“…The number of quantum wells and organic layers in a unit cell defines the order of the HOIP. (12)(13)(14)(15)(16) Different from exciton property of individual materials, stacking two semiconducting materials such as TMDC heterostructure, (17)(18)(19) TMDC/organic, (20)(21)(22) TMDC/perovskite QDs (23)(24)(25) and TMDC/HOIP (26)(27)(28)(29) hybrid structure or even trilayer heterostructures (30,31) results in the formation of charge-transfer excitons or interlayer excitons which exhibits long-lived states with their dipole moment (out-of-plane) different from their in-plane dipole moment.…”

Section: Introduction To Excitonic Materialsmentioning

confidence: 99%

Exciton–Photonics: From Fundamental Science to Applications

Anantharaman

Jariwala

2021

ACS Nano

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Semiconductors in all dimensionalities ranging from 0D quantum dots and molecules to 3D bulk crystals support bound electron-hole pair quasiparticles termed as excitons. Over the past two decades, the emergence of a variety of low-dimensional semiconductors that support excitons combined with advances in nano-optics and photonics has burgeoned a new area of research that focuses on engineering, imaging, and modulating coupling between excitons and photons, resulting in the formation of hybrid-quasiparticles termed exciton-polaritons. This new area has the potential to bring about a paradigm shift in quantum optics, as well as classical optoelectronic devices. Here, we present a review on the coupling of light in excitonic semiconductors and investigation of the unique properties of these hybrid quasiparticles via both farfield and near-field imaging and spectroscopy techniques. Special emphasis is laid on recent advances with critical evaluation of the bottlenecks that plague various materials towards practical device implementations including quantum light sources.Our review highlights a growing need for excitonic materials development together with optical engineering and imaging techniques to harness the utility of excitons and their host materials for a variety of applications.

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Quantum Phase Transitions of Trilayer Excitons in Atomically Thin Heterostructures

Cited by 31 publications

References 53 publications

Quantum phase transition of a two-dimensional quadrupolar system

Quantum phase transition of a two-dimensional quadrupolar system

Dexter‐Type Exciton Transfer in van der Waals Heterostructures

Exciton–Photonics: From Fundamental Science to Applications

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