Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer 
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Nagler, Philipp; Ballottin, Mariana V.; Mitioglu, Anatolie; Durnev, M. V.; Taniguchi, Takashi; Watanabe, Kenji; Chernikov, Alexey; Schüller, Christian; Glazov, M. M.; Christianen, Peter C. M.; Korn, Tobias

doi:10.1103/physrevlett.121.057402

Cited by 88 publications

(96 citation statements)

References 54 publications

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“…This determination is also supported by the quantitative analysis of the Zeeman splitting [16][17][18][19]28,[35][36][37][38] . The valley-Zeeman splitting can be expressed as:…”

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confidence: 57%

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Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Wang

et al. 2019

Nano Lett.

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Spin-forbidden intravalley dark exciton in tungsten-based transition metal dichalcogenides (TMDCs), owing to its unique spin texture and long lifetime, has attracted intense research interest. Here, we show that we can control the dark exciton electrostatically by dressing it with one free electron or free hole, forming the dark trions. The existence of the dark trions is suggested by the unique magneto-photoluminescence spectroscopy pattern of the boron nitride (BN) encapsulated monolayer WSe2 device at low temperature. The unambiguous evidence of the dark trions is further obtained by directly resolving the radiation pattern of the dark trions through back focal plane imaging. The dark trions possess binding energy of ~ 15 meV, and they inherit the long lifetime and large g-factor from the dark exciton. Interestingly, under the out-of-plane magnetic field, dressing the dark exciton with one free electron or hole results in distinctively different valley polarization of the emitted photon, a result of the different intervalley scattering mechanism for the electron and hole. Finally, the lifetime of the positive dark trion can be further tuned from ~ 50 ps to ~ 215 ps by controlling the gate voltage. The gate tunable dark trions ushers in new opportunities for excitonic optoelectronics and valleytronics.

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“…This determination is also supported by the quantitative analysis of the Zeeman splitting [16][17][18][19]28,[35][36][37][38] . The valley-Zeeman splitting can be expressed as:…”

Section: Main Textmentioning

confidence: 57%

“…As shown in Fig. 5b, at the gate voltage of -2 V, the lifetime of X D + (~ 90 ps) is more than 10 times longer than that of X + (~ 5 ps), which confirms that the positive dark trion inherits the long lifetime from the dark exciton 20,22,25,37 . The lifetime of the dark trion is also a sensitive function of the gate voltage.…”

Section: Main Textmentioning

confidence: 59%

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Wang

et al. 2019

Nano Lett.

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“…2b), and it is determined to be 6.3 meV in our monolayer WS0.6Se1.4 encapsulated with BN flakes. The splitting of the two trions has been reported to be 6-7 meV in WSe2 39,55,56 and around 6 meV in WS2 57 (also see SI). The similar splitting magnitude suggests similar exchange interaction in the monolayer alloy WS2xSe2(1-x) to that in WSe2 or WS2.…”

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confidence: 88%

Excitonic Complexes and Emerging Interlayer Electron–Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS_0.6Se_1.4

Meng

Wang

et al. 2018

Nano Lett.

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Monolayer transition metal dichalcogenides (TMDs) possess superior optical properties, including the valley degree of freedom that can be accessed through the excitation light of certain helicity. While WS2 and WSe2 are known for their excellent valley polarization due to the strong spin-orbit coupling, the optical bandgap is limited by the ability to choose from only these two materials. This limitation can be overcome through the monolayer alloy semiconductor, WS2xSe2(1-x), which promises an atomically thin semiconductor with tunable bandgap. In this work, we show that the high-quality BN encapsulated monolayer WS0.6Se1.4 inherits the superior optical properties of tungsten-based TMDs, including a trion splitting of ~ 6 meV and valley polarization as high as ~60%. In particular, we demonstrate for the first time the emerging and gate-tunable interlayer electron-phonon coupling in the BN/WS0.6Se1.4/BN van der Waals heterostructure, which renders the otherwise optically silent Raman modes visible. In addition, the emerging Raman signals can be drastically enhanced by the resonant coupling to the 2s state of the monolayer WS0.6Se1.4 A exciton. The BN/WS2xSe2(1-x)/BN van der Waals heterostructure with a tunable bandgap thus provides an exciting platform for exploring the valley degree of freedom and emerging excitonic physics in two-dimension.

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“…The chosen spectral regions are scaled for clarity. Typically for S-TMDs monolayers, the most pronounced emission feature seen in our spectra is due to the 1s excitonic resonance accompanied by low energy peaks commonly assigned to different excitonic complexes23,[27][28][29][30][31][32][33][34][35][36][37][38] .…”

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Energy Spectrum of Two-Dimensional Excitons in a Nonuniform Dielectric Medium

et al. 2019

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We demonstrate that, in monolayers (MLs) of semiconducting transition metal dichalcogenides, the s-type Rydberg series of excitonic states follows a simple energy ladder: ǫn = −Ry * /(n + δ) 2 , n=1,2,. . . , in which Ry * is very close to the Rydberg energy scaled by the dielectric constant of the medium surrounding the ML and by the reduced effective electron-hole mass, whereas the ML polarizability is only accounted for by δ. This is justified by the analysis of experimental data on excitonic resonances, as extracted from magneto-optical measurements of a high-quality WSe2 ML encapsulated in hexagonal boron nitride (hBN), and well reproduced with an analytically solvable Schrödinger equation when approximating the electron-hole potential in the form of a modified Kratzer potential. Applying our convention to other, MoSe2, WS2, MoS2 MLs encapsulated in hBN, we estimate an apparent magnitude of δ for each of the studied structures. Intriguingly, δ is found to be close to zero for WSe2 as well as for MoS2 monolayers, what implies that the energy ladder of excitonic states in these two-dimensional structures resembles that of Rydberg states of a three-dimensional hydrogen atom.

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Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2

Cited by 88 publications

References 54 publications

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Excitonic Complexes and Emerging Interlayer Electron–Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS_0.6Se_1.4

Energy Spectrum of Two-Dimensional Excitons in a Nonuniform Dielectric Medium

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Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2

Cited by 88 publications

References 54 publications

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe2

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe2

Excitonic Complexes and Emerging Interlayer Electron–Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4

Energy Spectrum of Two-Dimensional Excitons in a Nonuniform Dielectric Medium

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Product

Resources

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Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe₂

Excitonic Complexes and Emerging Interlayer Electron–Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS_0.6Se_1.4