Large conduction band and Fermi velocity spin splitting due to Coulomb interactions in single-layer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Ferreirós, Yago; Cortijo, Alberto

doi:10.1103/physrevb.90.195426

Cited by 10 publications

(13 citation statements)

References 30 publications

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“…Furthermore, detailed magneto-transmission experiments have revealed that the reduced mass of the exciton in monolayer MoS 2 is heavier than predicted by density functional theories [28,34], suggesting a large electron mass consistent with recent values determined from transport studies of n-type MoS 2 monolayers [35]. The complicated interplay of band structure [28,36], electron-electron interactions [11,24,37,38], enhanced spin-splitting [39], dynamical effects [40] and inter-/ intra-valley phonon [41] and plasmon [20] contributions makes MoS 2 one of the most challenging materials to understand.…”

Section: Introductionsupporting

confidence: 72%

Fine structure of negatively charged and neutral excitons in monolayer MoS$_{2}$

Jadczak,

Kutrowska-Girzycka,

Bieniek

et al. 2020

Preprint

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We present results of optical experiments and theoretical analysis on the high-quality single-layer MoS 2 which reveal the fine structure of charged excitons, i.e., trions. In the emission spectra we resolve and identify two trion peaks, T 1 and T 2 , resembling the pair of singlet and triplet trion peaks (T S and T T ) in tungsten-based materials. However, in polarization-dependent photoluminescence measurements we identify these peaks as intra-and inter-valley singlet trions due to the trion fine structure distinct from that already known in bright and dark 2D materials with large conduction-band splitting induced by the spin-orbit coupling. We show that the trion energy splitting in MoS 2 is a sensitive probe of inter-and intra-valley carrier interaction. With additional support from theory we claim that the existence of these singlet trions combined with an anomalous excitonic g-factor together suggest that monolayer MoS 2 has a dark excitonic ground state, despite having "bright" singleparticle arrangement of spin-polarized conduction bands.

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Section: Introductionsupporting

confidence: 72%

Fine structure of negatively charged and neutral excitons in monolayer MoS$_{2}$

Jadczak,

Kutrowska-Girzycka,

Bieniek

et al. 2020

Preprint

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“…The calculation of µ and of ∂µ/∂n is carried out by performing numerically the first and the second derivatives, respectively, of the ground-state energy, which, in turn, are known only numerically from Eqs. ( 13) and (19).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The magnetic properties of MoS 2 nanoribbons indicate that the electron-electron interactions are not negligible. Furthermore, the effect of Coulomb interactions on the low-energy band structure of MoS 2 using an effective two-band model Hamiltonian has been recently studied [19] and the study showed that a large conduction band spin splitting and a spin dependent Fermi velocity are generated due to the Coulomb interaction.…”

Section: Introductionmentioning

confidence: 99%

Charge compressibility and quantum magnetic phase transition inMoS2

Rostami

Asgari

2015

Phys. Rev. B

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We investigate the ground-state properties of monolayer MoS2 incorporating the Coulomb interaction together with a short-range intervalley interaction between charged particles between two valleys within the Hartree-Fock approximation. We consider four variables as independent parameters, namely homogeneous charge (electron or hole) density, averaged dielectric constant, spin degree of freedom and finally the Hubbard repulsion coefficient which originates mostly from 4d orbits of Mo atoms. We find the electronic charge compressibility within the mean-field approximation and show that non-monotonic behavior of the compressibility as a function of carrier density which is rather different from those of the two-dimensional electron gas. We also explore a paramagnetic-toferromagnetic quantum phase transition for the wide range of the electron density in the parameter space.

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“…Recent photoluminescence experiments in monolayer MoS 2 , MoSe 2 , WS 2 , and WSe 2 confirmed the existence of excitonic states that are localized in the band gap [16][17][18][19][20] . Furthermore, a few theoretical works pertinent to the excitonic absorption spectrum of these materials have appeared recently [21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model

2017

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The electronic and structural properties of excitons and trions in monolayer transition metal dichalcogenides are investigated using both a multi-band and a single-band model. In the multiband model we construct the excitonic Hamiltonian in the product base of the single-particle states at the conduction and valence band edges. We decouple the corresponding energy eigenvalue equation and solve the resulting differential equation self-consistently, using the finite element method (FEM), to determine the energy eigenvalues and the wave functions. As a comparison, we also consider the simple single-band model which is often used in numerical studies. We solve the energy eigenvalue equation using the FEM as well as with the stochastic variational method (SVM) in which a variational wave function is expanded in a basis of a large number of correlated Gaussians. We find good agreement between the results of both methods as well as with other theoretical works for excitons and we also compare with available experimental data. For trions the agreement between both methods is not as good due to our neglect of angular correlations when using the FEM. Finally, when comparing the two models, we see that the presence of the valence bands in the muti-band model leads to differences with the single-band model when (interband) interactions are strong.

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Large conduction band and Fermi velocity spin splitting due to Coulomb interactions in single-layerMoS2

Cited by 10 publications

References 30 publications

Fine structure of negatively charged and neutral excitons in monolayer MoS$_{2}$

Fine structure of negatively charged and neutral excitons in monolayer MoS$_{2}$

Charge compressibility and quantum magnetic phase transition inMoS2

Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model

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