Optical properties of massive anisotropic tilted Dirac systems

Mojarro, M. A.; Carrillo-Bastos, Ramon; Maytorena, Jesús A.

doi:10.1103/physrevb.103.165415

Cited by 42 publications

(19 citation statements)

References 70 publications

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“…It may also be possible to further direct the propagation of valley carriers across graphene-based interconnects based on electrostatic waveguides [39,40], quantum wire leads [41] or gated junctions in externally applied fields [42]. Furthermore, the spatial separation of valley carriers in gapless tilted Dirac cone materials could be combined with valley-sensitive components of gapped Dirac cone materials such as valley transistors [43] or decoding the valley index via emission of circularly polarized light [1,2,7]. This would require a detailed understanding of the transport phenomena occurring at the interface between gapless and gapped Dirac cone materials.…”

Section: Discussionmentioning

confidence: 99%

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Optical absorption in two-dimensional materials with tilted Dirac cones

2022

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Two-dimensional semimetals with tilted Dirac cones in the electronic band structure are shown to exhibit spatial separation of carriers belonging to different valleys under illumination. In stark contrast to gapped Dirac materials this optovalleytronic phenomenon occurs in systems with intact inversion and time-reversal symmetry that host massless Dirac cones in the band structure, thereby retaining the exceptional graphene-like transport properties. As a result we demonstrate that optical valley separation is possible at arbitrarily low photon frequencies including the deep infrared and terahertz regimes with full gate tunability via Pauli blocking. As a specific example of our theory, we demonstrate tunable valley separation in the proposed two-dimensional tilted Dirac cone semimetal 8-P mmn borophene for incident infrared photons at room temperature.

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Section: Discussionmentioning

confidence: 99%

“…The spatial separation of valley carriers results in unequal valley populations at opposite sides of the light spot. This effect can be detected by measuring the degree of circular polarization of the edge luminescence in a nearby gapped material [1,2,7], which ideally could be the same material with locally broken inversion symmetry.…”

Section: Introductionmentioning

confidence: 99%

Optical absorption in two-dimensional materials with tilted Dirac cones

2022

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“…Very recently, a plasmonic gain was reported in current-biased tilted Dirac nodes 77 . Their optical conductivity and other properties have also been investigated thoroughly 66 , 78 . In addition, other monolayer materials with a similar tilted band structure, e.g.…”

Section: Introductionmentioning

confidence: 99%

Floquet engineering of tilted and gapped Dirac bandstructure in 1T$$^\prime$$-MoS$$_2$$

Iurov

Zhemchuzhna

Gumbs

et al. 2022

Sci Rep

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We have developed a rigorous theoretical formalism for Floquet engineering, investigating, and subsequently tailoring most crucial electronic properties of 1T$$^\prime$$ ′ -MoS$$_2$$ 2 by applying an external high-frequency dressing field within the off-resonance regime. It was recently demonstrated that monolayer semiconducting 1T$$^\prime$$ ′ -MoS$$_2$$ 2 exhibits tunable and gapped spin- and valley-polarized tilted Dirac bands. The electron-photon dressed states depend strongly on the polarization of the applied irradiation and reflect a full complexity of the low-energy Hamiltonian for non-irradiated material. We have calculated and analyzed the properties of the electron dressed states corresponding to linear and circular polarization of a dressing field by focusing on their symmetry, anisotropy, tilting, direct and indirect band gaps. Circularly polarized dressing field is known for transition into a new electronic state with broken time-reversal symmetry and a non-zero Chern number, and therefore, the combination of these topologically non-trivial phases and transitions between them could reveal some truly unique and previously unknown phenomena and applications. We have also computed and discussed the density of states for various types of 1T$$^\prime$$ ′ -MoS$$_2$$ 2 materials and its modification in the presence of a dressing field.

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“…[59][60][61][62][63] Very recently, a plasmonic gain was reported in current-biased tilted Dirac nodes 64 Their optical properties and optical conductivity have been also thoroughly investigated. 53,65 Other monolayer materials with similar tilted band structure, such as TaIrTe 4 , TaCoTe 2 or α − SnS 2 have been recently synthesized.…”

Section: Introductionmentioning

confidence: 99%