Optically induced Lifshitz transition in bilayer graphene

Iorsh, I. V.; Dini, K.; Shelykh, I. A.

doi:10.1103/physrevb.96.155432

Cited by 49 publications

(32 citation statements)

References 44 publications

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“…In the simplest case of a circular path of radius k (0) , the Berry phase defined in Eq. In contrast, the constant-energy cut for dispersions (26) with angular dependence (27) has an elliptic shape, as it shown in Fig. 4 (a).…”

Section: Discussionmentioning

confidence: 87%

“…[15][16][17][18][19][20][21][22] Considerable effort has been given to find a way to generate topological insulator properties in such systems under irradiation 12,23,24 Optical dressing can also alter the tunneling and conductance 25 properties of a topological insulator, leading to tunable spin transport on their surfaces 26 with potential applications in spintronics, as well as result in an optically-stimulated Lifshitz transition. 27 Another important property of such electronic dressed systems for operating an optoelectronic device is the challenge of confining such electron states in a specific region. This is directly related to the presence or absence of the so-called Klein paradox 28 in the considered material.…”

Section: Introductionmentioning

confidence: 99%

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Peculiar electronic states, symmetries, and Berry phases in irradiated α−T3 materials

2019

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We have laid out the results of a rigorous theoretical investigation into the response of electron dressed states, i.e., interacting Floquet states arising from the off-resonant coupling of Dirac spin-1 electrons in the α-T3 model, to external radiation with various polarizations. Specifically, we have examined the role played by the parameter α that is a measure of the coupling strength with the additional atom at the center of the honeycomb graphene lattice and which, when varied, continuously gives a different Berry phase. We have found that the electronic properties of the α -T3 model (consisting of a flat band and two cones) could be modified depending on the polarization of the imposed irradiation. We have demonstrated that under elliptically-polarized light the lowenergy band structure of such lattice directly depends on the valley index τ . We have obtained and analyzed the corresponding wave functions, their symmetries and the corresponding Berry phases, and revealed that such phases could be finite even for a dice lattice, which has not been observed in the absence of the dressing field. This results lead to possible radiation-generated band structure engineering, as well as experimental and technological realization of such optoelectronic devices and photonic crystals.

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Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Peculiar electronic states, symmetries, and Berry phases in irradiated α−T3 materials

2019

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“…It has been shown that laser-illuminated graphene monolayers 14,18,23,37 and bilayers [38][39][40] may host chiral edge states if the laser parameters are appropriately chosen 41 . These Floquet chiral edge states will be the 'substrate' on which we will base our proposal.…”

Section: Hamiltonian Model and Floquet Solution Schemementioning

confidence: 99%

One-way transport in laser-illuminated bilayer graphene: A Floquet isolator

2017

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We explore the Floquet band-structure and electronic transport in laser-illuminated bilayer graphene. By using a bias voltage perpendicular to the graphene bilayer we show how to get one-way charge and valley transport among two unbiased leads. In contrast to quantum pumping, our proposal uses a different mechanism based on generating a non-reciprocal bandstructure with a built-in directionality. The Floquet states at one edge of a graphene layer become hybridized with the continuum on the other layer, and so the resulting bandstructure allows for one-way transport as in an isolator. Our proof-of-concept may serve as a building block for devices exploiting one-way states.

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“…For α = λ = 0, the Hamiltonian [equation (2.7)] is similar to the bilayer graphene irradiated with circularly polarized light [35][36][37][38]. In the bilayer graphene irradiated with circularly polarized light, the light induces a term which is valley and polarization dependent.…”

Section: )mentioning

confidence: 99%

Crossover of spin Hall to quantum anomalous Hall effect in PbC/MnSe heterostructures

Chen¹

2020

Condens. Matter Phys.

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In this paper, we study topological properties and Hall conductivities in PbC/MnSe heterostructure under the illumination of a circularly polarized light. At high frequency regime, energy gap, Chern numbers, and Hall conductivities are studied based on the Floquet theory and Green's function formalism, respectively. The interplay between spin orbit coupling and light leads to topological phase transition between anomalous Hall states and spin Hall states, which is related to the emission and absorption of two virtual photons. The anomalous Hall conductivities are dependent on polarization of light, while the spin Hall conductivity is independent.

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Optically induced Lifshitz transition in bilayer graphene

Cited by 49 publications

References 44 publications

Peculiar electronic states, symmetries, and Berry phases in irradiated α−T3 materials

Peculiar electronic states, symmetries, and Berry phases in irradiated α−T3 materials

One-way transport in laser-illuminated bilayer graphene: A Floquet isolator

Crossover of spin Hall to quantum anomalous Hall effect in PbC/MnSe heterostructures

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