Magnetoelectric effect in simple collinear antiferromagnetic spinels

Saha, Rana; Ghara, Somnath; Suard, Emmanuelle; Jang, Deok‐Jin; Kim, Kee Hoon; Ter-Oganessian, N. V.; Sundaresan, A.

doi:10.1103/physrevb.94.014428

Cited by 35 publications

(36 citation statements)

References 28 publications

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“…For our numerical analysis, we have taken the system parameters for typical SD material according to Ref. [20] and the references therein. The various parameters are taken as α = 7.5 meV nm 2 , v = 65 meV nm, δ 0 = 10 meV.…”

Section: Drude Conductivitymentioning

confidence: 99%

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Direction-dependent giant optical conductivity in two-dimensional semi-Dirac materials

Mawrie

Muralidharan

2019

Phys. Rev. B

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We show that the gap parameter in semi-Dirac material induces a large degree of sensitivity for inter-band optical conductivity with respect to the polarization direction. The optical conductivity reveals an abruptly large value at a certain frequency for light along a particular polarization direction while it is significantly suppressed along the direction orthogonal to the former. The direction-dependent optical conductivity may, in turn, be used to uniquely predict the dispersive nature of the 2D semi-Dirac materials, in addition to other possible applications in the field of transparent conductors.

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Section: Drude Conductivitymentioning

confidence: 99%

“…The electron and hole states are degenerated at the two nodal points and separated by a gap ∆ k elsewhere. There are also theoretical predictions of photoinduced topological phase transition and gap opening at the two nodal points at high momentum of the radiation 20,21 . The plot of band dispersion with respect to Eq.…”

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confidence: 99%

Direction-dependent giant optical conductivity in two-dimensional semi-Dirac materials

Mawrie

Muralidharan

2019

Phys. Rev. B

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“…Existence of FTI phase was also predicted in graphene for the first time. Since then there have been several studies on Floquet topological phase on honeycomb lattice [15][16][17][18][19] in addition to other two-band systems [20][21][22][23] . It has been shown that the effect of periodically driven circularly polarized light leads to a non-trivial mass term similar to that found in Haldane model 24 .…”

Section: Introductionmentioning

confidence: 99%

Emergence of photo-induced multiple topological phases on square-octagon lattice

Sil

Ghosh²

2019

J. Phys.: Condens. Matter

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In this study, a tight-binding model on square-octagon lattice with nearest-neighbour and nextnearest-neighbour hoppings is considered. The system is topologically trivial although it exhibits quadratic band-touching points in its band-structure. It is shown that the system drives towards topologically non-trivial phases as soon as it is exposed to monochromatic circularly polarized light. Multiple topological phases are found to emerge with the variation of amplitude of light. An effective time-independent Hamiltonian of the system is obtained following the Floquet-Bloch formulation. Quasi-energy band-structures along with definite values of Chern numbers for respective bands are obtained. Characterization of topological phases are made in terms of band structure and Chern numbers. In addition, Hall conductance and topologically protected chiral edge states are obtained to explain the topological properties. Density of states is obtained in every case. The system undergoes a series of topological phase transitions among various topological phases upon variations of both amplitude of light and hopping strengths. It exhibits Chern insulating and Chern semimetallic phases depending on the values of lattice filling.PACS numbers:

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“…The Hofstadter butterfly [9,10] also emerges when a perpendicular magnetic field is applied to a periodic electronic crystal lattice, and has been experimentally realized in some systems [11][12][13]. Beside the effects of a perpendicular magnetic field, periodically driven electronic systems have garnered considerable attention as a mechanism for engineering Floquet topological bands [14][15][16][17][18][19][20][21][22][23][24][25] in topologically trivial metallic systems. Recently, a handful of studies have examined the combined effects of a periodic drive and a perpendicular magnetic field in the context of the electronic Floquet Hofstadter butterfly [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Magnonic Floquet Hofstadter butterfly

Owerre

2018

Annals of Physics

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We introduce the magnonic Floquet Hofstadter butterfly in the two-dimensional insulating honeycomb ferromagnet. We show that when the insulating honeycomb ferromagnet is irradiated by an oscillating space-and time-dependent electric field, the hopping magnetic dipole moment (i.e. magnon quasiparticles) accumulate the Aharonov-Casher phase. In the case of only space-dependent electric field, we realize the magnonic Hofstadter spectrum with similar fractal structure as graphene subject to a perpendicular magnetic field, but with no spin degeneracy due to broken time-reversal symmetry by the ferromagnetic order. In addition, the magnonic Dirac points and Landau levels occur at finite energy as expected in a bosonic system. Remarkably, this discrepancy does not affect the topological invariant of the system. Consequently, the magnonic Chern number assumes odd values and the magnon Hall conductance gets quantized by odd integers. In the case of both space-and time-dependent electric field, the theoretical framework is studied by the Floquet formalism. We show that the magnonic Floquet Hofstadter spectrum emerges entirely from the oscillating space-and time-dependent electric field, which is in stark contrast to electronic Floquet Hofstadter spectrum, where irradiation by circularly polarized light and a perpendicular magnetic field are applied independently. We study the deformation of the fractal structure at different laser frequencies and amplitudes, and analyze the topological phase transitions associated with gap openings in the magnonic Floquet Hofstadter butterfly. arXiv:1809.09102v1 [cond-mat.str-el]

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Magnetoelectric effect in simple collinear antiferromagnetic spinels

Cited by 35 publications

References 28 publications

Direction-dependent giant optical conductivity in two-dimensional semi-Dirac materials

Direction-dependent giant optical conductivity in two-dimensional semi-Dirac materials

Emergence of photo-induced multiple topological phases on square-octagon lattice

Magnonic Floquet Hofstadter butterfly

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