Periodic array of quantum rings strongly coupled to circularly polarized light as a topological insulator

Kozin, V. K.; Iorsh, I. V.; Kibis, O. V.; Shelykh, I. A.

doi:10.1103/physrevb.97.035416

Cited by 41 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such a dramatic simplification of Eq. (10) has been made possible mainly due to the fact that in our case h 12…”

Section: A Elliptically-polarized Irradiationmentioning

confidence: 99%

“…[8][9][10][11] Based on these theories, researchers have developed numerous techniques to modify the existing electronic properties of condensed matter materials, which was subsequently referred to as Floquet engineering of various nanostructures [12][13][14] and especially for the novel low-dimensional Dirac cone materials. [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.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2019

View full text Add to dashboard Cite

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.

show abstract

“…Such a dramatic simplification of Eq. (10) has been made possible mainly due to the fact that in our case h 12…”

Section: A Elliptically-polarized Irradiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

show abstract

“…Currently, QD of various geometric forms have been implemented: spherical [5,6], cylindrical [7,8], ellipsoidal [9,10], lens-shaped [11,12], ring-shaped [13,14], etc. Of these geometries, spherical and cylindrical QD have the simplest mathematical description, since in such cases the symmetry of the systems often allows the separation of variables in the corresponding Schrödinger equations [15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Realization of the Kohn’s Theorem in Ge/Si Quantum Dots with Hole Gas: Theory and Experiment

et al. 2019

View full text Add to dashboard Cite

This article discusses specific quantum transitions in a few-particle hole gas, localized in a strongly oblate lens-shaped quantum dot. Based on the adiabatic method, the possibility of realizing the generalized Kohn theorem in such a system is shown. The criteria for the implementation of this theorem in a lens-shaped quantum dot, fulfilled in the experiment, is presented. An analytical expression is obtained for the frequencies of resonant absorption of far-infrared radiation by a gas of heavy holes, which depends on the geometric parameters of the quantum dot. The results of experiments on far-infrared absorption in the arrays of p-doped Ge/Si quantum dots grown by molecular beam epitaxy (MBE) with gradually increasing average number of holes in dot are presented. Experimental results show that the Coulomb interaction between the holes does not affect the resonant frequency of the transitions. A good agreement between the theoretical and experimental results is shown.

show abstract

“…An intense enough electromagnetic field gives rise to a coupled light-matter object known as a dressed electron, which has been studied in various low dimensional systems, including: semiconductor quantum dots [10,11], quantum rings [12,13], quantum wells [14][15][16] etc. The appearance of band gaps due to the ac Stark effect in the band structure of various nanostructures was first predicted theoretically [17] and later observed experimentally [18].…”

Section: Introductionmentioning

confidence: 99%

On the possibility of a terahertz light emitting diode based on a dressed quantum well

Mandal¹,

Dini²,

Liew³

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

We consider theoretically the realization of a tunable terahertz light emitting diode from a quantum well with dressed electrons placed in a highly doped p-n junction. In the considered system the strong resonant dressing field forms dynamic Stark gaps in the valence and conduction bands and the electric field inside the p-n junction makes the QW asymmetric. It is shown that the electrons transiting through the light induced Stark gaps in the conduction band emit photons with energy directly proportional to the dressing field. This scheme is tunable, compact, and shows a fair efficiency.

show abstract

Periodic array of quantum rings strongly coupled to circularly polarized light as a topological insulator

Cited by 41 publications

References 29 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

Realization of the Kohn’s Theorem in Ge/Si Quantum Dots with Hole Gas: Theory and Experiment

On the possibility of a terahertz light emitting diode based on a dressed quantum well

Contact Info

Product

Resources

About