Screening properties and plasmons of Hg(Cd)Te quantum wells

Juergens, Stefan; Michetti, Paolo; Trauzettel, Björn

doi:10.1103/physrevb.90.115425

Cited by 10 publications

(18 citation statements)

References 33 publications

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“…There have been a number of experimental works which investigated the optical response and plasmonic resonances of bulk topological insulators [14][15][16][17][18][19][20][21][22][23][24][25][26] and new theoretical phenomena were predicted. [27][28][29][30] Also, plasmons in topological nano particles have been dealt with. 31,32 Here, we will focus on two aspects which we have discussed previously in Ref.…”

Section: Introductionmentioning

confidence: 99%

Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling

2017

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We demonstrate via three examples that topological insulators (TI) offer a new platform for plasmonics. First, we show that the collective excitations of a thin slab of a TI display spin-charge separation. This gives rise to purely charge-like optical and purely spin-like acoustic plasmons, respectively. Second, we argue that the depletion layer mixes Dirac and Schrödinger electrons which can lead to novel features such as high modulation depths and interband plasmons. The analysis is based on an extension of the usual formula for optical plasmons that depends on the slab width and on the dielectric constant of the TI. Third, we discuss the coupling of the TI surface phonons to the plasmons and find strong hybridisation especially for samples with large slab widths. arXiv:1706.09403v2 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling

2017

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“…Note that in a C 6 symmetric system, only p-states (d-states) with the same spin direction can be coupled and Eq. ( 4) is similar to the electronic Hamiltonian in Bernevig-Hughes-Zhang (BHZ) model [24][25][26], where the two block matrices correspond to the massive Dirac equations with pseudo-spin-up and down, respectively. This pair of pseudo-spin pairs are interconnected by inversion symmetry operation, along with their disparate parities which ensures that the entire system satisfies pseudo TR symmetry.…”

Section: Theory and Modelmentioning

confidence: 98%

Topological edge states of Kekulé-type photonic crystals induced by a synchronized rotation of unit cells

Zhou,

Lin,

Liu

et al. 2021

Preprint

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Generating and manipulating Dirac points in artificial atomic crystals has received attention especially in photonic systems due to their ease of implementation. In this paper, we propose a two-dimensional photonic crystal (PC) made of a Kekulé lattice of pure dielectrics, where the internal rotation of cylindrical pillars induces optical Dirac degeneracy-breaking. Our calculated dispersion reveals that the synchronized rotation reverses bands and switches parity as well so as to induce topological phase transition. Our simulation demonstrates that such topologically protected edge states can achieve robust transmission in almost arbitrarily-deformed defect waveguides and therefore provides a pragmatically tunable scheme to achieve reconfigurable topological phases.

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“…In the literature there exist calculations of dynamical screening function for HgTe quantum wells near the phase transition [12]. However, this model based on the four-band calculations of energy spectrum, which are applicable only at the liquid helium temperatures, and cannot be used even at 77 K.…”

Section: Introductionmentioning

confidence: 99%

Dynamical screening function and plasmons in the wide HgTe quantum wells at high temperatures

Melezhik¹

2018

Semicond. Phys. Quantum Electron. Optoelectron.

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Dynamical screening function of the two-dimensional electron gas in wide HgTe quantum well (QW) has been numerically modelled in this work. Calculations were provided in the Random Phase Approximation (RPA) framework and were based on Lindhard equation. Our simulations directly incorporated non-parabolicity of bulk 2D carriers' spectrum, which was obtained by full 8-band k.p method. In the literature exists data that transport properties of HgTe QWs are explained by graphene-like screening. We provide the comparison of the screening function for the Schrodinger fermions in the inverted bands HgTe QW with the appropriate screening function for graphene monolayer with the Dirac fermions. In addition, the dependencies of HgTe-specific screening function on temperature, scattering wave-vector and frequency are studied with the purpose to study the transport properties under high frequency radiation the QWs structures to be used as THz detectors. Plasmon frequencies of 2DEG in HgTe quantum well under study were calculated in the long-wavelength limit for T = 77 K.

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Screening properties and plasmons of Hg(Cd)Te quantum wells

Cited by 10 publications

References 33 publications

Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling

Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling

Topological edge states of Kekulé-type photonic crystals induced by a synchronized rotation of unit cells

Dynamical screening function and plasmons in the wide HgTe quantum wells at high temperatures

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