Victor V. Gozhenko | Searcharxiv

arXiv2023

Size Effects in Periodic Metamaterials

The optical properties of periodic electromagnetic metamaterials are considered as functions of their relative unit cell size $d / λ$. The reflection $R$ and transmission $T$ coefficients are numerically calculated for some realistic metamaterials in a wide range of their relative unit cell size values that comprises different operating regimes of the metamaterials. Peculiarities in $R$ and $T$ behavior are discussed and the causes of those peculiarities are outlined. The obtained results support the opinion on inapplicability of the very homogenization concept to metamaterials whose unit cell size is comparable to the incident wavelength, in contrast to some previously published results.

physics.optics↗

arXiv2015

On Pendry's effective electron mass

In 1996, J. Pendry, an English theoretical physicist put forward an idea about the dependence of the effective electron mass on the magnetic field, while interpreting the dielectric response of metal wire mesh structures. The idea was based on the well-known relation between the kinematic and canonical momenta of a charged particle moving in the magnetic field. In this paper, proceeding from the universal character of that relation, the applicability of Pendry's effective electron mass $m_{\text{eff}}$ to the problem of electrons in metal mesh structures, as well as to a wide class of problems for charges moving in the magnetic field, has been examined. The general properties of $m_{\text{eff}}$ following directly from its definition were found, and an analogy between the effective electron mass $m_{\text{eff}}$ and $m^{\ast}$ known in the solid-state theory was established. A physical interpretation of $m_{\text{eff}}$ was proposed. It was demonstrated in several examples that, despite the generality of the defining relation for the effective mass $m_{\text{eff}}$, the use of $m_{\text{eff}}$ beyond the problem of the dielectric response of metal wire mesh structures leads to incorrect results.

cond-mat.mes-hall↗