Two-photon electron transfer between quantum dots

Abstract

One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the result of the presence of a collapsing texture, perhaps coming from some early universe grand unified theory (GUT) phase transition. In this work we propose an alternative explanation based on a completely different kind of texture which appears in a natural way in a broad class of brane-world models. This type of texture, known as a braneskyrmion, can be understood as a hole in the brane which makes it possible to pass through them along the extra-dimensional space. The typical scales needed for the proposed brane-skyrmions to correctly describe the observed CS can be as low as the electroweak scale.

Nutation oscillations of an electromagnetic wave propagating through an ensemble of quantum dots

“…Similar effects accompany the resonant electron transfer between quantum dots produced by the mechanisms described in works [7,10,11]. Nanocluster formation of the described type in a field of nonresonant wave takes place in the diversified systems from quantum dots, but it is rather inconvenient in ordinary atom-molecular systems -the effect essentially depends on the sizes of quantum dots and distance between them.…”

“…Thus, an electron transfer between levels of identical quantum dots at one-photon resonance was considered in [1][2][3][4][5][6][7][8], and [9][10][11][12] treated transfer processes at a combinational and two-photon resonance between discrete levels of an electron system of two quantum dots with essentially different energies. In [13] the case is considered when the levels relating to two different but not necessary identical quantum dots possess approximately similar energy, and it was shown that the system is enough to be affected by electromagnetic field with only one carrier frequency for an electron transfer between quantum dots, and it is not obligatory for any resonance condition to be obeyed.…”

“…A serious of works [1][2][3][4][5][6][7][8][9][10][11] has been devoted to investigating regimes of interactions of an electromagnetic field with quantum dot-type nanostructures and search for an effective mechanism of electromagnetically induced electron transfer. The objective of coherent control (as well as optical, infrared, microwave submillimeter, etc) over electronic processes is significant in many respects.…”