Institutional research of nanoelectromagnetics


Siberian Federal University & Institute of Biophisycs SB RAS, Russia

Cavity quantum electrodynamics (QED) has novel effective application with nitrogen-vacancy (NV) centers in diamond nanocrystals. A few theoretical models of QED diamond balls have been analyzed. Taking into account good defined properties of diamond quantum dot and Purcell effect we estimated the Purcell factor of 5 nm diamond ball for several external fields and special boundary conditions. Using the exact analytic solution in the semiclassical Jaynes-Cummings model without the rotating-wave approximation we describe QED cavity with diamond lattice in different states, i.e. before and after quantum chaos. The comparisons these solutions with chaotic Rabi vacuum oscillations in cavity QED allow to estimate quantitative characteristics of interaction into realistic model of nanodiamond. We discuss a few approaches to problem of self-consistency of volume 3D and surface 2D wave functions of 5 nm diamond ball, e.g. introduction of collective excitations or quasiparticles, strongly modified plasmon-matter interaction, floating electrons as anti-quasiparticle, possibility of semi-periodic spherical Bloch function etc. The theoretical models were applied to explain of (1) recent experimental realization of a cavity QED system in which NV centers in diamond nanocrystals are coupled to a whispering gallery mode in a nanosphere, (2) the Josephson junctions of superconductive diamond after boron doping and (3) the superlattice of 5 nm diamond balls (with & without NV centers) with floating electron.