Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Rupasov, Valery I."'
Autor:
Rupasov, Valery I.
Auger recombination (AR) of the ground biexciton state in quantum-confined lead salt nanowires (NWs) with a strong coupling between the conduction and the valence bands is shown to be strongly suppressed, and only excited biexciton states contribute
Externí odkaz:
http://arxiv.org/abs/0911.5002
Autor:
Rupasov, Valery I.
In the framework of four-band envelope-function formalism, developed earlier for spherical semiconductor nanocrystals, we study the electronic structure and optical properties of quantum-confined lead-salt (PbSe and PbS) nanowires (NWs) with a strong
Externí odkaz:
http://arxiv.org/abs/0902.1497
Autor:
Rupasov, Valery I., Klimov, Victor I.
We propose a novel mechanism for photogeneration of multiexcitons by single photons (carrier multiplication) in semiconductor nanocrystals. In this mechanism, the Coulomb interaction between two valence-band electrons involving their transfer to the
Externí odkaz:
http://arxiv.org/abs/0707.2112
Autor:
Rupasov, Valery I.
In the quantum process of stimulated Raman scattering (SRS), a laser photon propagating in a resonance medium undergoes multifold conversions into a Stokes photon and back. The nontrivial ``cooperative'' behavior of the Stokes component of light tran
Externí odkaz:
http://arxiv.org/abs/quant-ph/0008012
Autor:
Rupasov, Valery I.
We reexamine the Yang-Yang-Takahashi method of deriving the thermodynamic Bethe ansatz equations which describe strongly correlated electron systems of fundamental physical interest, such as the Hubbard, $s-d$ exchange (Kondo) and Anderson models. It
Externí odkaz:
http://arxiv.org/abs/cond-mat/9904308
Autor:
Rupasov, Valery I.
The low-energy physics of a spin-1/2 Kondo impurity in a gapless host, where a density of band states $\rho_0(\epsilon)=|\epsilon|^r/(|\epsilon|^r+\beta^r)$ vanishes at the Fermi level $\epsilon=0$, is studied by the Bethe ansatz. The growth of the p
Externí odkaz:
http://arxiv.org/abs/cond-mat/9902150
Autor:
Rupasov, Valery I.
We study a generalized Kondo model in which a spin-1/2 impurity is coupled to a conduction band by both s-d exchange and potential interactions. A strong potential scattering is shown to screen an exchange scattering, and the Kondo temperature of the
Externí odkaz:
http://arxiv.org/abs/cond-mat/9812240
Autor:
Rupasov, Valery I.
We study a spin-1/2 Kondo impurity coupled to an unconventional host in which the density of band states vanishes either precisely at (``gapless'' systems) or on some interval around the Fermi level (``gapped''systems). Despite an essentially nonline
Externí odkaz:
http://arxiv.org/abs/cond-mat/9812086
Autor:
Rupasov, Valery I.
Using the Bethe ansatz method, we study the ground state properties of a $U\to\infty$ Anderson impurity in a ``gapless'' host, where a density of band states vanishes at the Fermi level $\epsilon_F$ as $|\epsilon-\epsilon_F|$. As in metals, the impur
Externí odkaz:
http://arxiv.org/abs/cond-mat/9810014
Autor:
Rupasov, Valery I.
We propose toy models of unconventional magnetic alloys, in which the density of band states, $\rho(\epsilon)$, and hybridization, $t(\epsilon)$, are energy dependent; it is assumed, however, that $t^2(\epsilon)\propto\rho^{-1}(\epsilon)$, and hence
Externí odkaz:
http://arxiv.org/abs/cond-mat/9807231