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EVALUATING DOT-LEAD COUPLING IN A NONPARABOLIC QUANTUM DOT CONNECTED TO TWO CONDUCTING LEADS
M.A. Grado-Caffaro,M. GRADO-CAFFARO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3
By considering excitons in a semiconductor nonparabolic quantum dot as hydrogen-atom-like quasi-particles confined in a spherical quantum box, the dot being connected to two semi-infinite conducting leads, we propose a theoreticalanalytical approach by which the maximal dot-lead coupling energy is calculated in terms of the maximum Fermi velocity. In addition, numerical computations consistent with the above approach are carried out. Our results constitute a deep insight into the state of the art and agree with experimental data.
MAXIMUM ELECTRICAL CONDUCTANCE OF A METALLIC PARABOLIC QUANTUM DOT VERSUS DOT-LEAD COUPLING
M. A. GRADO-CAFFARO,M. GRADO-CAFFARO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.6
Starting from assuming that the electrical zero-bias conductance in a metallic quantum dot may be represented well by the Breit–Wigner model (which, on the other hand, is certainly appropriate for one-atom metallic wires), the strength of the coupling between a metallic parabolic quantum dot and the involved leads is determined for maximum conductance through the dot. In fact, this maximal conductance is calculated and issues related to off-resonant conduction states are discussed.
M.A. Grado-Caffaro,M. Grado-Caffaro 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Given a one-atom nanowire in the presence of an electrochemical potential, a novel formulation is presented so that the sensitivity to this potential of the number of conducting off-resonant channels is evaluated from defining a suitable parameter which can be viewed as a normalized gradient of the above number with respect to the electrochemical potential. The range of values taken on by this parameter is determined in terms of the electrochemical potential which is assumed to take on strictly positive values only. In fact, sufficiently large strictly positive values of that potential are considered. In addition, a linear operator associated with the sensitivity parameter is introduced and discussed within a commutative semigroup structure.