ar X iv : c on d - m at / 0 21 13 57 v 1 1 8 N ov 2 00 2 Theoretical Study of Photon Emission from Molecular Wires
نویسندگان
چکیده
We explore theoretically the principles that govern photon emission from single-molecule conductors carrying electric currents between metallic contacts. The molecule and contacts are represented by a generic tight-binding model. The electric current is calculated using Landauer theory and the pho-ton emission rate is obtained using Fermi's golden rule. The bias-dependence of the electronic structure of the molecular wire is included in the theory in a simple way. Conditions under which significant photon emission should occur are identified and photon spectra are calculated. We predict the photon emission rate to be more sensitive than the electric current to coupling asymmetries between the molecule and contacts. This has important implications for the design and interpretation of STM experiments searching for electro-luminescence from individual molecules. We discuss how electroluminescence may be used to measure important characteristics of the electronic structure of molecular wires such as the HOMO-LUMO gap and location of the Fermi level of the contacts relative to the HOMO and LUMO. The feasibility of observing photon emission from Au/benzene-dithiolate molecular wires is also discussed.
منابع مشابه
ar X iv : c on d - m at / 0 21 13 31 v 1 1 5 N ov 2 00 2 Universality classes in creep rupture
Ferenc Kun, Yamir Moreno, Raul Cruz Hidalgo, Hans. J. Herrmann Department of Theoretical Physics, University of Debrecen, P.O.Box: 5, H-4010 Debrecen, Hungary The Abdus Salam International Center for Theoretical Physics (ICTP), Condensed Matter Group, P.O.Box: 586, I-34014 Trieste, Italy, Institute for Computational Physics, University of Stuttgart, Pfaffenwaldring 27, 70569 Stuttgart, Germany ...
متن کاملar X iv : h ep - p h / 05 11 13 2 v 1 1 0 N ov 2 00 5 Jet and inclusive particle production in photon induced collisions ∗
Recent progress in application of higher order QCD calculations to jet and inclusive particle production in photon induced collisions is reviewed. Attention is paid to theoretical uncertainties of such calculations, particularly those coming from the choice of renormalization and factorization scales.
متن کاملar X iv : n uc l - ex / 0 21 00 14 v 2 2 0 N ov 2 00 2 1 Anisotropic flow
Recent experimental results on directed and elliptic flow, theoretical developments, and new techniques for anisotropic flow analysis are reviewed.
متن کاملar X iv : m at h - ph / 0 21 10 28 v 2 1 1 N ov 2 00 3 Geometric integrators and nonholonomic mechanics
A geometric derivation of nonholonomic integrators is developed. It is based in the classical technique of generating functions adapted to the special features of nonholonomic systems. The theoretical methodology and the integrators obtained are different from the obtained in [12]. In the case of mechanical systems with linear constraints a family of geometric integrators preserving the nonholo...
متن کاملar X iv : h ep - l at / 0 01 10 13 v 3 8 N ov 2 00 0 1 Chemical potential response of meson masses at finite temperature
We study the response of meson masses to the chemical potential (∂m/∂µ) at high temperature and at zero chemical potential on N f = 2 lattice with staggered fermions. Preliminary results for the meson composed of different quarks show that ∂m/∂µ|µ=0 is negative in the confinement phase and positive in the deconfinement phase.
متن کامل