Modeling the electroluminescence of atomic wires from quantum dynamics simulations

被引:2
作者
Bustamante, Carlos M. [1 ]
Todorov, Tchavdar [2 ]
Gadea, Esteban D. [3 ]
Tarasi, Facundo [3 ]
Stella, Lorenzo [4 ]
Horsfield, Andrew [5 ]
Scherlis, Damian A. [3 ]
机构
[1] Max Planck Inst Struct & Dynam Matter, D-22761 Hamburg, Germany
[2] Queens Univ Belfast, Ctr Quantum Mat & Technol, Sch Math & Phys, Belfast BT7 1NN, North Ireland
[3] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Quim Inorgan Analit & Quim Fis, INQUIMAE, Buenos Aires, Argentina
[4] Queens Univ Belfast, Ctr Light Matter Interact, Sch Math & Phys, Belfast BT7 1NN, North Ireland
[5] Imperial Coll London, Thomas Young Ctr, Dept Mat, South Kensington Campus, London SW7 2AZ, England
关键词
NEGATIVE DIFFERENTIAL RESISTANCE; LIGHT-EMITTING-DIODES; UP-CONVERSION; FLUORESCENCE; MOLECULES;
D O I
10.1063/5.0201447
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Static and time-dependent quantum-mechanical approaches have been employed in the literature to characterize the physics of light-emitting molecules and nanostructures. However, the electromagnetic emission induced by an input current has remained beyond the realm of molecular simulations. This is the challenge addressed here with the help of an equation of motion for the density matrix coupled to a photon bath based on a Redfield formulation. This equation is evolved within the framework of the driven-Liouville von Neumann approach, which incorporates open boundaries by introducing an applied bias and a circulating current. The dissipated electromagnetic power can be computed in this context from the time derivative of the energy. This scheme is applied in combination with a self-consistent tight-binding Hamiltonian to investigate the effects of bias and molecular size on the electroluminescence of metallic and semiconducting chains. For the latter, a complex interplay between bias and molecular length is observed: there is an optimal number of atoms that maximizes the emitted power at high voltages but not at low ones. This unanticipated behavior can be understood in terms of the band bending produced along the semiconducting chain, a phenomenon that is captured by the self-consistency of the method. A simple analytical model is proposed that explains the main features revealed by the simulations. The methodology, applied here at a self-consistent tight-binding level but extendable to more sophisticated Hamiltonians such as density functional tight binding and time dependent density functional theory, promises to be helpful for quantifying the power and quantum efficiency of nanoscale electroluminescent devices.
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页数:10
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