Transition-metal-oxide (TMO) heterostructures are promising candidates for building photon-harvesting devices which can exploit optimal quantum transport of charge excitations generated by light absorption. Here we address the explicit role of an electric field on the quantum transport properties of photo-excitations subject to dephasing in one-dimensional chains coupled to a continuum of states acting as a sink. We show that the average transfer time to the sink is optimized for suitable values of both the coupling strength to the sink and the electric field, thus fully exploiting the coherence-enhanced efficiency in the quantum transport regime achievable in few monolayers TMO heterostructures. The optimal coupling to the continuum remains approximately the same as that in absence of electric field and is characterizing the Superradiant Transition. On the other hand, the optimal electric field for which we provide estimates using an analytical expression is dependent on the initial state.

Kropf, C. M., Celardo, G. L., Giannetti, C., Borgonovi, F., Electric-field assisted optimal quantum transport of photo-excitations in polar heterostructures, <<PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES>>, 2020; 120 (114023): 114023-114033. [doi:10.1016/j.physe.2020.114023] [http://hdl.handle.net/10807/152181]

Electric-field assisted optimal quantum transport of photo-excitations in polar heterostructures

Giannetti, C.
Penultimo
Membro del Collaboration Group
;
Borgonovi, F.
Ultimo
Supervision
2020

Abstract

Transition-metal-oxide (TMO) heterostructures are promising candidates for building photon-harvesting devices which can exploit optimal quantum transport of charge excitations generated by light absorption. Here we address the explicit role of an electric field on the quantum transport properties of photo-excitations subject to dephasing in one-dimensional chains coupled to a continuum of states acting as a sink. We show that the average transfer time to the sink is optimized for suitable values of both the coupling strength to the sink and the electric field, thus fully exploiting the coherence-enhanced efficiency in the quantum transport regime achievable in few monolayers TMO heterostructures. The optimal coupling to the continuum remains approximately the same as that in absence of electric field and is characterizing the Superradiant Transition. On the other hand, the optimal electric field for which we provide estimates using an analytical expression is dependent on the initial state.
Inglese
Kropf, C. M., Celardo, G. L., Giannetti, C., Borgonovi, F., Electric-field assisted optimal quantum transport of photo-excitations in polar heterostructures, <<PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES>>, 2020; 120 (114023): 114023-114033. [doi:10.1016/j.physe.2020.114023] [http://hdl.handle.net/10807/152181]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/152181
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