Coherent quantum transport in disordered systems: I. The influence of dephasing on the transport properties and absorption spectra on one-dimensional systems

Moix, Jeremy M.; Khasin, Michael; Cao, Jianshu

doi:10.1088/1367-2630/15/8/085010

Cited by 125 publications

(185 citation statements)

References 57 publications

Supporting

Mentioning

175

Contrasting

Order By: Relevance

“…Recently, it has been shown that the RTA becomes exact in a model for exciton transport where the inelastic scattering time is replaced by the decoherence time of the exciton. [106] The effects of short-time correlations in the dynamics of disorder have been recently studied in Ref. [107] using a stochastic model similar to Ref.…”

Section: Relaxation Time Approximationmentioning

confidence: 99%

The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

Fratini

Mayou

Ciuchi

2016

Adv Funct Materials

338

452

View full text Add to dashboard Cite

Charge transport in crystalline organic semiconductors is intrinsically limited by the presence of large thermal molecular motions, which are a direct consequence of the weak van der Waals inter-molecular interactions. These lead to an original regime of transport called transient localization, sharing features of both localized and itinerant electron systems. After a brief review of experimental observations that pose a challenge to the theory, we concentrate on a commonly studied model which describes the interaction of the charge carriers with inter-molecular vibrations. We present different theoretical approaches that have been applied to the problem in the past, and then turn to more modern approaches that are able to capture the key microscopic phenomenon at the origin of the puzzling experimental observations, i.e. the quantum localization of the electronic wavefuntion at timescales shorter than the typical molecular motions. We describe in particular a relaxation time approximation which clarifies how the transient localization due to dynamical molecular motions relates to the Anderson localization realized for static disorder, and allows us to devise strategies to improve the mobility of actual compounds. The relevance of the transient localization scenario to other classes of systems is briefly discussed.

show abstract

Section: Relaxation Time Approximationmentioning

confidence: 99%

The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

Fratini

Mayou

Ciuchi

2016

Adv Funct Materials

338

452

View full text Add to dashboard Cite

show abstract

“…We consider here a paradigmatic model with N twolevels systems arranged in a ring structure, which has been also analyzed in several papers [5,17,26,[30][31][32] to describe different systems, such as molecular J-aggregates [6], bio-inspired devices for photon sensing [17], and efficient light-harvesting systems [30]. In particular, it has been often considered in the frame of exciton transport in natural photosynthetic complexes, such as LHI, LHII, where chlorophyll molecules are held in a ring-like structure by a protein scaffold [33].…”

Section: The Modelmentioning

confidence: 99%

“…The interplay of dephasing (homogeneous broadening) and static disorder has also been analyzed in Refs. [26,29].…”

Section: Introductionmentioning

confidence: 99%

Cooperative robustness to dephasing: Single-exciton superradiance in a nanoscale ring to model natural light-harvesting systems

et al. 2014

View full text Add to dashboard Cite

We analyze a 1-d ring structure composed of many two-levels systems, in the limit where only one excitation is present. The two-levels systems are coupled to a common environment, where the excitation can be lost, which induces super and subradiant behavior. Moreover, each two-levels system is coupled to another independent environment, modeled by a classical white noise, simulating a dephasing bath and described by the Haken-Strobl master equation. Single exciton Superradiance, an example of cooperative quantum coherent effect, is destroyed at a critical dephasing strength proportional to the system size, showing robustness of cooperativity to the action of the dephasing environment. We also show that the coupling to a common decay channel contrasts the action of dephasing, driving the entanglement decay to slow down on increasing the system size. Moreover, after a projective measurement which finds the excitation in the system, the entanglement reaches a stationary value, independent of the initial conditions.

show abstract

“…In particular, much of recent research focused on one-dimensional nanostructures, due to their relevance to molecular aggregates, such as the J-aggregates [6], natural photosynthetic systems [7], bioengineered devices for photon sensing [8] and lightharvesting systems [9].…”

Section: Introductionmentioning

confidence: 99%

Cooperative robustness to static disorder: Superradiance and localization in a nanoscale ring to model light-harvesting systems found in nature

2014

View full text Add to dashboard Cite

We analyze a 1-d ring structure composed of many two-level systems, in the limit where only one excitation is present. The two-level systems are coupled to a common environment, where the excitation can be lost, which induces super and subradiant behavior, an example of cooperative quantum coherent effect. We consider time-independent random fluctuations of the excitation energies. This static disorder, also called inhomogeneous broadening in literature, induces Anderson localization and is able to quench Superradiance. We identify two different regimes: i) weak opening, in which Superradiance is quenched at the same critical disorder at which the states of the closed system localize; ii) strong opening, with a critical disorder strength proportional to both the system size and the degree of opening, displaying robustness of cooperativity to disorder. Relevance to photosynthetic complexes is discussed.

show abstract

Coherent quantum transport in disordered systems: I. The influence of dephasing on the transport properties and absorption spectra on one-dimensional systems

Cited by 125 publications

References 57 publications

The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

Cooperative robustness to dephasing: Single-exciton superradiance in a nanoscale ring to model natural light-harvesting systems

Cooperative robustness to static disorder: Superradiance and localization in a nanoscale ring to model light-harvesting systems found in nature

Contact Info

Product

Resources

About