TY - JOUR
T1 - Continuous-time quantum walk on an extended star graph
T2 - Disorder-enhanced trapping process
AU - Yalouz, Saad
AU - Pouthier, Vincent
PY - 2020/1/28
Y1 - 2020/1/28
N2 - Using a tight binding model, we investigate the dynamics of an exciton on a disordered extended star graph whose central site acts as an energy trap. When compared with what happens in an ordered network, our results reveal that the disorder drastically improves the excitonic absorption that becomes complete. Moreover, we show the occurrence of an optimal disorder for which the absorption time is strongly minimized, a surprising effect that originates in a disorder-induced restructuring process of the exciton eigenstates. Finally, we also show the existence of an optimal value of the absorption rate that reduces even more the absorption time. The resulting superoptimized trapping process is interpreted as a positive interplay between both the disorder and the so-called superradiance transition.
AB - Using a tight binding model, we investigate the dynamics of an exciton on a disordered extended star graph whose central site acts as an energy trap. When compared with what happens in an ordered network, our results reveal that the disorder drastically improves the excitonic absorption that becomes complete. Moreover, we show the occurrence of an optimal disorder for which the absorption time is strongly minimized, a surprising effect that originates in a disorder-induced restructuring process of the exciton eigenstates. Finally, we also show the existence of an optimal value of the absorption rate that reduces even more the absorption time. The resulting superoptimized trapping process is interpreted as a positive interplay between both the disorder and the so-called superradiance transition.
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U2 - 10.1103/PhysRevE.101.012310
DO - 10.1103/PhysRevE.101.012310
M3 - Article
AN - SCOPUS:85078842794
VL - 101
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 1
M1 - 012310
ER -