Coherent revival of tunneling

Hsu, Liang‐Yan; Rabitz, Herschel

doi:10.1103/physrevb.92.035410

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…By invoking Floquet theory together with single-particle Green's functions, the time-average current with spin degeneracy is computed using 25,26,40,64,68,69 …”

Section: Floquet-scattering Approachmentioning

confidence: 99%

Coherent light-driven electron transport through polycyclic aromatic hydrocarbon: laser frequency, field intensity, and polarization angle dependence

Hsu

Rabitz

2015

Phys. Chem. Chem. Phys.

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A laser field is a potential control tool for operating ultrafast electronic devices due to a wide variety of options such as field strength, frequency, and polarization. To investigate these variables upon electron transport through a single-molecule device, we simulate a phenyl-acetylene macrocycle (PAM) within a linear-polarized laser field using single-particle Green's functions combined with the non-Hermitian Floquet theory. In the absence of the laser field, the PAM behaves as a perfect insulator due to destructive quantum interference. In the weak-field regime, field-amplitude power laws for one-, two-, and three-photon assisted tunneling are evident in the computational results. The study reveals a range of experimentally feasible field strengths for the observation of picoampere current caused by photon assisted tunneling. In addition, we find that the light-driven current is proportional to the cosine square of the polarization angle, and molecular electronic structure is revealed by the current-frequency characteristics. The origin of these behaviors is established using non-Hermitian Floquet perturbation analysis. The computations show that PAM-based optoelectronic switches have robust large on-off switching ratios under weak-field operating conditions, which are not sensitive to asymmetric molecule-lead couplings.

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“…By invoking Floquet theory together with single-particle Green's functions, the time-average current with spin degeneracy is computed using 25,26,40,64,68,69 …”

Section: Floquet-scattering Approachmentioning

confidence: 99%

Coherent light-driven electron transport through polycyclic aromatic hydrocarbon: laser frequency, field intensity, and polarization angle dependence

Hsu

Rabitz

2015

Phys. Chem. Chem. Phys.

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“…Physically, photoelectric current can be generated via the mechanisms of photon-assisted tunneling 18,29,[33][34][35][36][37] or electronic excitation 20,[38][39][40][41][42][43][44] in a molecular junction. From the theoretical aspects, the Floquet-based methods have successfully demonstrated several fascinating phenomena, including photon-assisted tunneling [45][46][47][48][49][50][51][52] , coherent destruction of tunneling 53,54 , coherent revival of tunneling 55 , and quantum ratchet effect 56 . For a single-photon process, kinetic approaches, e.g., quantum master equation approaches 41,[57][58][59][60][61] or non-equilibrium green's function (NEGF) approaches [62][63][64][65][66][67] , a) Electronic mail: lyhsu@gate.sinica.edu.tw offer a clear description of electron current induced by electronic excitation and optical excitation.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced anomalous Coulomb blockade and the role of triplet states in electron transport through an irradiated molecular transistor. II. Effects of electron-phonon coupling and vibrational relaxation

Hsu

2019

The Journal of Chemical Physics

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We generalize our previous theory [Nano Lett. 18, 5015-5023 (2018)] to investigate the influence of electron-phonon (e-p) coupling and vibrational relaxation on photoinduced anomalous Coulomb blockade, which originates from the triplet states and the energy level alignment. We derive the master equation for an irradiated molecular transistor and obtain the relevant rates via the Redfield theory instead of the phenomenological Fermi golden rule approach. To explore the interplay between e-p coupling and vibrational relaxation, we analyze the charge stability diagrams and the current-voltage characteristics (both gate voltage and source-drain bias voltage) under different e-p coupling strengths in two extreme limits of vibrational relaxation (equilibrated and unequilibrated phonon regimes). From the perspective of energy level alignment, we choose four representative situations and derive the analytical formulas of the photoinduced current in the equilibrated regime. The analytical solution reveals a new type of photocurrent due to e-p coupling that does not require the perfect energy level alignment between charged states and triplet states. In general, our study indicates that photoinduced current and anomalous Coulomb blockade caused by the triplet states are supposed to be experimentally observed.

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Coherent revival of tunneling

Cited by 2 publications

References 42 publications

Coherent light-driven electron transport through polycyclic aromatic hydrocarbon: laser frequency, field intensity, and polarization angle dependence

Coherent light-driven electron transport through polycyclic aromatic hydrocarbon: laser frequency, field intensity, and polarization angle dependence

Photoinduced anomalous Coulomb blockade and the role of triplet states in electron transport through an irradiated molecular transistor. II. Effects of electron-phonon coupling and vibrational relaxation

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