Quantum transport in a single molecular transistor at finite temperature

We study quantum transport in a single molecular transistor in which the central region consists of a single-level quantum dot and is connected to two metallic leads that act as a source and a drain respectively. The quantum dot is considered to be under the influence of electron–electron and electron–phonon interactions. The central region is placed on an insulating substrate that acts as a heat reservoir that interacts with the quantum dot phonon giving rise to a damping effect to the quantum dot. The electron–phonon interaction is decoupled by applying a canonical transformation and then the spectral density of the quantum dot is calculated from the resultant Hamiltonian by using Keldysh Green function technique. We also calculate the tunneling current density and differential conductance to study the effect of quantum dissipation, electron correlation and the lattice effects on quantum transport in a single molecular transistor at finite temperature.

Janus Luminogens with Bended Intramolecular Charge Transfer: Towards Molecular Transistor and Brain Imaging

The ingenious construction of electron donor-acceptor (D-A) system has been proven to be the major trend for novel advanced-performance optoelectronic materials. However, the related development is undiversified and become stereotyped in recent years, and the explorationsof new architecture with both prominentoptoelectronic property and innovatively coined optoelectronic mechanism are appealing yet significantly challenging tasks. We herein exploit a series of novel Janus luminogens, namely TAOs, with unique charge separation in asimple five-membered mesoionic ring.TAOs having low molecular weight present efficient aggregation-induced red/near-infrared emission with up to 21.5% of fluorescence quantum yield. A new mechanism termed as bended intramolecular charge transfer (BICT) is proposed to understand the fluorescence behavior. It is experimentally demonstrated that TAOs exhibit great potential for the use as molecular transistor, and can be efficiently utilized in brain imaging straightforwardly through intravenous postinjection.

Janus Luminogens with Bended Intramolecular Charge Transfer: Towards Molecular Transistor and Brain Imaging

The ingenious construction of electron donor-acceptor (D-A) system has been proven to be the major trend for novel advanced-performance optoelectronic materials. However, the related development is undiversified and become stereotyped in recent years, and the explorationsof new architecture with both prominentoptoelectronic property and innovatively coined optoelectronic mechanism are appealing yet significantly challenging tasks. We herein exploit a series of novel Janus luminogens, namely TAOs, with unique charge separation in asimple five-membered mesoionic ring.TAOs having low molecular weight present efficient aggregation-induced red/near-infrared emission with up to 21.5% of fluorescence quantum yield. A new mechanism termed as bended intramolecular charge transfer (BICT) is proposed to understand the fluorescence behavior. It is experimentally demonstrated that TAOs exhibit great potential for the use as molecular transistor, and can be efficiently utilized in brain imaging straightforwardly through intravenous postinjection.

Quantum Transport in A Single Molecular Transistor at Finite Temperature

We study quantum transport in a single molecular transistor in which the central region consists of a single-level quantum dot and is connected to two metallic leads that act as a source and a drain respectively. The quantum dot is considered to be under the influence of electron-electron and electron-phonon interactions. The central region is placed on an insulating substrate that acts as a heat reservoir that interacts with the quantum dot phonon giving rise to a damping effect to the quantum dot. The electron-phonon interaction is decoupled by applying a canonical transformation and then the spectral density of the quantum dot is calculated from the resultant Hamiltonian by using Keldysh Green function technique. We also calculate the tunneling current density and differential conductance to study the effect of quantum dissipation, electron correlation and the lattice effects on quantum transport in a single molecular transistor at finite temperature.