Strong system-bath coupling induces negative differential thermal conductance and heat amplification in nonequilibrium two-qubit systems.

@article{Liu2019StrongSC,
  title={Strong system-bath coupling induces negative differential thermal conductance and heat amplification in nonequilibrium two-qubit systems.},
  author={Huan Liu and Chen Wang and Luqin Wang and Jie Ren},
  journal={Physical review. E},
  year={2019},
  volume={99 3-1},
  pages={
          032114
        }
}
Quantum heat transfer is analyzed in nonequilibrium two-qubits systems by applying the nonequilibrium polaron-transformed Redfield equation combined with full counting statistics. Steady-state heat currents with weak and strong qubit-bath couplings are clearly unified. Within the two-terminal setup, the negative differential thermal conductance is unraveled with strong qubit-bath coupling and finite qubit splitting energy. The partially strong spin-boson interaction is sufficient to show the… 
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References

SHOWING 1-10 OF 124 REFERENCES
Negative differential thermal conductance and heat amplification in a nonequilibrium triangle-coupled spin-boson system at strong coupling
We investigate the nonequilibrium quantum heat transfer in a triangle-coupled spin-boson system within a three-terminal setup. By including the nonequilibrium noninteracting blip approximation
Unifying quantum heat transfer in a nonequilibrium spin-boson model with full counting statistics
To study the full counting statistics of quantum heat transfer in a driven nonequilibrium spin-boson model, we develop a generalized nonequilibrium polaron-transformed Redfield equation with an
Quantum heat transport of a two-qubit system: Interplay between system-bath coherence and qubit-qubit coherence.
TLDR
The HEOM results exhibit turnover behavior of the heat current as a function of the system-bath coupling strength for all values of the interqubit coupling strength, while the results obtained with the TCL and FGR approaches do not exhibit such behavior, because they do not possess the capability of treating the q-b and q-q coherences.
Quantum thermal transistor based on qubit-qutrit coupling.
TLDR
It is shown that the thermal transistor, as a three-terminal device, allows a weak modulation heat current to switch on and off and effectively modulate the heat current between the other two terminals.
Quantum effects in thermal conduction: Nonequilibrium quantum discord and entanglement
We study the process of heat transfer through an entangled pair of two-level systems, demonstrating the role of quantum correlations in this nonequilibrium process. While quantum correlations
Dynamic control of quantum geometric heat flux in a nonequilibrium spin-boson model
We study the quantum geometric heat flux in the nonequilibrium spin-boson model. By adopting the noninteracting-blip approximation that is able to accommodate the strong system-bath coupling, we show
Energy transfer in the nonequilibrium spin-boson model: From weak to strong coupling.
TLDR
A bias-induced nonmonotonic behavior of the energy conductance in the intermediate coupling regime, resulting from the resonant character of theEnergy transfer in the nonequilibrium spin-boson model, may offer a nontrivial quantum control knob over energy transfer at the nanoscale.
Quantum fluctuation theorem for heat exchange in the strong coupling regime
We study quantum heat exchange in a multistate impurity coupled to two thermal reservoirs. Allowing for strong system-bath interactions, we show that a steady-state heat-exchange fluctuation theorem
Frequency-dependent current noise in quantum heat transfer: A unified polaron calculation.
TLDR
A theory which combines Markovian quantum master equations with a finite time full counting statistics is presented and it is found that the FDCN with varying coupling strengths or bias displays a universal Lorentzian-shape scaling form in the weak coupling regime, and a white noise spectrum emerges in the strong coupling regime due to distinctive spin dynamics.
Nonequilibrium Energy Transfer at Nanoscale: A Unified Theory from Weak to Strong Coupling
TLDR
A fluctuation-decoupled quantum master equation approach is developed that is valid ranging from the weak to the strong system-bath coupling regime and dissects the energy transfer as multiple boson processes with even and odd parity.
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