Non-canonical distribution and non-equilibrium transport beyond weak system-bath coupling regime: A polaron transformation approach

Xu, Dingbang; Cao, Jianshu

doi:10.1007/s11467-016-0540-2

Cited by 98 publications

(80 citation statements)

References 95 publications

(122 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With the DCG method we could thus show that there is an intermediate regime between a genuine quantum effect and a classical rate equation dynamics to optimize the performance of a quantum device under dissipative conditions. This seems thus reminiscent to the interplay of quantum and dissipative effects in other transport scenarios [60][61][62][63].…”

Section: Discussionmentioning

confidence: 94%

Maxwell’s demon in the quantum-Zeno regime and beyond

Engelhardt

Schaller

2018

New J. Phys.

View full text Add to dashboard Cite

The long-standing paradigm of Maxwell's demon is till nowadays a frequently investigated issue, which still provides interesting insights into basic physical questions. Considering a single-electron transistor, where we implement a Maxwell demon by a piecewise-constant feedback protocol, we investigate quantum implications of the Maxwell demon. To this end, we harness a dynamical coarsegraining method, which provides a convenient and accurate description of the system dynamics even for high measurement rates. In doing so, we are able to investigate the Maxwell demon in a quantumZeno regime leading to transport blockade. We argue that there is a measurement rate providing an optimal performance. Moreover, we find that besides building up a chemical gradient, there can be also a regime where the feedback loop additionally extracts energy, which results from the energy nonconserving character of the projective measurement.

show abstract

Section: Discussionmentioning

confidence: 94%

Maxwell’s demon in the quantum-Zeno regime and beyond

Engelhardt

Schaller

2018

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…and the sum extends over all eigenvalues ò. Similarly, the environment operators in (26) are evaluated in the interaction picture. We note that (25) is not in Lindblad form because we have not made the secular approximation in the master equation.…”

Section: Master Equation Formalismmentioning

confidence: 99%

“…To derive the absorption and emission rates of the -ñ | we start from the ECF definition (26). As given in the main text, but given again here for ease, we first partition the photon interaction Hamiltonian (18) into system and environment operators as…”

Section: Appendix a Emission And Absorption Rates From The Antisymmementioning

confidence: 99%

“…We treat the strong coupling by using a polaron transformation [22]. Energy transfer in the polaron frame has been studied before [22][23][24][25][26][27], but not in the context of dark state protection. We will show that strong coupling has a profound effect on quantum interference processes such that it no longer necessarily improves the efficiency of devices.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal power generation using dark states in dimers strongly coupled to their environment

2019

View full text Add to dashboard Cite

Dark state protection has been proposed as a mechanism to increase the power output of light harvesting devices by reducing the rate of radiative recombination. Indeed many theoretical studies have reported increased power outputs in dimer systems which use quantum interference to generate dark states. These models have typically been restricted to particular geometries and to weakly coupled vibrational baths. Here we consider the experimentally-relevant strong vibrational coupling regime with no geometric restrictions on the dimer. We analyze how dark states can be formed in the dimer by numerically minimizing the emission rate of the lowest energy excited eigenstate, and then calculate the power output of the molecules with these dark states. We find that there are two distinct types of dark states depending on whether the monomers form homodimers, where energy splittings and dipole strengths are identical, or heterodimers, where there is some difference. Homodimers, which exploit destructive quantum interference, produce high power outputs but strong phonon couplings and perturbations from ideal geometries are extremely detrimental. Heterodimers, which are closer to the classical picture of a distinct donor and acceptor molecule, produce an intermediate power output that is relatively stable to these changes. The strong vibrational couplings typically found in organic molecules will suppress destructive interference and thus favor the dark-state enhancement offered by heterodimers.

show abstract

“…The NEGF * dhe@xmu.edu.cn approach can deal with strong system-bath couplings but is unable to capture strong anharmonicity whereas the QME approach deals perturbatively with the system-bath coupling. Other sophisticated approaches based on path-integral techniques or polaron transformation have been restricted mainly to the spin-boson model and have studied the control of heat flux and its geometric properties in the strong system-bath coupling regime [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Thingna

Cao

2018

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We study the effect of system-bath coupling strength on quantum thermal transport through the interface of two weakly coupled anharmonic molecular chains by using a quantum self-consistent phonon approach. The approach inherently assumes that the two segments (anharmonic molecular chains) are approximately in local thermal equilibrium with respect to the baths that they are connected to and transforms the strongly anharmonic system into an effective harmonic one with a temperature-dependent transmission. Despite the approximations, the approach is ideal for our setup, wherein the weak interfacial coupling guarantees an approximate local thermal equilibrium of each segment and short chain length (less than the phonon mean-free path) ensues from the effective harmonic approximation. Remarkably, the heat current shows a resonant to bi-resonant transition due to the variations in the interfacial coupling and temperature, which is attributed to the delocalization of phonon modes. Delocalization occurs only in the strong system-bath coupling regime and we utilize it to model a thermal rectifier whose ratio can be nonmonotonically tuned not only with the intrinsic system parameters but also with the external temperature.

show abstract

Non-canonical distribution and non-equilibrium transport beyond weak system-bath coupling regime: A polaron transformation approach

Cited by 98 publications

References 95 publications

Maxwell’s demon in the quantum-Zeno regime and beyond

Maxwell’s demon in the quantum-Zeno regime and beyond

Optimal power generation using dark states in dimers strongly coupled to their environment

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Contact Info

Product

Resources

About