We study heat rectification through quantum dots in the Coulomb blockade regime using a master equation approach. consider both cases of two-terminal and four-terminal devices. In configuration, we analyze case single dot with either doubly-degenerate level or two non-degenerate levels. sequential tunneling behaviour currents as functions position energy levels temperature bias. particular, derive an upper bound for closed-circuit setup level. also prove absence identify ideal system...

Nonequilibrium situations where selected currents are suppressed of interest in fields like thermoelectrics and spintronics, raising the question how related noises behave. We study such zero-current charge, spin, heat a two-terminal mesoscopic conductor. In presence voltage, temperature biases, nonequilibrium (shot) can be arbitrarily large, even if their average vanish. However, as soon bias is present, additional equilibrium (thermal-like) noise necessarily occurs. show that this sets an...

We analyze a mesoscopic conductor autonomously performing thermodynamically useful task, such as cooling or producing electrical power, in part of the system—the working substance—by exploiting another terminal set terminals—the resource—that contains stationary nonthermal (nonequilibrium) distribution. Thanks to properties resource, no exchange particles energy with substance is required fulfill task. This resembles action , long only average quantities are considered. Here, we go beyond...

We prove a general inequality between the charge current and its fluctuations valid for any weakly interacting coherent electronic conductor stationary out-of-equilibrium condition, thereby going beyond established fluctuation-dissipation relations. The developed saturates at large temperature bias reveals additional insight heat engines, since it limits output power by fluctuations. It is when thermodynamic uncertainty relations break down due to quantum effects provides stronger...

In conventional solar cells, photogenerated carriers lose part of their energy before they can be extracted to make electricity. The aim hot-carrier cells is extract the this loss, thereby turning more into electrical power. This requires extracting in a nonequilibrium (nonthermal) distribution. Here, we investigate performance for such distributions. We propose quantum transport model which each energy-loss process (carrier thermalization, relaxation, and recombination) simulated by...

We investigate the charge and heat electronic noise in a generic two-terminal mesoscopic conductor absence of corresponding currents. Despite these currents being zero, shot is generated system. show that, irrespective conductor's details specific nonequilibrium conditions, never exceeds its thermal counterpart, thus establishing general bound. Such bound does not exist case noise, which reveals fundamental difference between transport under zero-current conditions.

We study bipartite quantum systems kept at different temperatures where a tunnel coupling between the two subsystems induces transitions. find independent constraints on temperature-bias-dependent, out-of-equilibrium tunneling rates subsystems, which both turn out to be particularly restrictive when coupled are small. These bounds take form of thermodynamic and an energetic constraint, as they associated with dissipated heat absorbed energy required establish deplete temperature bias,...

We analyze the precision of currents in a generic multi-terminal quantum-transport setting. Employing scattering theory, we show that is limited by function particle-current noise can be interpreted as activity classical limit. thereby establish kinetic uncertainty relation for quantum transport. In full limit, find bounds which modify constraints depending on whether system fermionic or bosonic. expect these to guidelines any transport process aiming at high precision.

In conventional solar cells, photogenerated carriers lose part of their energy before they can be extracted to make electricity. The aim hot-carrier cells is extract the this loss, thereby turning more into electrical power. This requires extracting in a nonequilibrium (nonthermal) distribution. Here, we investigate performance for such distributions. We propose quantum transport model which each energy-loss process (carrier thermalization, relaxation, and recombination) simulated by...

We analyze a mesoscopic conductor autonomously performing thermodynamically useful task, such as cooling or producing electrical power, in part of the system -- working substance by exploiting another terminal set terminals resource that contains stationary nonthermal (nonequilibrium) distribution. Thanks to properties resource, on average no exchange particles energy with is required fulfill task. This resembles action demon, long only quantities are considered. Here, we go beyond...

We prove a general inequality between the charge current and its fluctuations valid for any non-interacting coherent electronic conductor stationary out-of-equilibrium condition, thereby going beyond established fluctuation-dissipation relations. The developed bound saturates at large temperature bias reveals additional insight heat engines, since it limits output power by fluctuations. It is when thermodynamic uncertainty relations break down due to quantum effects provides stronger...

Nonequilibrium situations where selected currents are suppressed of interest in fields like thermoelectrics and spintronics, raising the question how related noises behave. We study such zero-current charge, spin, heat a two-terminal mesoscopic conductor. In presence voltage, spin temperature biases, nonequilibrium (shot) can be arbitrarily large, even if their average vanish. However, as soon bias is present, additional equilibrium (thermal-like) noise necessarily occurs. show that this...