scholarly journals Superadiabatic quantum heat engine with a multiferroic working medium

2016 ◽  
Vol 94 (3) ◽  
Author(s):  
L. Chotorlishvili ◽  
M. Azimi ◽  
S. Stagraczyński ◽  
Z. Toklikishvili ◽  
M. Schüler ◽  
...  
Keyword(s):  
Heat Engine ◽  
Quantum Heat Engine ◽  
Working Medium

scholarly journals An interaction-driven many-particle quantum heat engine and its universal behavior

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Yang-Yang Chen ◽  
Gentaro Watanabe ◽  
Yi-Cong Yu ◽  
Xi-Wen Guan ◽  
Adolfo del Campo
Keyword(s):  
Low Temperatures ◽  
Degrees Of Freedom ◽  
Heat Engine ◽  
Interaction Strength ◽  
Luttinger Liquid ◽  
Heating And Cooling ◽  
Quantum Heat Engine ◽  
Working Medium ◽  
Average Work ◽  
Isochoric Heating

Abstract A quantum heat engine (QHE) based on the interaction driving of a many-particle working medium is introduced. The cycle alternates isochoric heating and cooling strokes with both interaction-driven processes that are simultaneously isochoric and isentropic. When the working substance is confined in a tight waveguide, the efficiency of the cycle becomes universal at low temperatures and governed by the ratio of velocities of a Luttinger liquid. We demonstrate the performance of the engine with an interacting Bose gas as a working medium and show that the average work per particle is maximum at criticality. We further discuss a work outcoupling mechanism based on the dependence of the interaction strength on the external spin degrees of freedom.

scholarly journals Measurement Based Quantum Heat Engine with Coupled Working Medium

Entropy ◽  
2019 ◽  
Vol 21 (11) ◽  
pp. 1131 ◽  
Author(s):  
Arpan Das ◽  
Sibasish Ghosh
Keyword(s):  
Heat Engine ◽  
Coupling Constants ◽  
Cyclic Process ◽  
Coupling Constant ◽  
Quantum Heat Engine ◽  
Working Medium ◽  
Single Temperature ◽  
Higher Spin ◽  
Higher Spins ◽  
The Relationship

We consider measurement based single temperature quantum heat engine without feedback control, introduced recently by Yi, Talkner and Kim [Phys. Rev. E 96, 022108 (2017)]. Taking the working medium of the engine to be a one-dimensional Heisenberg model of two spins, we calculate the efficiency of the engine undergoing a cyclic process. Starting with two spin-1/2 particles, we investigate the scenario of higher spins also. We show that, for this model of coupled working medium, efficiency can be higher than that of an uncoupled one. However, the relationship between the coupling constant and the efficiency of the engine is rather involved. We find that in the higher spin scenario efficiency can sometimes be negative (this means work has to be done to run the engine cycle) for certain range of coupling constants, in contrast to the aforesaid work of Yi, Talkner and Kim, where they showed that the extracted work is always positive in the absence of coupling. We provide arguments for this negative efficiency in higher spin scenarios. Interestingly, this happens only in the asymmetric scenarios, where the two spins are different. Given these facts, for judiciously chosen conditions, an engine with coupled working medium gives advantage for the efficiency over the uncoupled one.

scholarly journals Quantum control of excitons for reversible heat transfer

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Conor N. Murphy ◽  
Paul R. Eastham
Keyword(s):  
Heat Transfer ◽  
Quantum Dot ◽  
Quantum Control ◽  
Heat Engine ◽  
Laser Pulses ◽  
Heat Current ◽  
Light Emitting ◽  
Laser Dressing ◽  
Working Medium ◽  
Heat Transfers

Abstract Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium. The heat transfers in such devices are highly irreversible, leading to low efficiencies. Here we predict that reversible heat transfers between a quantum-dot exciton and its phonon environment can be induced by laser pulses. We calculate the heat transfer when a quantum-dot exciton is driven by a chirped laser pulse. The reversibility of this heat transfer is quantified by the efficiency of a heat engine in which it forms the hot stroke, which we predict to reach 95% of the Carnot limit. This performance is achieved by using the time-dependent laser-dressing of the exciton to control the heat current and exciton temperature. We conclude that reversible heat transfers can be achieved in excitonic thermal machines, allowing substantial improvements in their efficiency.

Practical implementation of aCO2-laser-coupled quantum heat engine

2005 ◽  
Vol 72 (4) ◽  
Author(s):  
Alan E. Hill ◽  
Yuri V. Rostovtsev ◽  
Marlan O. Scully
Keyword(s):  
Heat Engine ◽  
Practical Implementation ◽  
Quantum Heat Engine

Comparing Two Definitions of Work for a Biological Quantum Heat Engine

2015 ◽  
Vol 64 (4) ◽  
pp. 409-414
Author(s):  
You-Yang Xu ◽  
Juan Liu ◽  
Shun-Cai Zhao
Keyword(s):  
Heat Engine ◽  
Quantum Heat Engine

scholarly journals Relativistic quantum heat engine from uncertainty relation standpoint

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pritam Chattopadhyay ◽  
Goutam Paul
Keyword(s):  
Uncertainty Relation ◽  
Relativistic Quantum ◽  
Heat Engine ◽  
Potential Well ◽  
Relativistic Case ◽  
Heat Engines ◽  
Quantum Heat Engine ◽  
Thermodynamic Variables ◽  
The One ◽  
Work Done

AbstractEstablished heat engines in quantum regime can be modeled with various quantum systems as working substances. For example, in the non-relativistic case, we can model the heat engine using infinite potential well as a working substance to evaluate the efficiency and work done of the engine. Here, we propose quantum heat engine with a relativistic particle confined in the one-dimensional potential well as working substance. The cycle comprises of two isothermal processes and two potential well processes of equal width, which forms the quantum counterpart of the known isochoric process in classical nature. For a concrete interpretation about the relation between the quantum observables with the physically measurable parameters (like the efficiency and work done), we develop a link between the thermodynamic variables and the uncertainty relation. We have used this model to explore the work extraction and the efficiency of the heat engine for a relativistic case from the standpoint of uncertainty relation, where the incompatible observables are the position and the momentum operators. We are able to determine the bounds (the upper and the lower bounds) of the efficiency of the heat engine through the thermal uncertainty relation.

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