arXiv subjects

O. Abah

Publications and source records attributed to O. Abah.

3 recordsLinked to original sources

arXiv2026

Quantum Otto machine with $q$-deformed P\"oschl-Teller oscillator

We study the impact of the potential parameters of the q-deformed modified P\"oschl-Teller potential on the thermodynamic performance of a quantum Otto cycle, where the $q$-deformed modified P\"oschl-Teller potential serves as the working substance. Analytical expressions for the energy spectrum and wave functions are derived, enabling a systematic investigation of heat exchange, work output, efficiency, and coefficient of performance. We show that $q$-deformation modifies the energy spectrum and creates distinct performance regions in the ($q$, $\Delta$) parameter space. Low ($\Delta$) and high ($q$) favour optimal heat engine efficiency, whereas high ($\Delta$) and low ($q$) improve refrigerator performance. The heat engine efficiency peaks in the low-($\Delta$), high-($q$) regime. These results highlight the q-deformed modified P\"oschl-Teller potential as a versatile and tunable platform for exploring potential parameter-driven effects in quantum thermal machines.

quant-ph↗

arXiv2025

Controllable diatomic molecular quantum thermodynamic machines

We present quantum heat machines using a diatomic molecule modelled by a $q$-deformed potential as a working medium. We analyze the effect of the deformation parameter and other potential parameters on the work output and efficiency of the quantum Otto and quantum Carnot heat cycles. Furthermore, we derive the analytical expressions of work and efficiency as a function of these parameters. Interestingly, our system operates as a quantum heat engine across the range of parameters considered. In addition, the efficiency of the quantum Otto heat engine is seen to be tunable by the deformation parameter. Our findings provide useful insight for understanding the impact of anharmonicity on the design of quantum thermal machines.

quant-ph↗

arXiv2025

Driven Magnon-Photon System as a Tunable Quantum Heat Rectifier

Controlling heat flow at the quantum level is a key challenge for next-generation quantum technologies, including thermal management and quantum information processing. Here, we investigate quantum heat transport in an asymmetrically driven hybrid magnon-photon system in contact with two thermal baths at different temperatures. We demonstrate that external driving of the magnonic subsystem provides a versatile control knob for tailoring steady-state heat currents and their asymmetry. We identify the mechanisms governing thermal rectification in the hybrid system: we find that strong rectification emerges in the regime of weak magnon-photon hybridization combined with intense magnon driving. In this regime, the external drive enables control over both the magnitude and direction of the heat current, allowing the rectification parameter to be tuned across its entire physically accessible range.

cond-mat.mes-hall↗