2019/04/30 by David M T Kuo, David M.-T. Kuo, Yia-Chung Chang +1
Engineering · Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Condensed matter physics #Current (fluid) #Diode #Heat current #Materials science #Nanowire #Optoelectronics #Phonon #Physics #Power (physics) #Quantum dot #Quantum mechanics #Superlattice #Thermal Radiation and Cooling Technologies #Thermal conductivity #Thermal properties of materials #Thermodynamics #cond-mat.mes-hall
paper · pdf · doi:10.1016/j.physe.2019.113671
6 pages and 5 figures
arxiv created 2019/08/04 · openalex publication_date 2019/08/06 · arxiv updated 2019/09/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Heat engines (HEs) made of low dimensional structures offer promising applications in energy harvesting due to their reduced phonon thermal conductance. Many efforts have been devoted to the design of HEs made of quantum-dot (QD) superlattice nanowire (SLNW), but only SLNWs with uniform energy levels in QDs were considered. Here we propose a HE made of SLNW with staircase-like QD energy levels. It is demonstrated that the nonlinear Seebeck effect can lead to significant electron transports for such a nanowire with staircase-like energy levels. The asymmetrical alignment of energy levels of quantum dots embedded in nanowires can be controlled to allow resonant electron transport under forward temperature bias, while they are in off-resonant regime under backward bias. Under such a mechanism,the power output and efficiency of such a SLNW are better than SLNWs with uniform QD energy levels. The SLNW HE has direction-dependent power output and heat current. In addition, the HE has the functionality of a heat diode with impressive negative differential thermal conductance under open circuit condition.