Electronic heat capacity in bilayer P6 mmm borophene: Effects of a perpendicular electric field, excitonic effects, and dopants

Abstract

In this work, we aim to control the electronic heat capacity (EHC) of bilayer P6 mmm borophene through a perpendicular electric field, excitonic effects, and external dopants. To achieve this, we employ the tight-binding model within a semi-classical framework. Our findings reveal a decrease in EHC under all stimuli due to decreased total electronic states in the system, while the coexistence of electric field and excitonic effects leads to an enhancement of EHC in the strong regime. Additionally, our study highlights a shift in the Schottky anomaly peak at low temperatures only in the strong regime of stimuli. This study is crucial for the design of thermoelectric materials based on borophene.