Thermodynamic properties of a monolayer transition metal dichalcogenide (TMD) quantum dot in the presence of magnetic field

Abstract

This work treats entropy and heat capacity of a monolayer transition metal dichalcogenide quantum dot under magnetic field using the canonical ensemble approach. We consider four following TMDs: MoSe2, MoS2, WSe2 and WS2. At low temperature heat capacity increases steadily, shows a shoulder and thereafter becomes constant for high temperatures. MoSe2 absorbs the most energy near absolute zero temperature and WS2 absorbs the least energy at room temperature. Mo materials perform better than W materials at low temperatures and also at room temperature but require a higher magnetic field to be excited. As a result, WS2 require the least magnetic field and MoSe2 the highest for both temperatures. Furthermore, at low temperatures it is observed that the entropy decreases with increasing magnetic field, while at higher temperatures, it is weakly dependent on the magnetic field; magnetic field can be used to modulate the thermodynamic properties of TMDs