Magnetic quantum phase transition extension in strained P-doped graphene

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Graphene's unique electronic properties make it a promising material for advanced applications.
• Doping graphene with elements like phosphorus can introduce novel magnetic and electronic behaviors.
• Understanding quantum-thermodynamic effects is crucial for designing next-generation electronic devices.

Purpose of the Study:

• To investigate quantum-thermodynamic effects in phosphorus-doped graphene under biaxial tensile strain.
• To explore the strain-induced magnetic quantum phase transition (MQPT) and its modulation.
• To analyze the thermodynamic properties, such as electronic entropy and specific heat, at finite temperatures.

Main Methods:

• Theoretical exploration of quantum-thermodynamic effects in P-doped graphene.
• Utilizing a Fermi-Dirac statistical model to calculate thermodynamic quantities.
• Analyzing the impact of biaxial tensile strain (ε) on electronic hybridization and magnetic properties.

Main Results:

• A tunable spin magnetic moment in P-doped graphene controlled by strain (ε).
• A strain-modulated magnetic quantum phase transition (MQPT) from a magnetic (sp³ hybridization) to a non-magnetic (sp² hybridization) phase.
• Distinctive Λ-shaped profiles for electronic entropy (Se) and specific heat (Ce) as a function of strain at finite temperatures.

Conclusions:

• The study demonstrates a controllable magnetic-to-nonmagnetic switch in P-doped graphene via tensile strain.
• The observed quantum-thermodynamic effects and tunable magnetic properties offer potential for electronic nanodevices.
• The findings provide insights into manipulating quantum phenomena in 2D materials for technological applications.