12 papers
Equilibrium Thermodynamics of Non-Hermitian Dirac Fermions: Caloric and Magnetic Responses
Francisco J. Peña, Bastian Castorene, Juan Pablo Esparza +2
We establish scaling relations governing the equilibrium thermodynamics of real-spectrum non-Hermitian Dirac fermions in a magnetic field. Assuming thermalization with respect to t…
Exact Combinatorial Density of States for the Critical 1D Ising Model
Bastian Castorene, Francisco J. Peña, Martin HvE Groves +1
This work presents an exact microcanonical combinatorial analysis of the one-dimensional antiferromagnetic Ising model. At the primary ground-state level crossing , degenera…
Thermodynamic signatures of non-Hermiticity in Dirac materials via quantum capacitance
Juan Pablo Esparza, Francisco J. Peña, Patricio Vargas +1
Non-Hermitian band descriptions capture how loss, gain, and environmental coupling reshape quantum matter, yet most experimental tests rely on wave-based or dynamical probes. Here…
Bosonic Working Media in a Frustrated Rhombi Chain: Otto and Stirling Cycles from Flat Bands, Caging, and Flux Control
Francisco J. Peña, Francisco J. Peña, Rafael GarcÃa-Zamora +8
We demonstrate that flat-band engineering provides a direct route to control and optimize the thermodynamic performance of quantum heat engines. We consider noninteracting bosons o…
Fundamental Work Scaling and Non-Extensivity in Critical Engines
Bastian Castorene, Martin HvE Groves, Francisco J. Peña +3
We present a general analytical framework for {critical two-isothermal engines that emerge operationally from quasi-static quantum Stirling cycles across ground-state level crossin…
Reaching maximum efficiency in quantum Stirling engines using multilayer graphene
Bastian Castorene, Francisco J. Peña, Eric Suárez Morell +4
In this work, quantum Stirling engines based on monolayer, AB-stacked bilayer, and ABC-stacked trilayer graphene under perpendicular magnetic fields are analyzed. Performance maps…