Publications (21)
Kinetic energy of protons in ice Ih and water: a path integral study
R. Ramirez, C. P. Herrero
The kinetic energy of H and O nuclei has been studied by path integral molecular dynamics simulations of ice Ih and water at ambient pressure. The simulations were performed by usi…
Quantum path-integral study of the phase diagram and isotope effects of neon
R. Ramirez, C. P. Herrero
The phase diagram of natural neon has been calculated for temperatures in the range 17-50 K and pressures between 0.01 and 2000 bar. The phase coexistence between solid, liquid, an…
p-Type semiconducting properties in lithium-doped MgO single crystals
M. M. Tardio, R. Ramirez, R. Gonzalez +1
The phenomenally large enhancement in conductivity observed when Li-doped MgO crystals are oxidized at elevated temperatures was investigated by dc and ac electrical measurements i…
Strong covalent bonding between two graphene layers
P. L. de Andres, R. Ramirez, J. A. Verges
We show that two graphene layers stacked directly on top of each other (AA stacking) form strong chemical bonds when the distance between planes is 0.156 nm. Simultaneously, C-C in…
The phase diagram of ice Ih, II, and III: a quasi-harmonic study
R. Ramirez, N. Neuerburg, C. P. Herrero
The phase diagram of ice Ih, II, and III is studied by a quasi-harmonic approximation. The results of this approach are compared to phase diagrams previously derived by thermodynam…
Dynamics of finite dimensional non-hermitian systems with indefinite metric
R. Ramirez, M. Reboiro
We discuss the time evolution of physical finite dimensional systems which are modelled by non-hermitian Hamiltonians. We address both general non-hermitian Hamiltonians and pseudo…