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Ground-State Structures of Ice at High-Pressures
High-Pressures Ground-State Structures Ice
2011/9/13
Ab initio random structure searching based on density functional theory is used to determine the ground-state structures of ice at high pressures. Including estimates of lattice zero-point energies,ic...
Many-body spin interactions and the ground state of a dense Rydberg lattice gas
Many-body spin interactions ground state dense Rydberg lattice gas
2010/11/11
We study a one-dimensional atomic lattice gas in which Rydberg atoms are excited by a laser and whose external dynamics is frozen. We identify a parameter regime in which the Hamiltonian is well-appr...
Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons
Hamiltonian Ground state approximation Vacuum state
2010/4/9
In this paper a variational study of a tunnelling exciton (Frenkel exciton) coupled to an arbitrary number of phonon modes is presented. The results of our model are presented both for weak non-adiaba...