Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-10-15
Phys. Rev. E 81, 036206 (2010)
Physics
Condensed Matter
Statistical Mechanics
11 pages, 16 figures
Scientific paper
10.1103/PhysRevE.81.036206
By means of full exact diagonalization, we study level statistics and the structure of the eigenvectors of one-dimensional gapless bosonic and fermionic systems across the transition from integrability to quantum chaos. These systems are integrable in the presence of only nearest-neighbor terms, whereas the addition of next-nearest neighbor hopping and interaction may lead to the onset of chaos. We show that the strength of the next-nearest neighbor terms required to observe clear signatures of nonintegrability is inversely proportional to the system size. Interestingly, the transition to chaos is also seen to depend on particle statistics, with bosons responding first to the integrability breaking terms. In addition, we discuss the use of delocalization measures as main indicators for the crossover from integrability to chaos and the consequent viability of quantum thermalization in isolated systems.
Rigol Marcos
Santos Lea F.
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