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Quantum phase transitions and the degree of nonidentity in the system with two different species of vector bosons

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We address the system with two species of vector bosons in an optical lattice. In addition to the the standard parameters characterizing such a system, we are dealing here with… Click to show full abstract

We address the system with two species of vector bosons in an optical lattice. In addition to the the standard parameters characterizing such a system, we are dealing here with the "degree of atomic nonidentity", manifesting itself in the difference of tunneling amplitudes and on-site Coulomb interactions. We obtain a cascade of quantum phase transitions occurring with the increase in the degree of atomic nonidentity. In particular, we show that the phase diagram for strongly distinct atoms is qualitatively different from that for (nearly) identical atoms considered earlier. The resulting phase diagrams evolve from the images similar to the "J. Mir\'o-like paintings" to "K. Malewicz-like" ones.

Keywords: nonidentity; phase; system; system two; species vector; vector bosons

Journal Title: New Journal of Physics
Year Published: 2018

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