Strong Interaction Effects in Superfluid Ising Quantum Phase Transition
| Autor: | Zheng, Wei, Liu, Boyang, Miao, Jiao, Chin, Cheng, Zhai, Hui |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 113, 155303 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.113.155303 |
| Popis: | We study the quantum phase transition between a normal Bose superfluid to one that breaks additional Z_2 Ising symmetry. Using the recent shaken optical lattice experiment as an example, we first show that at mean-field level atomic interaction can significantly shift the critical point. Near the critical point, bosons can condense into a momentum state with high or even locally maximum kinetic energies due to interaction effect. Then, we present a general low-energy effective field theory that treats both the superfluid transition and the Ising transition in a uniform framework, and identify a quantum tricritical point separating normal superfluid, Z_2 superfluid and Mott insulator. Using perturbative renormalization group method, we find that the quantum phase transition belongs to a unique universality class that is different from that of a dilute Bose gas. Comment: 12 pages and 7 figures including supplementary materials |
| Databáze: | arXiv |
| Externí odkaz: |
|