Unconventional Spin Density Waves in Dipolar Fermi Gases
| Autor: | Bhongale, S. G., Mathey, L., Tsai, Shan-Wen, Clark, Charles W., Zhao, Erhai |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 87, 043604 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.87.043604 |
| Popis: | The conventional spin density wave (SDW) phase (Overhauser, 1962), as found in antiferromagnetic metal for example (Fawcett 1988), can be described as a condensate of particle-hole pairs with zero angular momentum, $\ell=0$, analogous to a condensate of particle-particle pairs in conventional superconductors. While many unconventional superconductors with Cooper pairs of finite $\ell$ have been discovered, their counterparts, density waves with non-zero angular momenta, have only been hypothesized in two-dimensional electron systems (Nayak, 2000). Using an unbiased functional renormalization group analysis, we here show that spin-triplet particle-hole condensates with $\ell=1$ emerge generically in dipolar Fermi gases of atoms (Lu, Burdick, and Lev, 2012) or molecules (Ospelkaus et al., 2008; Wu et al.) on optical lattice. The order parameter of these exotic SDWs is a vector quantity in spin space, and, moreover, is defined on lattice bonds rather than on lattice sites. We determine the rich quantum phase diagram of dipolar fermions at half-filling as a function of the dipolar orientation, and discuss how these SDWs arise amidst competition with superfluid and charge density wave phases. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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