Spontaneous Fermi surface symmetry breaking on a square lattice

✍ Scribed by H. Yamase; V. Oganesyan; W. Metzner

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 297 KB
• Volume: 378-380
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.01.052

✦ Synopsis

We analyze a forward scattering model on a square lattice, which exhibits spontaneous Fermi surface symmetry breaking with a d-wave order parameter: the Fermi surface expands along the k x -axis and shrinks along the k y -axis or vice versa. While the transition is usually first order as a function of chemical potential at low temperature, we find that Fermi surface fluctuations near the transition can be strong. For a particularly favorable but not unphysical choice of parameters, the first-order transition is completely suppressed, leading to a quantum critical point.