Role of nonmagnetic disorder on the stability of the U(1) spin liquid: A renormalization group study
Abstrak
Recently, Hermele et al. claimed that the infrared (IR) fixed point of noncompact QED{sub 3} is stable against instanton excitations in the limit of large flavors of massless Dirac fermions [M. Hermele et al., cond-mat/0404751, Phys. Rev. B (to be published October 2004)]. We investigate an effect of nonmagnetic disorder on the deconfined quantum critical phase dubbed U(1) spin liquid (U1SL) in the context of quantum antiferromagnet. In the case of weak disorder the IR fixed point remains stable against the presence of both the instanton excitations and nonmagnetic disorder and thus the U1SL is sustained. In the case of strong disorder the IR fixed point becomes unstable against the disorder and the Anderson localization is expected to occur. We argue that in this case deconfinement of spinons does not occur since the Dirac fermion becomes massive owing to the localization.
Topik & Kata Kunci
Penulis (1)
Ki-Seok Kim
Akses Cepat
- Tahun Terbit
- 2004
- Bahasa
- en
- Total Sitasi
- 12×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1103/PhysRevB.70.140405
- Akses
- Open Access ✓