Semantic Scholar
Open Access
2006
57 sitasi
Flat spin-wave dispersion in a triangular antiferromagnet
O. Starykh
A. Chubukov
A. Abanov
Abstrak
The excitation spectrum of an $S=1∕2$ two-dimensional triangular quantum antiferromagnet is studied using $1∕S$ expansion. Due to the noncollinearity of the classical ground state significant and nontrivial corrections to the spin-wave spectrum appear already in the first order in $1∕S$ in contrast to the square lattice antiferromagnet. The resulting magnon dispersion is almost flat in a substantial portion of the Brillouin zone. Our results are in quantitative agreement with recent series expansion studies by Zheng et al. [Phys. Rev. Lett. 96, 057201 (2006); cond-mat/0608008 (unpublished)].
Topik & Kata Kunci
Penulis (3)
O
O. Starykh
A
A. Chubukov
A
A. Abanov
Akses Cepat
Informasi Jurnal
- Tahun Terbit
- 2006
- Bahasa
- en
- Total Sitasi
- 57×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1103/PhysRevB.74.180403
- Akses
- Open Access ✓