PMID- 11290209
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20010524
LR  - 20031031
IS  - 0031-9007 (Print)
IS  - 0031-9007 (Linking)
VI  - 86
IP  - 8
DP  - 2001 Feb 19
TI  - Nature of spin excitations in two-dimensional mott insulators: undoped cuprates 
      and other materials.
PG  - 1626-9
AB  - We investigate the excitation spectrum of a two-dimensional resonating valence 
      bond (RVB) state. Treating the pi-flux phase with antiferromagnetic correlations 
      as a variational ground state, we recover the long wavelength magnon as an "RVB 
      exciton." However, this excitation does not exhaust the entire spectral weight 
      and the high-energy spectrum is dominated by fermionic excitations. The latter 
      can be observed directly by inelastic neutron scattering, and we predict their 
      characteristic energy scales along different high symmetry directions in the 
      magnetic Brillouin zone. We also interpret experimental results on two magnon 
      Raman scattering and midinfrared absorption within this scenario.
FAU - Ho, C M
AU  - Ho CM
AD  - Department of Applied Physics, University of Tokyo, Japan.
FAU - Muthukumar, V N
AU  - Muthukumar VN
FAU - Ogata, M
AU  - Ogata M
FAU - Anderson, P W
AU  - Anderson PW
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Phys Rev Lett
JT  - Physical review letters
JID - 0401141
EDAT- 2001/04/06 10:00
MHDA- 2001/04/06 10:01
CRDT- 2001/04/06 10:00
PHST- 2000/09/11 00:00 [received]
PHST- 2001/04/06 10:00 [pubmed]
PHST- 2001/04/06 10:01 [medline]
PHST- 2001/04/06 10:00 [entrez]
AID - 10.1103/PhysRevLett.86.1626 [doi]
PST - ppublish
SO  - Phys Rev Lett. 2001 Feb 19;86(8):1626-9. doi: 10.1103/PhysRevLett.86.1626.