Coherence properties of holes subject to a fluctuating spin chirality
- Superconductivity Research Center, Cambridge University, Madingley Road, Cambridge CB3 0HE, United Kingdom (GB)
- TCM Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, (United Kingdom)
The coherence properties of holes coupled to short-ranged chiral spin fluctuations with a characteristic chiral spin fluctuation time {tau}{sub ch}={omega}{sub ch}{sup {minus}1} are investigated in two dimensions. At temperatures {ital kT}{much lt}4{pi}{sup 2}{l angle}{phi}{sup 2}{r angle}{sup {minus}1}{h bar}{omega}{sub ch} hole quasiparticles exist and propagate with a renormalized mass {ital m}{sup *}/{ital m}=1+{l angle}{phi}{sup 2}{r angle}{h bar}/16{pi}{ital ma}{sub 0}{sup 2}{omega}{sub ch}. $langle phi sup 2 rangle--- is the amplitude of the local fictitious flux fluctuation and {ital a}{sub 0} is a lattice cutoff. At temperatures {ital kT}{much gt}4{pi}{sup 2}{l angle}{phi}{sup 2}{r angle}{sup {minus}1}{h bar}{omega}{sub ch} an effective-mass approximation is invalid and we find that the hole diffuses according to a {ital logarithmic} diffusion law in the quasistatic chiral field. The unusual diffusion law is a consequence of the long-ranged nature of the gauge field. The result shows that the holes do not form a coherent quantum fluid in the quasistatic regime.
- OSTI ID:
- 5661965
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 43:7; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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