71 citations · 208 across the 8 of their papers we have counts for
4 papers · 1 filter
Adiabatic-antiadiabatic crossover in a spin-Peierls chain
R. Citro, E. Orignac, T. Giamarchi
We consider an XXZ spin-1/2 chain coupled to optical phonons with non-zero frequency . In the adiabatic limit (small ), the chain is expected to spontaneously dimerize an…
Magnetostriction in an array of spin chains under magnetic field
E. Orignac, R. Citro
We consider an array of XX spin-1/2 chains coupled to acoustic phonons and placed in a magnetic field. Treating the phonons in the mean field approximation, we show that this syste…
Mean Field theory of the spin-Peierls transition
E. Orignac, R. Chitra
We revisit the problem of the spin-Peierls instability in a one dimensional spin-1/2 chain coupled to phonons. The phonons are treated within the mean field approximation. We use b…
Quantitative expression of the spin gap via bosonization for a dimerized spin-1/2 chain
Edmond Orignac
Using results on the mass gap in the sine-Gordon model combined with the exact amplitudes in the bosonized representation of the Heisenberg spin-1/2 chain and one-loop renormalizat…