Resummation of fluctuations near ferromagnetic quantum critical points
Resummation of fluctuations near ferromagnetic quantum critical points
复制标题
铁磁量子临界点附近涨落的恢复
DOI:
10.1103/physrevb.88.165109
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发表时间:
2013
影响因子:
3.7
通讯作者:
Pedder C
中科院分区:
文献类型:
--
作者:
Pedder C
We present a detailed analysis of the nonanalytic structure of the free energy for the itinerant ferromagnet near the quantum critical point in two and three dimensions. We analyze a model of electrons with an isotropic dispersion interacting through a contact repulsion. A fermionic version of the quantum order-by-disorder mechanism allows us to calculate the free energy as a functional of the dispersion in the presence of homogeneous and spiraling magnetic order. We resum the leading divergent contributions to derive an algebraic expression for the nonanalytic contribution to free energy from quantum fluctuations. Using a recursion which relates subleading divergences to the leading term, we calculate the fullcontribution in. We propose an interpolating functional form, which allows us to track phase transition lines at temperatures far below the tricritical point and down to. In, quantum fluctuations are stronger, and nonanalyticities are more severe. Using a similar resummation approach, we find that despite the different nonanalytic structures, the phase diagrams in two and three dimensions are remarkably similar, exhibiting an incommensurate spiral phase near the avoided quantum critical point.
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影响因子:
3.7
作者:
Thomson S
通讯作者:
Thomson S
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
M. Otero;F. Rivadulla;Garcı́a;A. Piñeiro;V. Pardo;D. Baldomir;J. Rivas
通讯作者:
J. Rivas
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
F. Kruger;S. Scheidl
通讯作者:
S. Scheidl
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
P. A. Igoshev;V. Irkhin;A. Katanin
通讯作者:
A. Katanin
DOI:
--
发表时间:
1991
期刊:
Physical Review B (Condensed Matter)
影响因子:
--
作者:
Milá;Poilblanc;Bruder
通讯作者:
Bruder