Geometric frustration and dimensional reduction at a quantum critical point.
We show that the spatial dimensionality of the quantum critical point associated with Bose-Einstein condensation at T=0 is reduced when the underlying lattice comprises layers coupled by a frustrating interaction. Our theoretical predictions for the critical behavior correspond very well with recent measurements in BaCuSi(2)O(6) [ S. E. Sebastian et al., Nature (London) 441, 617 (2006)].
Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
C D
CD
Batista
J
J
Schmalian
N
N
Kawashima
P
P
Sengupta
S E
SE
Sebastian
N
N
Harrison
M
M
Jaime
I R
IR
Fisher