Reentrant random quantum Ising antiferromagnet
P. Lajkó, J. Ch. Anglès d'Auriac, Heiko Rieger, F. Iglói
,
We consider the quantum Ising chain with uniformly distributed random antiferromagnetic couplings (1 ≤
Ji ≤ 2) and uniformly distributed random transverse fields (Γ0 ≤ Γi ≤ 2Γ0) in the presence of a homogeneous
longitudinal field, h. Using different numerical techniques (density-matrix renormalization group, combinatorial
optimization, and strong disorder renormalization group methods) we explore the phase diagram, which consists
of an ordered and a disordered phase. At one end of the transition line (h = 0, Γ0 = 1) there is an infinite
disorder quantum fixed point, while at the other end (h = 2, Γ0 = 0) there is a classical random first-order
transition point. Close to this fixed point, for h > 2 and Γ0 > 0 there is a reentrant ordered phase, which is the
result of quantum fluctuations by means of an order through disorder phenomenon.
[1] P. Lajkó, J. Ch. Anglès d'Auriac, H. Rieger and F. Iglói Reentrant Random Quantum Ising Antiferromagnet |
Phys. Rev. B 101, 024203 (2020)
|
[pdf], [arXiv]
|
Legal notice (Impressum)
Privacy policy