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Strong-randomness infinite-coupling phase in a random quantum spin chain

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arxiv 1310.4864 v2 pith:SXN2ISNU submitted 2013-10-17 cond-mat.str-el cond-mat.dis-nn

Strong-randomness infinite-coupling phase in a random quantum spin chain

Fawaz Hrahsheh , Rajesh Narayanan , Jos\'e A. Hoyos , Thomas Vojta This is my paper
classification cond-mat.str-el cond-mat.dis-nn
keywords phasequantumchainrandomspinactsadditionashkin-teller
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the ground-state phase diagram of the Ashkin-Teller random quantum spin chain by means of a generalization of the strong-disorder renormalization group. In addition to the conventional paramagnetic and ferromagnetic (Baxter) phases, we find a partially ordered phase characterized by strong randomness and infinite coupling between the colors. This unusual phase acts, at the same time, as a Griffiths phase for two distinct quantum phase transitions both of which are of infinite-randomness type. We also investigate the quantum multi-critical point that separates the two-phase and three-phase regions; and we discuss generalizations of our results to higher dimensions and other systems.

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