Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session A34: Petascale Science and Beyond: Applications and Opportunities for Materials, Chemical, and Bio Physics I
8:00 AM–11:00 AM,
Monday, March 5, 2018
LACC Room: 409A
Sponsoring Units: DCOMP DCMP DMP DCP
Chair: Nichols Romero, Leadership Computing Facility, Argonne National Laboratory
Abstract: A34.00013 : Ground state critical exponents in disordered XYZ spin chain*
10:48 AM–11:00 AM
We perform a study of the XYZ spin chain model with random independently distributed couplings. We focus on the critical line between x and y Ising antiferromagnetic phases, given by identical x and y distributions with a z-coupling distribution of varying bandwidth. In this way one can tune between the free-fermion fixed point and the multicritical point with identically distributed couplings in all directions. Using a new unbiased numerically exact method called rigorous renormalization group (RRG) we target the ground state physics, focusing on evaluating critical exponents, which have been proposed to vary continuously along the critical line between the XY and statistically isotropic XYZ points based on quantities computed using strong disorder RG schemes. Similarly, we investigate the critical line between the U(1) symmetric XX point and the anisotropic XY point.
*This work was supported by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center, with support of the Gordon and Betty Moore Foundation.
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