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cond-mat.stat-mech2004
Hard squares with negative activity
Paul Fendley, Kareljan Schoutens, Hendrik van Eerten
We show that the hard-square lattice gas with activity z= -1 has a number of remarkable properties. We conjecture that all the eigenvalues of the transfer matrix are roots of unity…
cond-mat.str-el2004
Non-local space-time supersymmetry on the lattice
Xiao Yang, Paul Fendley
We show that several well-known one-dimensional quantum systems possess a hidden nonlocal supersymmetry. The simplest example is the open XXZ spin chain with Δ=-1/2. We use the sup…