b'@techreport{DeSimoneDiehlJuengerMutzelReineltRinaldi96a,'b'\nTITLE = {Exact ground states of two-dimensional \\${\\textbackslash}pm J\\$ Ising Spin Glasses},\nAUTHOR = {De Simone, C. and Diehl, M. and J{\\"u}nger, Michael and Mutzel, Petra and Reinelt, Gerhard and Rinaldi, G.},\nLANGUAGE = {eng},\nURL = {http://domino.mpi-inf.mpg.de/internet/reports.nsf/NumberView/1996-1-004},\nNUMBER = {MPI-I-1996-1-004},\nINSTITUTION = {Max-Planck-Institut f{\\"u}r Informatik},\nADDRESS = {Saarbr{\\"u}cken},\nYEAR = {1996},\nDATE = {1996},\nABSTRACT = {In this paper we study the problem of finding an exact ground state of a two-dimensional $\\pm J$ Ising spin glass on a square lattice with nearest neighbor interactions and periodic boundary conditions when there is a concentration $p$ of negative bonds, with $p$ ranging between $0.1$ and $0.9$. With our exact algorithm we can determine ground states of grids of sizes up to $50\\times 50$ in a moderate amount of computation time (up to one hour each) for several values of $p$. For the ground state energy of an infinite spin glass system with $p=0.5$ we estimate $E_{0.5}^\\infty = -1.4015 \\pm0.0008$. We report on extensive computational tests based on more than $22\\,000$ experiments.},\nTYPE = {Research Report / Max-Planck-Institut f\xc3\xbcr Informatik},\n}\n'