Comments on Quantum Higgs Vacua
  We study two-dimensional N=(4,4) supersymmetric gauge theories which do not have classical Higgs branches, but are believed to have isolated quantum Higgs vacua. We provide arguments for the existence of such vacua based on brane dynamics in string theory and the supersymmetric partition sums of the gauge theories. 
Jeffrey A. Harvey, David Kutasov and Sungjay Lee
hep-th