Emergent Gauge Fields and their Condensation in Quantum Spin Liquids

          @misc{ scivideos_PIRSA:12050052,
            doi = {10.48660/12050052},
            url = {https://pirsa.org/12050052},
            author = {Baskaran, Ganapathy},
            keywords = {Quantum Matter},
            language = {en},
            title = {Emergent Gauge Fields and their Condensation in Quantum Spin Liquids},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2012},
            month = {may},
            note = {PIRSA:12050052 see, \url{https://scivideos.org/index.php/pirsa/12050052}}
          }
          

Abstract

Large quantum fluctuations in certain quantum spin systems destroy long range magnetic order such as antiferromagnetism. Resulting paramagnetic states are called a quantum spin liquids. These states support emergent gauge fields [1]. Under certain conditions, emergent gauge fields condense in the ground state, leading to a chiral spin liquid state [2]. A condensed `magnetic field' for example, correspond to presence of spontaneous circulating spin current or spin `chirality'[3]. In the light of recent search for spin liquids in frustrated quantum antiferromagnets, we revive our earlier approach and show that a variety of chiral spin liquid states are possible in 2D lattices.   [1] G. Baskaran and P.W. Anderson, Phys. Rev., B 37, 580 (1988) [2] V. Kalmeyer and R. B. Laughlin, Phys. Rev. Lett., 59, 2095 (1987) [3] X.-G. Wen, F. Wilczek and A. Zee, Phys. Rev., B 39, 11413 (1989) [4] G Baskaran, Phys. Rev. Lett., 63, 2524 (1989)