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Abstract: Inter-layer excitonic coherence in a quantum Hall bilayer with negligibletunneling is monitored by measurements of low-lying spin excitations. At $ u T=1$ new quasiparticle excitations are observed above a transition temperaturerevealing a competing metallic phase. For magnetic fields above an onset Zeemanenergy this metallic phase has full spin polarization. A phase diagram in theparameter space of temperature and Zeeman energy reveals that the transitiontemperature increases at higher fields. This unexpected result suggestsintriguing impacts of spin polarization in the highly correlated phases.



Author: Biswajit Karmakar, Vittorio Pellegrini, Aron Pinczuk, Loren N. Pfeiffer, Ken W. West

Source: https://arxiv.org/



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