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Many-body interactions can produce novel ground states in a condensed-mattersystem. For example, interacting electrons and holes can spontaneously formexcitons, a neutral bound state, provided that the exciton binding energyexceeds the energy separation between the single particle states. Here wereport on electrical transport measurements on spatially separatedtwo-dimensional electron and hole gases with nominally degenerate energysubbands, realized in an InAs(10 nm)/GaSb(5 nm) coupled quantum well. Weobserve a narrow and intense maximum (~500 k\Omega) in the four-terminalresistivity in the charge neutrality region, separating the electron-like andhole-like regimes, with a strong activated temperature-dependence above T = 7 Kand perfect stability against quantizing magnetic fields. By quantitativelycomparing our data with early theoretical predictions, we show that suchunexpectedly large resistance in our nominally zero-gap semi-metal system isprobably due to the formation of an excitonic insulator state.

Evidence for an excitonic insulator phase in a zero-gap InAs/GaSb bilayer