科研之友
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摘要
Mott insulator to metal transitions under an electric field are currently the subject of numerous fundamental and applied studies. This puzzling effect, which involves nontrivial out-of-equilibrium effects in correlated systems, is indeed at play in the operation of a new class of electronic memories, the %26quot;Mott memories.%26quot; However, the combined electronic and thermal effects are difficult to disentangle in Mott insulators undergoing such transitions. We report here a comparison between the properties under an electric field of a canonical Mott insulator and a model built on a realistic two-dimensional resistor network able to capture both thermal effects and electronic transitions. This comparison made specifically on the family of narrow gap Mott insulators AM(4)Q(8), (A = Ga or Ge; M = V, Nb or Ta; and Q = S or Se) unambiguously establishes that the resistive transition experimentally observed under an electric field arises from a purely electronic mechanism.
- 出版日期2014-7-30
