McArdle George, Lerner Igor V
School of Physics and Astronomy, University of Birmingham, B15 2TT, Birmingham, UK.
Sci Rep. 2021 Dec 21;11(1):24293. doi: 10.1038/s41598-021-03668-z.
In order to observe many-body localisation in electronic systems, decoupling from the lattice phonons is required, which is possible only in out-of-equilibrium systems. We show that such an electron-phonon decoupling may happen in suspended films and it manifests itself via a bistability in the electron temperature. By studying the electron-phonon cooling rate in disordered, suspended films with two-dimensional phonons, we derive the conditions needed for such a bistability, which can be observed experimentally through hysteretic jumps of several orders of magnitude in the nonlinear current-voltage characteristics. We demonstrate that such a regime is achievable in systems with an Arrhenius form of the equilibrium conductivity, while practically unreachable in materials with Mott or Efros-Shklovskii hopping.
为了观测电子系统中的多体局域化，需要与晶格声子解耦，而这只有在非平衡系统中才有可能实现。我们表明，这种电子 - 声子解耦可能发生在悬浮薄膜中，并且通过电子温度的双稳性表现出来。通过研究具有二维声子的无序悬浮薄膜中的电子 - 声子冷却速率，我们推导出这种双稳性所需的条件，这可以通过非线性电流 - 电压特性中几个数量级的滞后跳变在实验中观测到。我们证明，在具有阿仑尼乌斯形式平衡电导率的系统中可以实现这种状态，而在具有莫特或埃弗罗斯 - 什克洛夫斯基跳跃的材料中实际上无法达到。
