论文标题
电压偏置的莫特绝缘子的非平衡热状态
Nonequilibrium thermal state of a voltage-biased Mott insulator
论文作者
论文摘要
我们在三个维度上建立了电压驱动的抗铁磁莫特绝缘子的非平衡热相，在电压偏置下在稳态下实现。从一半填充的哈伯德模型的Keldysh动作开始，我们为“慢速”磁变量得出了有效的Langevin方程。电子与这些自由度的耦合决定了传输特性。在低温下，我们发现电压驱动的不连续的绝缘子 - 金属转变以及磁滞。我们绘制了Néel温度的抑制$ T_N $和PSEUDOGAP温度$ t_ {pg} $随着电压的增加，并发现有偏见的莫特绝缘子具有有限的温度绝缘器 - 金属过渡。低温结果解决了有关滞后的实验难题，并且热结果使光谱和非线性转运进行了可测试的预测。
We establish the nonequilibrium thermal phases of a voltage driven antiferromagnetic Mott insulator in three dimensions, realised at steady state under a voltage bias. Starting from the Keldysh action for the half filled Hubbard model we derive an effective Langevin equation for the `slow' magnetic variables. The coupling of electrons to these degrees of freedom determine the transport properties. At low temperature we find a voltage-driven discontinuous insulator-metal transition, along with hysteresis. We map the suppression of the Néel temperature $T_N$ and pseudogap temperature $T_{pg}$ with increasing voltage, and discover that the biased Mott insulator has a finite temperature insulator-metal transition. The low temperature results resolve an experimental puzzle about hysteresis, and the thermal results make testable predictions on spectra and nonlinear transport.
