Electron Pumping under Non-Markovian Dissipation: The Role of the Self-Consistent Field
Electron Pumping under Non-Markovian Dissipation: The Role of the Self-Consistent Field
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DOI：
10.7566/jpsj.85.034803
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发表时间：
2016-02
影响因子：
1.7
通讯作者：
F. Grossmann;Atsunori Sakurai;Y. Tanimura
中科院分区：
文献类型：
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作者：
F. Grossmann;Atsunori Sakurai;Y. Tanimura
针对电子在周期性驱动共振隧穿二极管中的输运问题，研究了在静态无偏系统中施加具有相位差φ的对称性破缺交流外场时非零直流电流的产生.环境的影响进行了研究，使用系统浴哈密顿量表示的电子系统耦合到谐振子模式与德鲁德-洛伦兹谱密度。为了进行模拟，我们使用的分层运动方程的方法在维格纳表示，包括一个自洽构造的电场，确定从电子分布，使用泊松方程。结果表明，在相位差φ = π/2附近的最大抽运电流受体系-熔池耦合强度的强烈影响。如果忽略势的自洽部分，耗散的影响就会减弱。
Focusing on electron transport through a periodically driven resonant tunneling diode, we study the generation of a non-vanishing dc-current by applying symmetry breaking external ac fields with phase difference φ in a statically unbiased system. The effect of an environment is investigated using the system-bath Hamiltonian represented by the electron system coupled to harmonic oscillator modes with a Drude–Lorentz spectral density. To carry out simulations, we use the hierarchal equations of motion approach in the Wigner representation including a self-consistently constructed electric field that is determined from the electron distribution using the Poisson equation. We show that the maximal pumping current at a phase difference near φ = π/2 is strongly influenced by the system-bath coupling strength. The effect of dissipation is diminished if the self-consistent part of the potential is ignored.