标题： 量子点非线性输运中关联跳跃相互作用的特征 显示英文标题

标题： Signatures of the Correlated-Hopping Interaction in Non-Linear Transport through a Quantum Dot

摘要： 在库仑相互作用在凝聚态系统中起重要作用的情况下，除了局域的哈伯德型相互作用外，还期望存在其他依赖于站点占据情况的非局域项，这些项被称为关联或辅助跃迁。 尽管在与外部电极隧穿耦合的量子点中，这些项可能具有相当可观的幅度，但对这些系统的实验解释——通常在线性响应 regime 中——似乎不需要它们的存在。 然而，由于关联跃迁项破坏了标准安德森模型的粒子-空穴对称性，并修改了系统的所有输运特性，因此对其对可测量特性的影响的详细知识，特别是{\em 在非线性区域}，是其实验检测的前提条件。 在本文中，我们研究由隧穿耦合到外部电极的量子点组成的结的非线性输运特性。 我们通过带有局域哈伯德相互作用和非局域关联跃迁相互作用的单杂质安德森哈密顿量来模拟该系统。 利用之前找到的自旋依赖输运和谱格林函数的一般表达式以及电荷和热量输运的一般公式，我们在强非线性 regime 中计算相关的输运特性。 显示英文摘要

摘要： In condensed matter systems with the Coulomb interaction playing an important role one expects, besides the on-site (local) Hubbard-type interaction, that also other (non-local) terms depending on the site occupancy, known as correlated or assisted hopping, exist. Even though such terms in quantum dots tunnel coupled to external electrodes may have quite an appreciable amplitude, the interpretation of experiments on these systems -- usually in the linear response regime -- seems not to require their presence. However, since the correlated-hopping term breaks the particle-hole symmetry of the standard Anderson model and modifies all transport characteristics of the system, the detailed knowledge of its influence on measurable characteristics, especially {\em in the non-linear regime}, is a prerequisite for its experimental detection. In this paper, we study the non-linear transport properties of junctions composed of a quantum dot tunnel coupled to external electrodes. We model the system by the single-impurity Anderson Hamiltonian with Hubbard on-site interaction and with a non-local correlated-hopping interaction. Using the previously found general expression for the spin-dependent transport and spectral Green functions as well as general formulae for charge and heat transport, we calculate relevant transport characteristics in the strongly non-linear regime