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arXiv 1312.6038cond-mat.str-el
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分级量子Hall态的Hall粘性

Hall Viscosity of Hierarchical Quantum Hall States

M. Fremling, T. H. Hansson, J. Suorsa

摘要:

利用基于共形场论的方法,我们构造了阿贝尔量子Hall族中所有手征态在具有任意平坦度规的环面上的模型波函数。这些函数没有变分参数,它们在模群下以与Laughlin波函数的多分量推广相同的方式变换。假设在绝热变化的模块参数$τ$的Berry阶段的情况下,我们计算量子霍尔粘度,并发现它是在协议的公式,由阅读,其中涉及的粘度的平均轨道自旋的电子。对于填充因子$ν=2/5$ Jain状态,这是在第二层次中,我们比较我们的模型波函数与数值计算得到的库仑相互作用的最低朗道能级的哈密顿量的基态,并发现在复杂的$τ$ -平面的大区域非常好的协议。对于同一个例子,我们还数值计算霍尔粘度,发现与分析结果的模型波函数和数值得到的库仑波函数。我们认为,这支持广义等离子体类比的概念,将确保使用共形场论方法获得的波函数不收购贝里阶段绝热演化。

英文摘要:

Using methods based on conformal field theory, we construct model wave functions on a torus with arbitrary flat metric for all chiral states in the abelian quantum Hall hierarchy. These functions have no variational parameters, and they transform under the modular group in the same way as the multicomponent generalizations of the Laughlin wave functions. Assuming the absence of Berry phases upon adiabatic variations of the modular parameter $τ$, we calculate the quantum Hall viscosity and find it to be in agreement with the formula, given by Read, which relates the viscosity to the average orbital spin of the electrons. For the filling factor $ν=2/5$ Jain state, which is at the second level in the hierarchy, we compare our model wave function with the numerically obtained ground state of the Coulomb interaction Hamiltonian in the lowest Landau level, and find very good agreement in a large region of the complex $τ$-plane. For the same example, we also numerically compute the Hall viscosity and find good agreement with the analytical result for both the model wave function and the numerically obtained Coulomb wave function. We argue that this supports the notion of a generalized plasma analogy that would ensure that wave functions obtained using the conformal field theory methods do not acquire Berry phases upon adiabatic evolution.

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