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首页> 外文期刊>Computer physics communications >GPUQT: An efficient linear-scaling quantum transport code fully implemented on graphics processing units
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GPUQT: An efficient linear-scaling quantum transport code fully implemented on graphics processing units

机译:GPUQT:在图形处理单元上完全实现的高效线性缩放量子传输代码

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We present GPUQT, a quantum transport code fully implemented on graphics processing units. Using this code, one can obtain intrinsic electronic transport properties of large systems described by a real-space tight-binding Hamiltonian together with one or more types of disorder. The DC Kubo conductivity is represented as a time integral of the velocity auto-correlation or a time derivative of the mean square displacement. Linear scaling (with respect to the total number of orbitals in the system) computation time and memory usage are achieved by using various numerical techniques, including sparse matrix-vector multiplication, random phase approximation of trace, Chebyshev expansion of quantum evolution operator, and kernel polynomial method for quantum resolution operator. We describe the inputs and outputs of GPUQT and give a few examples to demonstrate its usage, paying attention to the interpretations of the results.
机译:我们呈现GPUQT,在图形处理单元上完全实现的量子传输代码。 使用该代码,可以获得由真实空间紧密汉密尔顿人与一种或多种类型的无序描述的大型系统的内在电子传输特性。 DC Kubo电导率表示为速度自相关的时间积分或均方位移的时间衍生。 线性缩放(关于系统中的轨道总数)通过使用各种数值技术来实现计算时间和存储器使用,包括稀疏矩阵 - 向量乘法,痕迹的随机相位近似,量子演化运算符的Chebyshev扩展,以及内核 量子分辨率运算符的多项式方法。 我们描述了GPUQT的输入和输出,并给出了一些例子来证明其使用,请注意结果的解释。

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