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yangboasdf

新虫 (初入文坛)

[求助] ATK计算I-V曲线怎么只有一个点?

刚刚学习ATK,想计算I-V特性,为什么算完之后I-V曲线上只有一个点啊?
左右电极分别是2V和-2V。

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guohuazhong

至尊木虫 (职业作家)

【答案】应助回帖

感谢参与,应助指数 +1
在device calculator后面加上
for bias in numpy.linspace(-0.2,0.2,3)*Volt:   # this is added by guohuazhong
#    device_configuration.setCalculator(calculator)  ## this line should be revised for loop calculations
                device_configuration.setCalculator(
    calculator(electrode_voltages=(0.5*bias,-0.5*bias)),
    initial_state=device_configuration
    )
                nlprint(device_configuration)
                device_configuration.update()
#    nlsave('C:/Documents and Settings/ghz/VNL/lih2li_iv_scf_%g.nc' % bias.inUnitsOf(Volt), device_configuration) # write every scf step separately
                nlsave('C:/Documents and Settings/ghz/VNL/ghz-device-transmission.nc', device_configuration)  # write all the scf steps in one file
               
                    # ... calculate and save the transmission spectrum,
                transmission_spectrum = TransmissionSpectrum(
                configuration=device_configuration,
                energies=numpy.linspace(-5,5,401)*eV,
                kpoints=MonkhorstPackGrid(3,3)
                )
                nlsave('C:/Documents and Settings/ghz/VNL/ghz-transmission.nc',transmission_spectrum)
里面的数值自己修改就可以了
3楼2012-03-30 11:03:31
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amberkaka

木虫 (初入文坛)

【答案】应助回帖

★ ★
感谢参与,应助指数 +1
fzx2008: 金币+2, 谢谢指教 2012-03-30 00:03:41
设置了电极的电压值后算出的是所设的那个电压下对应的电流,所以只有一个点。
如果想算一条I-V曲线的话,应用一个脚本对不同的电压值进行循环计算,得出不同电压下对应的电流,再画图。tutorial里的Device Configurations里的第5章I-V CHARACTERISTIC里有教。
2楼2012-03-29 17:26:42
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