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        <span style="font-size:14px;">Dear QE developers and users,</span> 
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        <span style="font-size:14px;">  Hi, I want to calculate the 
piezoelectric stress tensor (e.g. E333 instead of D333) using Quantum 
ESPRESSO code in order to verify the correctness of the dynamic 
quadrupole tensor. However, when I did a Google search, I didn't find 
what I was looking for, and all of the solutions were almost a decade or
 two old. As we all know, times are moving fast, and I believe QE code 
is evolving fast. Therefore, I would like to ask you, is there a more 
advanced and elegant solution to calculate the piezoelectric pressure 
tensor? Or can you provide a specific example of using Berry phase to 
calculate piezoelectric stress tensors?</span> 
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        <span style="font-size:14px;"> </span><span style="color:#2A2B2E;font-family:"PingFang SC", "Microsoft YaHei", 微软雅黑, 宋体, "Malgun Gothic", sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;-webkit-text-stroke-width:0px;background-color:#FCFDFE;text-decoration-thickness:initial;text-decoration-style:initial;text-decoration-color:initial;display:inline !important;float:none;"><span style="font-family:SimSun;font-size:14px;">Tha</span><span style="font-family:SimSun;font-size:14px;">nk you very much for your help!</span></span> 
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        <span style="color:#2A2B2E;font-family:"PingFang SC", "Microsoft YaHei", 微软雅黑, 宋体, "Malgun Gothic", sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;-webkit-text-stroke-width:0px;background-color:#FCFDFE;text-decoration-thickness:initial;text-decoration-style:initial;text-decoration-color:initial;display:inline !important;float:none;"><span style="font-family:SimSun;font-size:14px;"><br>
</span></span> 
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        <span style="color:#2A2B2E;font-family:"PingFang SC", "Microsoft YaHei", 微软雅黑, 宋体, "Malgun Gothic", sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;-webkit-text-stroke-width:0px;background-color:#FCFDFE;text-decoration-thickness:initial;text-decoration-style:initial;text-decoration-color:initial;display:inline !important;float:none;"><span style="font-family:SimSun;font-size:14px;">-----------------------------------------------------------</span></span> 
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        <span style="color:#2A2B2E;font-family:"PingFang SC", "Microsoft YaHei", 微软雅黑, 宋体, "Malgun Gothic", sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;-webkit-text-stroke-width:0px;background-color:#FCFDFE;text-decoration-thickness:initial;text-decoration-style:initial;text-decoration-color:initial;display:inline !important;float:none;"><span style="font-family:SimSun;font-size:14px;">Tsiayi Gong                Chengdu University of Technology</span></span> 
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