<span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">> How can we exert a shear force?</span><br clear="all">A short list of readings<div><br><div>Introduction to Solid State Physics, C. Kittel, </div>
<div>Theory of Elasticity, Landau &Lifshits</div><div><br></div><div>For simulation with Quantum ESPRESSO, you define a strain and the code calculates stress.</div><div>You must obtain a relaxed structure (calculation='vc-relax'), then you apply deformations to the lattice vectors, but relaxing the atom positions (calculation='relax')</div>
<div><br></div><div><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; "> One simple example of how to deform the lattice vectors is explained in </span></div>
<div><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; "></span><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; ">J. Appl. Phys. 99, 103504 (2006). See also</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: 12px; color: rgb(51, 51, 51); "> Phys Rev B 1995; 51: 17431.</span></div>
<div><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; "><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">
<br></p><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"><br></p></span></div><div><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; ">An explanation on the theory of ab initio stress calculations is in </span></div>
<div><span class="Apple-style-span" style="font-family: 'Trebuchet MS', Tahoma, Arial; font-size: 12px; color: rgb(51, 51, 51); line-height: 18px; "><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">
Nielsen OH, Richard M. FirstPrinciples Calculation of Stress. Phys Rev Lett 1983;50: 697, and more detailed in PRB 32, 3780 (1985)</p></span></div><div><font class="Apple-style-span" color="#333333" face="'Trebuchet MS', Tahoma, Arial" size="3"><span class="Apple-style-span" style="font-size: 12px; line-height: 18px;"><br>
</span></font></div><div><font class="Apple-style-span" color="#333333" face="'Trebuchet MS', Tahoma, Arial" size="3"><span class="Apple-style-span" style="font-size: 12px; line-height: 18px;">Good luck</span></font></div>
<div>-- <br><div><br></div><div><br></div>Eduardo Menendez<br>Departamento de Fisica<br>Facultad de Ciencias<br>Universidad de Chile<br>Phone: (56)(2)9787439<br>URL: <a href="http://fisica.ciencias.uchile.cl/~emenendez" target="_blank">http://fisica.ciencias.uchile.cl/~emenendez</a><div>
<br></div><div>Let's pray for the 33 trapped miners! Four months to rescue.</div><br>
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