<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hello,<div class=""><br class=""></div><div class="">Yes, the code can handle 2d systems.</div><div class="">Yes, to use it you just have to specify the lattice.</div><div class=""><br class=""></div><div class="">Which sizes do you want to run?</div><div class="">Unfortunately running higher dimensional DMRG simulations is a highly non trivial task.</div><div class="">Special care has to be taken for understanding the convergence with respect to the number of sweeps and the MPS bond dimension.</div><div class="">For an example on how to treat it for “just ladders”, you can have a look here: <a href="https://doi.org/10.1103/PhysRevB.92.195139" class="">https://doi.org/10.1103/PhysRevB.92.195139</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">Michele</div><div class=""><br class=""></div><div class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 6 Jul 2017, at 06:32, H <<a href="mailto:w.boson@gmail.com" class="">w.boson@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Dear Michele or others,<div class=""><br class=""></div><div class="">In your paper (arXiv:1407.0872)'s abstract you mentioned the MPS code can handle 2D system. Is it as simple as setting the 'LATTICE' parameter to "open square lattice", or do I need to build a custom 1D lattice with long-range coupling?</div><div class=""><br class=""></div><div class="">I tried setting 'LATTICE' to "open square lattice" but the results seems different from my ED result. The system is spinful fermionic. Could it be due to fermion signs not properly taken care of internally?</div><div class=""><br class=""></div><div class="">Ultimately I need to simulate a small 3D system (3x3x3). Can I use the internal cubic lattice or do I need to build a custom 1D lattice with long-range coupling?</div></div>
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