<h4 align="center">WIGNER SZFI SZEMINÁRIUM</h4>
<h2 align="center">SALVATORE MANMANA</h2>
<p align="center">(Institute for Theoretical Physics, University of Göttingen, vendéglátó: Legeza Örs)</p>
<h2 align="center">"Recent developments for finite-temperature dynamics with matrix product state approaches"</h2>
<p align="center">Időpont: 2015. október 13. (kedd) 10:00 (1 óra)<br>
Hely: MTA Wigner FK SZFI, I. épület 1. emeleti Tanácsterem</p>
<h3>Összefoglaló:</h3>
<p><span style="font-size: medium;"><span style="font-family: Times New Roman;">I will present recent developments for flexible matrix product state (MPS) approaches to calculate finite-temperature spectral functions of low-dimensional strongly correlated quantum systems. The main focus will be on the determination of these quantities directly in frequency space via a Liouvillian formulation of the resolvent, which combines the purification of the finite-temperature density operator with a moment expansion of the spectral functions of interest. The resulting algorithm does not specifically depend on the MPS formulation, but is applicable for any wave function based approach which can provide the purification of the density matrix, opening the way for further developments of numerical methods. Here, I will discuss its accuracy and efficiency for a specific MPS based formulation. More specifically, I will show results for finite-temperature properties of dynamical spectral functions of various spin chains, in particular systems with Dzyaloshinskii - Moriya interactions caused by spin-orbit coupling under the influence of magnetic fields, and dimerized chains. The goal is to analyze the effect of the symmetry breaking interactions on the nature of the finite-temperature dynamic spin structure factor as obtained in ESR and neutron scattering experiments. </span></span></p>
<p><b>Részletes információ:</b>
<a href="http://www.szfki.hu/seminar">http://www.szfki.hu/seminar</a></p>
<h4 align="center">Minden érdeklődőt szívesen látunk!</h4><p align="center">Asbóth János<br>szfi-seminar@wigner.mta.hu</p><p> </p>