|
|
|
|
Forthcoming Seminars at F-1
Friday
22 Jun 2018
13:00 | Yicheng Zhang | Information measures for a local quantum phase transition:
Lattice fermions in a one-dimensional harmonic trap |
|---|
We use quantum information measures to study the local quantum phase transition that occurs for trapped
spinless fermions in one-dimensional lattices. We focus on the case of a harmonic confinement~[1]. The transition
occurs upon increasing the characteristic density and results in the formation of a band-insulating domain in the
center of the trap. We show that the ground-state bipartite entanglement entropy can be used as an order parameter
to characterize this local quantum phase transition.We also study excited eigenstates by calculating the average von
Neumann and second Renyi eigenstate entanglement entropies, and compare the results with the thermodynamic
entropy and the mutual information of thermal states at the same energy density. While at low temperatures we
observe a linear increase of the thermodynamic entropy with temperature at all characteristic densities, the average
eigenstate entanglement entropies exhibit a strikingly different behavior as functions of temperature below and
above the transition. They are linear in temperature below the transition but exhibit activated behavior above it.
Hence, at nonvanishing energy densities above the ground state, the average eigenstate entanglement entropies
carry fingerprints of the local quantum phase transition.
[1] Zhang, Vidmar and Rigol, Phys. Rev. A 97, 023605 (2018)
F1 tea room. |
Seminars Archive
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
21 Nov 2017
15:00 | Jan Skolimowski | Zigzag-chain domain walls facilitate metalisation of the Mott insulator on a triangular lattice |
|---|
| cajna soba f1 |
24 Oct 2017
11:00 | Friedrich Krien | Conservation in strongly correlated systems - A practical viewpoint |
|---|
| Cajna soba F-1 |
10 Oct 2017
11:00 | Denis Golez | Manipulation of band gap upon photoexcitation of an excitonic insulator |
|---|
| cajna soba f1 |
27 Jun 2017
15:00 | Ana Vranic | Thermodynamics and electron transport on a triangular lattice - comparison between Lanczos and DMFT |
|---|
| Cajna soba f1. |
4 Apr 2017
15:00 | Rok Zitko | Infinite U Hubbard model in infinite dimensions: transport in the low-T regime |
|---|
| cajna soba f1 |
22 Mar 2017
15:00 | Markus Aichhorn | Strong Correlations and Spin-Orbit Coupling: From Materials to Models |
|---|
| Cajna soba F1 |
7 Mar 2017
15:00 | Alen Horvat | Spin-orbit coupling in multi-orbital impurity models and its relevance for transition metal-oxides |
|---|
| Cajna soba F1 |
26 Jan 2017
14:00 | Daniel Bauernfeind | Fork Tensor Product States - Efficient Three Orbital Real Time DMFT Solver |
|---|
| cajna soba f1 |
|
|
|
|
|
|
