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Chair: Lev Vidmar

  • Invited talk

Andrew George Green: Phase Transitions in the Classical Simulability of Open Quantum Systems

We introduce a Langevin unravelling of the density matrix evolution of an open quantum system over matrix product states, which we term the time-dependent variational principle-Langevin equation. This allows the study of entanglement dynamics as a function of both temperature and coupling to the environment. As the strength of coupling to and temperature of the environment is increased, we find a transition where the entanglement of the individual trajectories saturates, permitting a classica...

  • Invited talk

Till Domröse: Light-induced hexatic state observed by ultrafast nanobeam diffraction

Quantum materials are characterised by enhanced correlations between their microscopic degrees of freedom that favor the occurence of exciting physical properties that are tunable by optical excitation, including the formation of charge-density waves (CDWs). The investigation of the dynamics following such an optical quench is available in ultrafast transmission electron microscopes (UTEMs), versatile tools that combine nanometer spatial with femtosecond temporal resolution (Fig. 1a).Here, we...

  • Contributed talk

Anze Mraz: Switching of the nanocryotron-driven ‌charge configuration memristor in real time

To improve the field of superconducting computer systems, a low-power, fast and durable memory device that is compatible with the single-flux-quantum (SFQ) logic is needed. Here we report on recent progress in the development of a so-called parallelotron (pTron) device that comprises a superconducting three-terminal amplifying nanowire cryotron (nTron) and a charge configuration memristor (CCM) based on 1T-TaS2. Besides the current-voltage characteristics and read operation, we also record sw...

Coffee Break

Chair: Federico Cilento

  • Invited talk

Tomaz Mertelj: Unconventional photo-induced charge-density-wave dynamics ‌in 2H-NbSe2 compared to the conventional in 1T-VSe2

We investigated temperature dependent ultrafast near-infrared transient reflectivity dynamics in coexisting superconducting (SC) and charge density wave (CDW) phases of layered 2H-NbSe2 using NIR and visible excitations. With visible pump-photon excitation (400 nm) we find a slow high-energy quasiparticle relaxation channel which is present in all phases. In the CDW phase, we observe a distinctive transient response component. The component is marked by the absence of coherent amplitude mode ...

  • Contributed talk

Manuel Tuniz: Manipulation of the charge-density-wave in VTe2 ‌by femtosecond light pulses

By combining time and angle-resolved photoemission spectroscopy (tr-ARPES) and broadband time-resolved optical spectroscopy (TR-OS) we investigate the effect of an optical excitation on the electronic and structural properties of the charge-density wave (CDW) system VTe2. Recently, the modification of the material’s electronic structure induced by CDW formation has been discussed because the strongly orbital-dependent changes may give rise to a topological change in specific bands.In our co...

  • Contributed talk

Iris Ulčakar: Iterative construction of conserved quantities ‌in dissipative nearly integrable systems

Integrable systems offer rare examples of solvable many-body problems in the quantum world. Due to the fine-tuned structure, their realization in nature and experiment is never completely accurate, therefore effects of integrability are observed only transiently. One way to surpass that is to couple nearly integrable systems to baths and driving: these will stabilize integrable effects up to arbitrary time, as encoded in the time dependent, and eventually, the stationary state of form of a ge...

  • Contributed talk

Jože Gašperlin: The interplay of lattice dynamics, stacking effects and Mott physics ‌in charge-density-wave systems

The transition metal dichalcogenide 1T-TaS2 is a layered compound that exhibits a series of increasingly commensurate charge density wave phases with decreasing temperature, including a low-temperature insulating phase. For a single 1T-TaS2 layer, with an odd number of electrons per Star-of-David cluster, the insulating behaviour may be attributed to Mott localisation. However, the stacking arrangement of multiple layers can lead to doubling of the unit cell, where the nature of the insulatin...

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