Events

Identifying an efficient pathway to change the order parameter via a subtle excitation of the coupled high-frequency mode is the ultimate goal of the field of ultrafast phase transitions . This is an especially interesting research direction in magnetism, where the coupling between spin and lattice excitations is required for magnetization reversal . Despite several attempts however, the switching between magnetic states via resonant pumping of phonon modes has not yet beendemonstrated.To pr...

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Optical control of magnetization in numerous ferro and ferrimagnets has been demonstrated in recent years. While the absence of stray fields, the insensitivity to external magnetic fields and ultra-fast dynamics make antiferromagnets promising candidates for active elements in spintronic devices, optical control has been limited to a few insulating antiferromagnets with specific spin configurations at cryogenic temperatures. Here, we demonstrate optical manipulation of the staggered magnetiza...

Our recent numerical results on many-body localization in disordered and quasiperiodic spin chains will be presented. The time dynamics in 1D disordered Heisenberg spin-1/2 chain is studied focusing on a regime of large system sizes and a long time evolution. Performing extensive numerical simulations of the imbalance, a quantity often employed in the experimental studies of MBL, we show that the regime of a slow power-law decay of imbalance persists to disorder strengths exceeding by at leas...

The competition between unitary evolution that spreads information throughout the manybody system, and the monitoring action of an environment gives rise to dynamical phases separated by measurement-induced phase transitions. The first part of the talk will be devoted to numerical investigations of the structure of many-body wave functions of 1D random quantum circuits with local measurements across a measurement-induced transition between phases with volume-law and area-law scaling of entang...

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To date, excitons have mainly been studied in rigid band semiconductors. Due to the irrelevance of electron-electron correlations in these systems, the same hydrogenic excitonic models apply to many material classes. In Mott insulators, however, strong interactions between electronic, spin, and orbital degrees of freedom create pathways for other excitonic binding mechanisms. These so-called Hubbard excitons are predicted to exhibit novel non-hydrogenic properties that rely critically on the ...

We consider thermoelectric transport in correlated metals with disorder within a simple phenomenological approach. We allow for a particle-hole asymmetry in the inelastic scattering rate. We find that the effects of this asymmetry disappear at low temperatures in Fermi liquids (where electronic contribution to resistivity r~ T2) but not in non-Fermi liquids (r~ Tn: n*1), which can lead to changes of sign of the Seebeck coefficient at low temperatures with respect to that found in a band theo...

Quantum systems evolving unitarily and subject to quantum measurements exhibit various types of non-equilibrium phase transitions, arising from the competition between unitary evolution and measurements. Dissipative phase transitions in steady states of time-independent Liouvillians and measurement induced phase transitions at the level of quantum trajectories are two primary examples of such transitions. Investigating a many-body spin system subject to periodic resetting measurements, we arg...

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