Seminars by the Department of Physics - UniTS , 15 July, 14:30 A. Wojciechowska & 15:30 I. Amelio
CMSP Seminars Secretariat
OnlineCMSP at ictp.it
Fri Jul 11 15:00:20 CEST 2025
Dear colleagues,
You are cordially invited to attend two seminars organized by the
*Department of Physics of the University of Trieste* that will take
place on *Tuesday 15 July *at *ICTP *(Lagrange Lecture Hall), and via Teams.
You are all most welcome to attend!
Please find all information below.
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*"Ultralong-range Rydberg molecules of Hg atoms"*
Agata Wojciechowska
/Faculty of Physics, University of Warsaw (Poland)/
*Tuesday 15/7/2025* *14:00*
ICTP-Lagrange Lecture Hall
Live streaming: Teams link
<https://teams.microsoft.com/l/meetup-join/19%3a20fcd3dcebb2472b92185794ebe76f53%40thread.tacv2/1752050798325?context=%7b%22Tid%22%3a%22a54b3635-128c-460f-b967-6ded8df82e75%22%2c%22Oid%22%3a%228106893d-886b-4f3e-bee1-d8d57406c34b%22%7d>
Ultralong-range Rydberg molecules, composed of an excited Rydberg atom
and a ground-state atom, are characterized by large bond lengths, dipole
moments, sensitivity to external fields, and an unusual binding
mechanism based on low-energy elastic electron scattering. Although
Rydberg molecules formed between alkali atoms have received the most
attention, the additional complexity found in atoms with more than a
single valence electron poses new theoretical challenges as well as new
possibilities for control and design of the molecular structure. In this
work, we extend the theory of Rydberg molecules to include the
additional spin coupling of the Rydberg states of a multivalent atom. We
employ this theory to describe the properties of Rydberg molecules
composed of mercury atoms. We calculate the potential energy curves of
both heteronuclear (Hg*Rb) and homonuclear (Hg*Hg) molecules. In the
former case, we propose the realization of long-range spin entanglement
and remote spin flip. In the latter, we show how long-lived metastable
molecular states of Hg*Hg exist as resonances above the dissociation
threshold.
Contact: Luis Ardila (UniTS)
Email: luis.ardila at units.it
------------------------------------------------------------------------
*"Polarons in interacting many-body systems"*
Ivan Amelio
/Université Libre de Bruxelles/
*Tuesday 15/7/2025* *15:30*
ICTP-Lagrange Lecture Hall
Live streaming: Teams link
<https://teams.microsoft.com/l/meetup-join/19%3a20fcd3dcebb2472b92185794ebe76f53%40thread.tacv2/1752050884274?context=%7b%22Tid%22%3a%22a54b3635-128c-460f-b967-6ded8df82e75%22%2c%22Oid%22%3a%228106893d-886b-4f3e-bee1-d8d57406c34b%22%7d>
When an impurity is immersed in a many-body background, it is dressed by
the excitations of the bath, and forms «a polaron». This physics is
relevant for electrons dressed by phonons, excitons in 2D materials, and
cold atomic mixtures. In particular, the injection spectrum of the
impurity carries the hallmarks of the properties and correlations
present in the bath: as an outstanding application, the excitons
optically injected in a few layer heterostructure can be used as a probe
of the electronic state. In this talk, we will first review the basic
theoretical framework and recent experimental progress. Then, we will
theoretically analyze a few cases of polaron formation in interacting
many-body baths, featuring BCS pairing [1,2], charge density waves
[3,4], Mott insulator phases [4], topological edge states [5], BKT
transitions [6], etc. We will demonstrate that the correlations and
peculiarities of the bath bear strong implications for the polaron
formation and injection spectrum. [1] IA et al., PRB 107, 155303 (2023)
[2] IA, PRB 107, 104519 (2024) [3] IA et N Goldman, SciPost Physics 16,
056 (2024) [4] IA, G Mazza, N Goldman, PRB 110, 235302 (2024) [5] A
Vashisht, IA et al., Nat. Comm., 16, 4918 (2025) [6] P Comaron, N
Goldman, A Imamoglu, IA arXiv:2412.08546
Contact: Luis Ardila (UniTS)
Email: luis.ardila at units.it
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