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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