Graduate Program in Physics at UFSC, Florianópolis

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Exploring quantum quasi-crystal patterns: A variational approach

Prof. Dr. Alejandro Mendoza Coto

UFSC/FSC

Abstract:

In the present seminar I will discuss the emergence of quasicrystal configurations in the ground-state phase diagram of bosonic systems interacting through pair potentials of Lifshitz’s type. By using a variational mean-field approach, we determine the relevant features of the corresponding potential interaction kind stabilizing such quasicrystalline states in two dimensions. Unlike their classical counterpart, in which the interplay between only two wave vectors determines the resulting symmetries of the solutions, the quantum picture relates in a more complex way to the instabilities of the homogeneous phase. Moreover, the quantum quasicrystal patterns are found to emerge as the ground state with no need of moderate thermal fluctuations. The study extends to the exploration of the excitation properties and the possible existence of superquasicrystals, i.e., supersolidlike quasicrystalline states in which the long-range nonperiodic density profile coexists with a nonzero superfluid fraction. Our calculations suggest that, in an intermediate region between the homogeneous superfluid and the normal quasicrystal phases, these exotic states indeed exist at zero temperature. Comparison with full numerical simulations provides a solid verification of the variational approach adopted in this paper.

Date: June 3, 2022 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/st0dUS-X4FQ

The Physics Graduate Program invites everyone to:

Defense of Doctoral Thesis

Clésio Evangelista Mota

ASTROFÍSICA NUCLEAR REVISITADA A PARTIR DA TEORIA DA GRAVIDADE MODIFICADA

Defense Committee:

Profª. Drª. Débora Peres Menezes – (president) – (UFSC/FSC)

Prof. Dr. Dimiter Hadjimichef – (external member) – UFRGS

Prof. Dr. Luis Cesar Nunes dos Santos – (external member) – UFPB

Prof. Dr. Tiago José Nunes da Silva – (local member) – UFSC/FSC

Prof. Dr. Celso de Camargo Barros Junior – (supplementary member)- UFSC/FSC

Prof. Dr. César Oswaldo Vásquez Flores – (supplementary member) – UEMASUL

Date: May 30, 2022 – monday – Times: 2:30 pm – Place: sala virtual da Conferência Web da Rede Nacional de Ensino e Pesquisa (RNP)

Virtual room access link: https://conferenciaweb.rnp.br/webconf/debora-peres

The Graduate Program in Physics at UFSC makes public the notices of the selection process for the master’s and doctoral courses for admission in the second semester of 2022.

Enrollment will take place from May 18 to June 27, 2022, until 5 pm. The PPGFSC uses the score of the Unified Examination of Graduate Studies in Physics – EUF for admission to the master’s doctorate courses.

Click here to access the PPGFSC/UFSC selection process page.