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DTSTART:20240705T120000Z
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TRANSP:OPAQUE
LOCATION:ICFO Auditorium
SUMMARY:ICFO | NICCOLÒ BALDELLI
CLASS:PUBLIC
DESCRIPTION:When matter is cooled to temperatures near absolute zero\, its 
 quantum nature begins to emerge. The interactions between its microscopic 
 constituents can then lead to the emergence of fascinating physical proper
 ties. While the framework of spontaneous symmetry breaking has been incred
 ibly successful in describing how a macroscopic number of particles cooper
 ate to give a system its properties\, there are many situations where this
  is not sufficient to describe quantum systems. This is especially true fo
 r strongly interacting many-body systems.\nIn recent years\, multiple tech
 niques have been developed to address this problem. On the one hand\, the 
 incredible advances in classical computing hardware and algorithms\, have 
 made it possible to study systems with a number of elementary components t
 hat were unimaginable just a few decades ago. In particular\, the developm
 ent of techniques such as tensor networks has unified the framework of qua
 ntum information with condensed matter physics\, making it possible to opt
 imize the computational complexity of simulating a system\, based on its e
 ntanglement content.\nOn the other hand\, the development of platforms to 
 directly perform simulations on quantum systems is a highly sought objecti
 ve. While a hypothetical universal quantum computer could dramatically inc
 rease our understanding of the quantum nature of matter\, its difficult de
 velopment makes it essential to study analog platforms where specific many
 -body models can be studied directly in a controlled environment. In these
  quantum simulators\, novel quantum phenomena can be studied in an environ
 ment free of disorder\, with excellent control over parameters and measure
 ment capabilities.\nIn this thesis\, we aim to explore these two paths to 
 study some of the most relevantactive topics in physics beyond the symmetr
 y breaking paradigm. In the first part\, devoted to topology\, we propose 
 and analyze new techniques for the detection of topological excitations. W
 e start by proposing a protocol to detect anyons\, quasiparticles that do 
 not behave either as bosons or fermions\, in Fractional Quantum\nHall Effe
 ct systems through measuring the angular momentum of impurities binding to
  the anyons. We then show how similar excitations can be identified in top
 ological superconductors through an interaction between the electromagneti
 c field of a strong laser pulse and the system in a process called High Ha
 rmonic Generation.\nIn the second part\, we move to the study of quantum f
 rustration. This phenomenon\, which describes a situation in which various
  constraints of the system cannot be satisfied simultaneously\, can lead t
 o the emergence of unexpected phases of matter. In particular\, we study h
 ow frustrated phases and a particular class of quantum critical points\, c
 alled deconfined can emerge in one-dimensional frustrated systems\, potent
 ially realizable in quantum simulators. We then study how frustration coul
 d explain the onset of superconductivity mixed with charge density modulat
 ions in two-dimensional strongly-correlated systems.\n&nbsp\;\nFriday July
  05\, 14:00 h. ICFO Auditorium \nThesis Director: Prof. Dr. Maciej Lewenst
 ein and Dr. Luca Barbiero
DTSTAMP:20260407T071959Z
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