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UID:69d4adc012ebb
DTSTART:20240902T090000Z
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TRANSP:OPAQUE
LOCATION:ICFO Auditorium and Online (Teams)
SUMMARY:ICFO | RAFAEL LUQUE MERINO
CLASS:PUBLIC
DESCRIPTION:The study of strongly-correlated matter in two-dimensional mate
 rials has emerged as a exciting prospect for the exploration of condensed 
 matter physics\, as well as the design of novel device platforms. Moir&eac
 ute\; engineering\, where the 2D layers feature an interlayer twist angle 
 of 1.1&ordm\; between the graphene layers generates a moir&eacute\; superl
 attice potential. A flat electronic band appears at the Fermi level\, in w
 hich a variety of interaction-driven\, many-body quantum phases can emerge
 . Another avenue to study strong electronic correlations in two dimensions
  is the exfoliation of intrinsically correlated bulk crystals into the ato
 mic limit.\nThe optoelectronics study of strongly-correlated systems in 2D
  heterostructures stands out as a powerful probe\, as it can provide insig
 ht into both the electronic transport properties and the fundamental light
 -matter interaction in these systems. In this thesis\, we study two strong
 ly correlated 2D materials: MATBG and the cuprate superconductor Bi2Sr2CaC
 u208-delta (BSCCO-2212). We leverage different optoelectronic techniques t
 o study the fundamental properties of the correlated electrons in the MATB
 G flat bands and the potential of two-dimensional BSCCO-2212 layers for ap
 plications in quantum sensing.\nFirst\, we investigate the electronic spec
 trum of the MATBG flat bands through the study of their thermoelectric tra
 nsport. We use an optical excitation to induce a thermal gradient\, which 
 in turn generates a charge current. We report anomalous thermoelectricity 
 which provides strong evidence for the coexistence of localized and de-loc
 alized electronic states in the strongly-interacting flat bands.\nNext\, w
 e study the dynamics of hot carrier cooling in the MATBG flat bands using 
 a frequency-resolved photomixing technique. Strikingly\, we find that hot 
 carriers can efficiently relax their energy down to cryogenic temperatures
 \; in contrast to the case of bilayer graphene samples. We propose a novel
  Umklapp electron-photon scattering mechanism for hot carriers in MATBG\, 
 enabled by the moir&eacute\; superlattice potential.\nLastly\, we explore 
 the development of superconducting photodetectors with high-T_c based on u
 ltrathin BSCCO-2212 flakes. We fabricate high quality samples that exhibit
  remarkable performance at telecom wavelengths. We observe fast and sensit
 ive bolometric response at T = 77 K in free-space and waveguide-coupled de
 vices\, as well as single-photon sensitivity at T = 20 K through a non-bol
 ometric\, avalanche detection mechanism.\n&nbsp\;\nMonday September 02\, 1
 1:00 h. ICFO Auditorium and Online (Teams)\nThesis Director: Prof. Dr. Dmi
 tri K. Efetov
DTSTAMP:20260407T070952Z
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