PhD Thesis Defense - COLLECTIVE ELECTRONIC AND MAGNETIC STATES IN TWO-DIMENSIONAL TRANSITION METAL DICHALCOGENIDES
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PhD Thesis Defense - COLLECTIVE ELECTRONIC AND MAGNETIC STATES IN TWO-DIMENSIONAL TRANSITION METAL DICHALCOGENIDES
CFM Seminars
- Speaker
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Paul Dreher, Centro de Fisica de Materiales
- When
-
2022/03/25
12:00
- Place
- Auditorium, Centro de Fisica de Materiales
- Add to calendar
-
iCal
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Single-layer (SL) transition metal dichalcogenide (TMD) materials possess a
variety of collective electronic phases such as superconductivity (SC), charge
density wave (CDW) order, and magnetic correlations, which exhibit fascinating
properties in the confined space of two dimensions. In these layered materials
electron-electron interactions are enhanced, which can trigger novel physical
phenomena. In particular, the most fundamental properties and intrinsic
parameters such as the critical temperatures (Tc) of these phases are strongly
modified in most cases when reducing the dimension. Furthermore, the interplay
of the electronic phases becomes crucial. Important questions on the pairing
symmetry in 2D-TMD superconductors and the stability of these phases to
external perturbations such as magnetic fields and doping atoms remain
elusive.
This thesis presents an atomic-scale study of the collective electronic states
present in selected novel TMD materials in the ultimate single-layer limit.
Molecular beam epitaxy is deployed to grow highly crystalline single-layer
materials and more complex TMD heterostructures. By means of low temperature
scanning tunneling microscopy and spectroscopy (STM/STS) under ultra-high
vacuum conditions and high magnetic fields, we are able to study the
electronic structure in depth and, therefore, the phase diagrams of these 2D
materials. This thesis also benefits from other experimental techniques (AFM,
ARPES, XMCD, XPS, SQUID, RHEED, LEED) and calculations that provide
complementary information to better understand the phenomenology of the
physical systems under study.
Supervisor: Miguel Moreno Ugeda