ELFT HÍRADÓ

[Kormányos Andor <andor.kormanyos AT ttk.elte.hu>]

  ELTE TTK Fizikai Intézet / ELTE Institute of Physics


ORTVAY KOLLOKVIUM / ORTVAY COLLOQUIUM
(https://physics.elte.hu/ortvayseminar)



Thursday, 19th September  2024, 15:00h.

Pócza Jenő Classroom,  Physics Building 1.71.

Pázmány Péter sétány 1/A, 1117 Budapest



Justin Ye

University of Groningen

Field Effect Control of Quantum Phases in 2D Materials

In recent years, there have been many breakthroughs in the electronic states 
of 2D materials, particularly in artificial multilayer systems, where 
unconventional phenomena such as superconductivity and ferromagnetism have 
been discovered in bi- and tri-layer systems. This talk will focus on quantum 
phase transitions and Ising superconductivity in 2D transition metal 
dichalcogenides. Using ionic gating techniques, quantum phases like 
superconductivity can be induced and controlled in various 2D materials, 
while preserving global symmetry despite the breakdown of local inversion 
symmetry. The field-effect control of Josephson and spin-orbit coupling 
mechanisms provides a suitable platform to explore exotic electronic states 
predicted for coupled bilayer superconducting systems with strong spin-orbit 
interaction. In transition metal dichalcogenides, Ising-like pairing states 
exhibit robust orthogonal spin protection and remarkably high upper critical 
fields.

This talk will address: (1) strategies to enhance carrier mobility to access 
the clean regime of Ising superconductivity; (2) methods to couple two Ising 
superconducting states via Josephson coupling to form FFLO states; and (3) 
approaches to control Ising pairing strength and access electronic states 
with broken local inversion symmetry while maintaining global inversion 
symmetry, all facilitated by ionic gating and field-effect control of 
Josephson and spin-orbit coupling.


Andor Kormányos
coordinator