A magnetic field for tunning Feshbach resonances in 2D Bose gases

• Grant number: 23/07276-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2023
• End date: June 30, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Atomic and Molecular Physics
• Principal Investigator: Patrícia Christina Marques Castilho
• Grantee: Gabriel Tardin Belumat
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 22/02709-6 - Quantum hydrodynamical instabilities in two-dimensional Bose gases, AP.PNGP.PI

Abstract

Quantum gases experiments configure a very flexible platform where all system's parameters can be fully controlled. The possibility of changing the nature (attractive or repulsive) and the strength of the interatomic interactions via Feshbach resonances [1] have open up the possibility to produce unitary and almost ideal atomic gases, and to study specific Hamiltonians and new states of matter, as the recent quantum droplets. Feshbach resonances are tuned by applying a uniform magnetic field to the atomic cloud. In this scientific initiation project, we will produce and stabilize the magnetic field necessary for tunning the Feshbach resonances of potassium-39 atoms by constructing a pair of coils in perfectly Helmholtz configuration, minimizing the residual in-plane confinement crucial for two-dimensional (2D) systems. The magnetic field stabilization will be done with a feedback loop control combining an ultra-stable transducer and a commercial PID (proportional, integral and derivative) circuit.