03/17/2023
By Vishnuteja Chavva

The Kennedy College of Science, Department of Physics, invites you to attend a master's thesis defense by Vishnu Chavva entitled “Restoring Adiabaticity Around an Exceptional Point.”

MS Candidate: Vishnu Chavva
Date: Friday, March 31, 2023
Time: 4 to 6 pm
Location: Olney, Rm. 115, North Campus

Zoom link will be available to those interested, please contact Vishnuteja_Chavva@student.uml.edu at least 24 hours prior to the defense to request access.

Title: Restoring Adiabaticity Around an Exceptional Point

Dissertation Committee Members:

  • Advisor Hugo Ribeiro, Assistant Professor, Physics & Applied Physics, University of Massachusetts Lowell
  • Archana Kamal, Associate Professor, Physics & Applied Physics, University of Massachusetts Lowell
  • Nishant Agarwal, Assistant Professor, Physics & Applied Physics, University of Massachusetts Lowell

Abstract: A particular feature of non-Hermitian systems is the existence of special points in parameter space for which the eigenvalues and eigenvectors for the system coalesce. These points are known as exceptional points (EPs), and can lead to properties such as complex eigenvalues and gain/loss dynamics. When the time-dependent parameters of the system’s dynamical matrix are slowly varied around a closed loop encircling an EP in parameter space, a non-reciprocal exchange of energy between the eigenstates occurs, corresponding to a breaking of the adiabatic theorem. This work investigates two protocols based on shortcuts-to-adiabaticity (STA) that aim to correct the non-adiabatic evolution, and compare their effectiveness, usability and limitations.