Speaker
Description
The structure of entanglement in quantum many-body systems is ubiquitously characterized via the modular or entanglement Hamiltonian (EH). For a ground state within 1+1D conformal field theory, the EH is known to be given by a deformation of the physical Hamiltonian. This deformation is linear close to the subsystem boundaries, which is a manifestation of the seminal Bisognano-Wichmann result. In my talk I will consider the ground state of a free Dirac fermion, which is subject to partial projective measurements of the density. In the particular case of a subsystem surrounded by two measurement regions, I show that the deformation vanishes as a square root around the boundaries. Furthermore, the EH also acquires a local chemical potential term, which is due to the charge density induced by the measurement.