WitrynaTherefore, in the discussions below, the word “impurity” may be understood as representing either impurity or point defect, unless specifically stated otherwise. In the literature, impurities are typically classified into two categories: “shallow” and “deep”. WitrynaWithin the framework of exact diagonalization (ED), we compute the ground state of Anderson impurity problem using the variational approach based on the configuration interaction (CI) expansion. We demonstrate that an accurate ground state can be obtained by iteratively diagonalizing a matrix with the dimension that is less than 10% …

Complexity of quantum impurity problems - arXiv

Witryna14 paź 2024 · Quantum impurity theory studies the effects of introducing atoms of one element (ie, 'impurities') into an ultracold atomic gas of another element. For example, a small number of potassium... Witryna18 lut 2024 · This well-known task impurity problem (that is related to all executive functions) indicates that, since any target inhibitory control process must be embedded in a specific context, systematic variance is attributable to non-inhibitory control abilities ( Miyake et al., 2000 ). canadian citizenship name change application

The Relations Among Inhibition and Interference Control …

Witryna7 cze 2024 · Non-Hermitian non-reciprocal systems are known to be extremely sensitive to boundary conditions, exhibiting diverse localizing behaviors and spectrum structures when translational invariance is locally broken, either by tuning the boundary coupling strength, or by introducing an effective boundary using impurities or defects. In this … WitrynaQuantum impurity problems are also interesting from the standpoint of Hamiltonian complexity theory [10]. In general, estimating the ground energy of a quantum many-body system composed of spins or fermi modes with local interactions is a hard problem. Formally, this problem is complete for the complexity class QMA { a quantum … WitrynaAn issue in experimental design is the task impurity problem. This is when a task may rely on a complex mixture of cognitive processes, making interpretation of results … canadian citizenship mailing address