Contents

Hi, welcome to the world of continuous-time quantum impurity solvers.

This is the official user manual for the iQIST software package which implements several state-of-the-art continuous-time quantum impurity solvers. In this chapter, you will learn something you have to know about the continuous-time quantum impurity solvers, and of course the iQIST software package.

Are you ready? Let's go!

• What's iQIST? // Is it a food or an animal?
• Motivation // Why do we need the iQIST software package?
• Components // What does the iQIST software package include?
• Software architecture // A bird's eye view of the iQIST software package.
• Features // What can we do by using the iQIST software package?
• Policy // Some basic rules and tips.

If you are already familiar with the iQIST software package, perhaps you will be interested in the following advanced topics:

• Quantum impurity solvers // A comprehensive reference about the impurity solvers.
• [Atomic eigenvalue problem solver] // A comprehensive reference about the atomic eigenvalue solver.
• [Auxiliary tools] // Full descriptions about the auxiliary toolbox.
• [iQIST in action] // Successful stories about the iQIST software package.

If you want to learn the secrets of the iQIST software package, then diving into

• [Inside iQIST] // The principles, tricks, formulations, algorithms that are implemented in iQIST.

may be the best choices.