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math-ph2021
Dressed energy of the XXZ chain in the complex plane
Saskia Faulmann, Frank Göhmann, Karol K. Kozlowski
We consider the dressed energy of the XXZ chain in the massless antiferromagnetic parameter regime at and at finite magnetic field. This function is define…
cond-mat.stat-mech2021
Fourth-neighbour two-point functions of the XXZ chain and the Fermionic basis approach
Frank Göhmann, Raphael Kleinemühl, Alexander Weiße
We give a descriptive review of the Fermionic basis approach to the theory of correlation functions of the XXZ quantum spin chain. The emphasis is on explicit formulae for short-ra…
cond-mat.str-el2021
Introduction to Solid State Physics
Frank Göhmann
Lecture Goals: (i) Introduction to the basic concepts, meaning that the emphasis is, in the first instance, on the single-particle aspects. (ii) Service for Experimental Solid Stat…