17.11.2020: Fermi surface of nickel

Experimental determination of fermi surfaces as introduced in PEP5/MKEP2.1: de Haas van Alphen and Photoemission experiments.

Aim: (1) Reminding yourself to the experimental methods. (2) Reminder on Fermi surfaces of metals.

• Manuscript I to be discussed: De Haas van Alphen Effect in Nickel: Joseph et al, 1963
• Manuscript II to be discussed: Photoemission spectroscopy in Nickel: Magnussen1999
• Supporting link: Visualizing Fermi surfaces I: http://www.phys.ufl.edu/fermisurface/
• Recommended literature: E.g., Ascroft, Mermin: Solid State Physics (ch. 14 in the Int. Ed. 1972)
• Textbook Patterson (Springer)
• Video from Diamond Light Source about their ARPES facility
• All the backup slides for the tutorial
• Advanced reading: Fermi surface of Cu from quasi-particle interference (STM): Petersen et al 1995
• Advanced reading: Friedel oscillations: Surface states of Cu, Crommie Science 1993

1.12.2020: Peierls instability

Aim: Discussing experimental evidence of Peierls instabiliy and CDW formation.

• Manuscript to be discussed: Wang et al., ACS nano 2020 (in particular experimental data in Figs. 1, 2, 5)
• Textbooks: Patterson, Solid State Physics; Khomskii, Basic aspects of the quantum theory of solids; and many more!
• Link for further reading: Gruener, Review Mod Phys (download repaired)
• Link for further reading: Review paper on Peierls Instability and Charge Density Waves: Pouget 2016
• Non-expert reading: Physics Today 1996
• On the experiment: Nobel prize 1986: Scanning Tunneling Microscope (for ST-Microscopy and ST-Spectroscopy)
• Textbook on Molecular Beam Epitaxy, online access via HEIDI

15.12.2020: Mott-Hubbard gap in NiO 

12.1.2021: Spin-charge separation

26.1.2021: Kondo effect in quantum dots

9.2.2021: Geometrical frustration in a triangular antiferromagnet

Questions to be addressed in each tutorial session:

1. Which experiment has been done? What is the experimental set-up, how does it work?
2. What can be learnt from this experiment in general? How do the results look like in general, let's say on the textbook-level?
3. What are the results in this particular case?
4. How to analyze/interpret the results? 
5. What can be extracted for the general understanding of this material?
6. Any other related question which you may find interesting.