1. Killing the Fermi surface: Some ideas on the strange metal, Fermi arcs and other phenomena
T. Senthil (MIT)
TS, ``Critical fermi surfaces and non-fermi liquid metals”, Phys Rev B, June 08

2. Some puzzles in the cuprates: finite-T phenomenax
dSc
Pseudo
gap
AF Mott
insulator
Strange
metal
Fermi liquid

3. A point of view

4. This talk

7. Fermi surface of ``underlying normal” ground state??

8. Simple observations

10. Other phase transitions where entire Fermi surfaces might disappear

11. How might a Fermi surface disappear?

12. Electronic structure at criticality: ``Critical Fermi surface”

13. Why a critical Fermi surface?

14. Evolution of single particle gap

15. Why a critical Fermi surface? Evolution of momentum distribution

16. Killing a Fermi surface

17. Some obvious consequences/questions

18. Scaling phenomenology at a quantum critical point with a
critical Fermi surface?

19. Critical Fermi surface: scaling for single particle physics

20. New possibility: angle dependent exponents

21. Leaving the critical point

22. Approach from the Fermi liquid

23. Critical 2Kf surface

24. Implications of angle dependent exponents

25. Finite T crossovers

26. Application to proposed hiTc critical point

27. Crossovers near proposed hiTc critical point

28. Transport scaling

29. Summary
Strange metal in cuprates: associate with quantum critical point where the entire large Fermi surface disappears.
Concept of critical fermi surface to describe such a quantum critical point - unusual scaling phenomenology.
Scaling hypotheses for various quantities
Possibility of angle dependent exponents with interesting consequences (eg: metals with T-dependent Fermi arcs at intermediate temperature)

31. Possible evolutions of Fermi surface with doping at T = 0

32. dHvA in CeRhIn5CeRhIn5
H. Shishido, R. Settai, H. Harima, & Y. Onuki, JPSJ 74, 1103 (2005)