Killing the Fermi surface: Some ideas on the strange metal, Fermi arcs and other phenomena

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 phenomena
3
A point of view
4
This talk
5
(No Transcript)
6
(No Transcript)
7
Fermi surface of underlying normal ground
state??

8
Simple observations
9
(No Transcript)
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)

30
(No Transcript)
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)
33
(No Transcript)