Theory of collective magnetophonon resonance and melting of a field-induced Wigner solid
Artikel i vetenskaplig tidskrift, 2019

Electron solid phases of matter are revealed by characteristic vibrational resonances. Sufficiently large magnetic fields can overcome the effects of disorder, leading to a weakly pinned collective mode called the magnetophonon. Consequently, in this regime it is possible to develop a tightly constrained hydrodynamic theory of pinned magnetophonons. The behavior of the magnetophonon resonance across thermal and quantum melting transitions has been experimentally characterized in two-dimensional electron systems. Applying our theory to these transitions we explain several key features of the data. Firstly, violation of the Fukuyama-Lee sum rule as the transition is approached is shown to be a consequence of the non-Lorentzian form taken by the resonance. Secondly, this non-Lorentzian shape is shown to be caused by dissipative channels that become especially important close to melting: proliferating dislocations and uncondensed charge carriers.

Författare

Delacretaz

Stanford Univ, Dept Phys

Blaise Gouteraux

Université Paris-Saclay

Kungliga Tekniska Högskolan (KTH)

Stockholms universitet

Sean A. Hartno

SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd

Stanford Univ, Dept Phys

Anna Karlsson

Institute for Advanced Studies

Chalmers, Fysik, Teoretisk fysik

PHYSICAL REVIEW B

2469-9950 (ISSN) 2469-9969 (eISSN)

Vol. 100 8 085140

Ämneskategorier

Atom- och molekylfysik och optik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.100.085140

Mer information

Senast uppdaterat

2019-10-24