Quantum Critical Response at the Onset of Spin Density Wave Order in Two-dimensional Metals
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| dc.contributor.author |
Hartnoll, Sean |
|
| dc.contributor.author |
Metlitski, Max |
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| dc.contributor.author |
Hofman, Diego
|
|
| dc.contributor.author |
Sachdev, Subir
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| dc.date.accessioned |
2012-01-30T16:05:21Z |
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| dc.date.issued |
2011 |
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| dc.identifier.citation |
Hartnoll, Sean, Diego M. Hofman, Max A. Metlitski, and Subir Sachdev. 2011. Quantum critical response at the onset of spin density wave order in two-dimensional metals. Physical Review B 84(12): 125115. |
en_US |
| dc.identifier.issn |
1550-235X |
en_US |
| dc.identifier.uri |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:8063398 |
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| dc.description.abstract |
We study the frequency dependence of the electron self-energy and the optical conductivity in a recently developed field theory of the spin-density-wave quantum phase transition in two-dimensional metals. We focus on the interplay between the Fermi surface “hot spots” and the remainder of the “cold” Fermi surface. Scattering of electrons off the fluctuations of the spin-density-wave order parameter, \(\varphi\), is strongest at the hot spots; we compute the conductivity due to this scattering in a rainbow approximation. We point out the importance of composite operators, built of products of the primary electron or \(\varphi\) fields: These have important effects also away from the hot spots. The simplest composite operator, \(\varphi^2\), leads to deviations from Landau Fermi-liquid behavior on the entire Fermi surface. We also find an intermediate frequency window in which the cold electrons lose their quasiparticle form due to effectively one-dimensional scattering processes. The latter processes are part of umklapp scattering, which leads to singular contributions to the optical conductivity at the lowest frequencies at zero temperature. |
en_US |
| dc.description.sponsorship |
Physics |
en_US |
| dc.language.iso |
en_US |
en_US |
| dc.publisher |
American Physical Society |
en_US |
| dc.relation.isversionof |
doi://10.1103/PhysRevB.84.125115 |
en_US |
| dc.relation.hasversion |
http://arxiv.org/abs/1106.0001 |
en_US |
| dash.license |
OAP |
|
| dc.subject |
strongly correlated electrons |
en_US |
| dc.subject |
high energy physics |
en_US |
| dc.title |
Quantum Critical Response at the Onset of Spin Density Wave Order in Two-dimensional Metals |
en_US |
| dc.type |
Journal Article |
en_US |
| dc.description.version |
Author's Original |
en_US |
| dc.relation.journal |
Physical Review B |
en_US |
| dash.depositing.author |
Sachdev, Subir
|
|
| dc.date.available |
2012-01-30T16:05:21Z |
|
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FAS Scholarly Articles [5171]
Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
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