Bergman, Doron L. and Refael, Gil (2013) Thermodynamic measure of the magnetoelectric coupling in a three-dimensional topological insulator. Physical Review B, 87 (2). Art. No. 024202. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:20120130-132632571
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We show that the magnetoelectric coupling in three-dimensional (strong) topological insulators is related to a second derivative of the bulk magnetization. The formula we derive is the nonlinear-response analog of the Streda formula for Hall conductivity [Streda, J. Phys. C 15, L717 (1982)], which relates the Hall conductivity to the derivative of the magnetization with respect to the chemical potential. Our finding allows one to extract the magnetoelectric coefficient by measuring the magnetization, while varying the chemical potential and one more perturbing field. The relation we find also makes transparent the effect of disorder on the magnetoelectric response, which occurs only through the density of states, and has no effect when the system is gapped.
|Alternate Title:||A thermodynamic measure of the Magneto-electric coupling in the 3D topological insulator|
|Additional Information:||© 2013 American Physical Society. Received 20 July 2012; published 8 January 2013. D.L.B. was generously supported by the Sherman Fairchild Foundation. G.R. acknowledges support from DARPA and from the Caltech Institute of Quantum Information and Matter, an NSF Physics Frontiers Center with the support of the Gordon and Betty Moore Foundation.|
|Group:||IQIM, Institute for Quantum Information and Matter|
|Classification Code:||PACS number(s): 72.10.−d, 71.20.−b, 72.20.−i|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||21 Mar 2012 21:05|
|Last Modified:||09 Jan 2016 00:48|
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