QUANTUM MATERIALS AND DEVICES SEMINARS: Nonlinear response in strongly correlated systems
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QUANTUM MATERIALS AND DEVICES SEMINARS: Nonlinear response in strongly correlated systems
DIPC Seminars
- Speaker
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Robert Peters, Department of Physics, Kyoto University, Kyoto (Japan)
- When
-
2021/12/08
11:00
- Place
- Online Seminar, Donostia International Physics Center
- Add to calendar
-
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**
NOTE THE CHANGE OF STARTING TIME DUE TO THE DIFFERENCE IN TIME BETWEEN JAPAN
AND CENTRAL EUROPE
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Nonlinear responses in condensed matter are intensively studied because they
provide rich information about materials and hold the possibility of being
applied in diodes or high-frequency optical devices [1-4]. While nonlinear
responses in noninteracting models have been explored widely, the effect of
strong correlations on the nonlinear response is still poorly understood. This
talk will introduce a Green's function method to calculate nonlinear
conductivities in strongly correlated materials [5-6]. Correlation effects are
thereby included by the self-energy of the material. I will then use this
method to study the nonlinear conductivities in noncentrosymmetric f-electron
systems. The first system is a heavy Fermion system, where a nonreciprocal
conductivity appears in the ferromagnetic phase. The nonreciprocal
conductivity thereby always occurs perpendicular to the magnetization of the
system and has a strong spin dependence, which might be advantageous for
spintronic applications. The second system is a model corresponding to the
Weyl-Kondo semimetal Ce3Bi4Pd3, in which a giant spontaneous Hall effect
without time-reversal symmetry breaking has been observed [7]. This Hall
effect can be explained as a nonlinear Hall effect in an inversion-symmetry
broken Weyl-semimetal. It has been shown that the nonlinear Hall effect is
related to the Berry curvature dipole [4]. Our study shows that the magnitude
of the experimentally observed nonlinear Hall effect can be explained by the
strong correlations inherent in this f-electron material [8].
References:
1\. Y Tokura and N Nagaosa, Nature Comm. 9, 3740
2\. T Morimoto and N Nagaosa, Science Advances 2, DOI:
10.1126/sciadv.1501524
3\. Q. Ma et al., Nature 565, 337–342
4\. I Sodemann and L Fu, Rev. Lett. 115, 216806
5\. Daniel E. Parker, Rev. B 99, 045121
6\. Y Michishita and R Peters, Rev. B 103, 195133
7\. S Dzsaber et al., PNAS 118 e2013386118
8\. A Kofuji, Y Michishita, and R. Peters, Rev. B 104, 085151
9\. K Shinada and R Peters, arXiv:2110.10496
Host: Miguel A.
ZOOM: https://dipc-
org.zoom.us/meeting/register/tZAqceGqrzMqE9fPWdhzaKxoIscCspVlFJ4Y