Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
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Can interaction between emergent excitations be independent <strong>of</strong><br />
the constituent interactions?<br />
Jayantha P. Vyasanakere ∗ and Vijay B. Shenoy †<br />
Centre for Condensed Matter Theory, Department <strong>of</strong> <strong>Physics</strong>,<br />
Indian Institute <strong>of</strong> Science, Bangalore 560 012, India<br />
(Dated: November 16, 2012)<br />
Abstract<br />
Normally, in condensed matter systems, the interaction between emergent excitations will depend<br />
on the interactions among their constituents. For example, magnon-magnon interaction depends<br />
on the exchange interaction between the spins. Here we illustrate a novel system in which this is<br />
not the case.<br />
We had recently shown that a non-Abelian gauge field induces a BCS-BEC crossover in a weakly<br />
interacting fermionic system. We also showed that the BEC thus obtained is a condensate <strong>of</strong> novel<br />
kind <strong>of</strong> bosons called rashbons, which are fermion-dimers. Here we study this system by constructing<br />
a Gaussian theory <strong>of</strong> quantum fluctuations and show that the rashbon-rashbon interaction is<br />
independent <strong>of</strong> the interaction between the constituent fermions. In fact, the rashbon-rashbon interaction<br />
depends solely on the rashba spin-orbit coupling induced by the non-Abelian gauge field,<br />
which enters the kinetic energy term in the Hamiltonian.<br />
This is, to the best <strong>of</strong> authors’ knowledge, a unique and an interesting state in any condensed<br />
matter system.<br />
Research funding: CSIR, DST, DAE.<br />
References : arXiv: 1201.5332, 1108.4872, 1104.5633.<br />
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