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Non-local transport in neutral superfluids: exciton condensates and XY magnets

Speaker: 
Inti Sodemann (MIT, USA)
Date: 
Wed, 14/01/2015 - 12:00pm to 12:40pm
Location: 
Physics Conference Room (S13-M01-11)
Host: 
Shaffique Adam
Event Type: 
Seminars

Abstract

In quantum Hall bilayers at total filling fraction one the electrons can develop a many-body state in which they occupy a common coherent combination of both layers. This state behaves as a superfluid for the layer density imbalance and displays several unusual transport properties including an analogue to the Josephson effect in which dissipationless tunneling between the layers can occur. In the first part of this talk, I will describe how a simple macrospin picture is able to capture the tunneling current-voltage characteristics of this state, and in particular those in which current is simultaneously injected through both rims of a Corbino annular device. In the second, I will describe an analogue of this system realized in XY magnets, and in particular how this principle can be exploited in the development of novel spintronic devices with non-local transport characteristics.

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