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Seminars and Thesis Defences
Cavity OptomechanicsAssoc. Prof. Eyal Buks
Nano-Electronics Research Center, Technion, Israel
In Nanotalo at 09:45, on Friday, May 24, 2013
The ﬁeld of cavity optomechanics deals with a family of systems, each is composed of two coupled elements. The ﬁrst one is a mechanical resonator, commonly having low damping rate, and the second one is an ancilla system, which is typically externally driven. Commonly, the mutual coupling between the subsystems (mechanical resonator and the ancilla system)makes the dynamics of the ancilla system dependent on the displacement of the mechanical resonator. Such coupling can be exploited for displacement detection of the mechanical resonator, which can be performed by monitoring the response of the driven ancilla system. On the other hand, the same coupling unavoidably gives rise to back-reaction eﬀects acting back on the mechanical resonator and effectively modifying its properties and its dynamics.
The talk will be devoted to three experiments. In the first one, the ancilla system is an optical cavity formed using an optical fiber; in the second one the ancilla system is a microstrip superconducting microwave cavity; whereas in the third experiment a direct current (DC) superconducting quantum interference device (SQUID) plays the role of the ancilla system. A variety of back-reaction effects are observed in these experiments including linear and nonlinear spring effect, dynamical meta-stability and self-excited oscillations.
Doctoral Thesis Defence
Nanostructured Materials under Ion and Microwave Radiation Khattiya Chalapat
O.V. Lounasmaa Laboratory, Aalto University, Finland
In Lecture Hall J (U149), Otakaari 1 at 12:00, on Friday, May 24, 2013
Spintronics with insulatorsProf. Yaroslav Tserkovnyak
UCLA , USA
In Nanotalo 228 at 13:15, on Tuesday, August 13, 2013
While insulators block electrical charge currents, they may provide a fertile ground for transmitting and manipulating spin currents. In ferromagnetic insulators, in particular, magnons can readily carry spin currents at the interfaces with metals as well as through magnetic bulk. Their bosonic nature, furthermore, makes them intriguing for spintronics in view of their possible condensation and superfluidity. I will discuss our recent work on these topics, taking the Landau-Lifshitz phenomenology as the departure point for constructing quantum kinetic theory of magnon transport and collective magnetic dynamics, driven by thermal bias.
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