Summer2018

Single-shot condensation of exciton polaritons and the hole burning effect

  • By Leena Aggarwal
  • 10 September 2018

The single-shot measurements offer a unique opportunity to study fundamental properties of non-equilibrium condensation in the presence of a reservoir. David Snoke and his colleagues have recently reported an insight into spontaneous condensation by imaging long-lifetime exciton polaritons in a high-quality inorganic microcavity in a single-shot optical excitation regime, without averaging over multiple condensate realisations. The results are published in the Journal of Nature Communications. They have demonstrated that how condensation is strongly influenced by an incoherent reservoir and that the reservoir depletion, the so-called spatial hole burning, is critical for the transition to the ground state.

Correlated Nanoelectronics

Speaker(s): 
Dr. Jeremy Levy
Dates: 
Friday, September 21, 2018 - 11:30am

The study of strongly correlated electronic systems and the development of quantum transport in nanoelectronic devices have followed distinct, mostly non-overlapping paths.  Electronic correlations of complex materials lead to emergent properties such as superconductivity, magnetism, and Mott insulator phases. Nanoelectronics generally starts with far simpler materials (e.g., carbon-based or semiconductors) and derives functionality from doping and spatial confinement to two or fewer spatial dimensions.  In the last decade,...

Ultrafast Optical Probing of Correlated Polar Metals

Speaker(s): 
Dr. Venkatraman Gopalan
Dates: 
Friday, October 12, 2018 - 11:30am

There is considerable interest today in quantum materials. While all materials obey quantum mechanics, there is specific interest in phenomena that go beyond the independent single electron approximation, and arise in strongly correlated electron systems, strong spin-orbit coupled systems, and topologically protected systems. In this talk, I will present an interesting state of matter called polar metals in a correlated electron system, Ca3Ru2O7. The talk will present the origin of the counterintuitive polar displacements in a bulk metal, and show that it has domains and...

Coupling Spin Qubits to Dynamic Nanoscale Magnetic Textures for Enhanced Quantum Sensing and Control

Speaker(s): 
Dr. Jesse Berezovsky
Dates: 
Friday, October 5, 2018 - 11:30am

As we begin to look at how spin qubits might be integrated into a scalable platform, a fruitful strategy is to engineer the magnetic environment of the spins using micron- or nanometer-scale ferromagnetic (FM) elements, for functionalities such as nanoscale addressability, spin-wave mediated coupling, or enhanced sensing. The promise of these FM/spin interactions brings with it the question of how the coherence properties of the spin will be affected by coupling to these complex mesoscopic systems. To explore the physics of individual spins coupled to a proximal, dynamic...

Ultrafast Microscopy of Spin-Momentum Locked Surface Plasmon Polaritons

  • By Leena Aggarwal
  • 27 June 2018

The recently published paper in journal of ACS NANO on Ultrafast Microscopy of Spin-Momentum Locked Surface Plasmon Polaritons is an essential research for designing optical elements to control spin-polarized SPP (surface plasmon polaritons) fields on the nano femto scale. Hrvoje Petek and his colleagues have shown two-photon photoemission electron microscopy images formed by coupling and propagation of longitudinal and transverse components of SPP fields of light. Further, they have also shown the spin-momentum locked SPP wave packets launched with circularly polarized excitation propagate at the same phase and group velocities as for the linearly polarized excitation using time-resolved experiments.