Dynamical conductivity and its fluctuations along the crossover to many-body localization

Friday September 16th, 2016 Hrvoje Buljan 0

ABSTRACT: We present a numerical study of the many-body localization (MBL) phenomenon in the high-temperature limit within an anisotropic Heisenberg model with random local fields. Taking the dynamical spin conductivity σ(ω) as the test quantity, we investigate the full frequency dependence of sample-to-sample fluctuations and their scaling properties as a function […]

Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene

Friday September 16th, 2016 Hrvoje Buljan 0

ABSTRACT: Graphene plasmons have been found to be an exciting plasmonic platform, thanks to their high field confinement and low phase velocity, motivating contemporary research to revisit established concepts in light–matter interaction. In a conceptual breakthrough over 80 years old, Čerenkov showed how charged particles emit shockwaves of light when moving […]

Polaronic metal state at the LaAlO3/SrTiO3 interface

Tuesday February 16th, 2016 Hrvoje Buljan 0

ABSTRACT: Interplay of spin, charge, orbital and lattice degrees of freedom in oxide heterostructures results in a plethora of fascinating properties, which can be exploited in new generations of electronic devices with enhanced functionalities. The paradigm example is the interface between the two band insulators LaAlO3 and SrTiO3 that hosts a […]

Exploiting Optical Asymmetry for Controlled Guiding of Particles with Light

Sunday January 17th, 2016 Hrvoje Buljan 0

ABSTRACT: Conventional methods of manipulating particles with light, such as optical tweezers and optical tractor beams, rely on beamshaping to realize complex electromagnetic field profiles and are thus sensitive to scattering. Here, we show that, by introducing tailored optical asymmetry in the particle, we can realize a novel guiding method that is controllable by […]