Coherent Dynamics in WS2 monolayers

We use two-colour pump probe spectroscopy to investigate the dynamics of WS2 monolayers on the femtosecond timescale,  observing evidence of coherent behaviour during the overlap of the pulses for both sub- and above-bandgap pump pulses. The Optical Stark effect is found to be the cause in the case of the sub-bandgap pump, while experiments using an above-bandgap pump pulse are on-going. About ...

Dynamic conductivity in ferroelectric bubble domains

About the presenter Vivasha Govinden is a PhD student working with Prof Nagy Valanoor at UNSW to investigate ferroelectric coupling with the introduction of a spacer between ferroelectric thin films, leading to exotic ferroelectric domains that can contribute to a giant electromechanical response. An enhanced electromechanical response is key to applications in nanoelectronic sensors, memory and logic devices and electromechanical …

Engineering low-loss phonon polaritons in anisotropic 2D materials

About the presenter Qingdong Ou is a research fellow working with Prof Michael Fuhrer at Monash University to study nano-device fabrication based on 2D materials, within FLEET’s Enabling technology B. Qingdong is seeking to minimize energy losses in light-matter interactions, aiming to realise ultra-low energy consumption in 2D-semiconductor-based optoelectronics. He also studies carrier behaviour via microscale photoluminescence and photocurrent mapping, and …

Josephson effects in nanoscale devices

About the presenter Karen Bayros is a PhD student working with Jared Cole and Jackson Smith at RMIT where she models current flow through dielectric barriers in superconducting quantum bits. The influence of defects and imperfections can limit the dissipationless flow-through devices comprised of these barriers, and Karen uses advanced computational models to understand the interplay between the molecular structure …

Simulations of ultrafast coherent multidimensional spectroscopy on a Floquet system

About the presenter Jack Muir is a PhD student working with Assoc Prof Jeffrey Davis’ ultrafast spectroscopy group at Swinburne FLEET node, contributing to Research Theme 2. In his project, Jack aims to explore the ultrafast dynamics of two-dimensional transition metal dichalcogenide van der Waals heterostructures, with a particular interest in the effects of Moire potentials.

LiLateral gating of 2D electron gas on cross-sectional LAO/STO

About the presenter Fan Ji is a PhD student working with A/Prof Jan Seidel at UNSW. Her research focuses on understanding and improving the nanoscale functionality of oxide heterostructures such as LAO/STO by means of scanning-probe based nanolithography and characterisation methods. She also explores reversible control of the two-dimensional electron gas at oxide interfaces and its applicability to quantum devices. …

Progress Towards The Australian Quantum Gas Microscope

About the presenter Allan Pennings is a PhD Student working with Prof Chris Vale and Dr Sascha Hoinka, with the goal of building the Australian Quantum Gas Microscope. Contributing to FLEET’s Research Theme 3, Light-transformed Materials, his project focused on different techniques of dark field imaging with X-rays. Allan recently completed his Honours at Monash followed a Bachelor of Science (Physics) …

Magnetic Breakdown In Artificial Superlattices

About the presenter Zeb Krix is a PhD student at UNSW, where he studies the theory behind artificial graphene and artificial topological insulators, which are 2D materials with an imposed superlattice structure. Zeb models such systems in the presence of a perpendicular magnetic field in order to improve understanding of the relevant electronic transport measurements. This work is closely linked …

Transverse magnetic focusing in a two-dimensional electron gas

About the presenter Yik-Kheng Lee is a PhD student at RMIT University, working with Prof Jared Cole, following his Honours project with FLEET which was on modelling the transport properties of a two-dimensional electron gas. His research interests are in the field of topological materials, under FLEET’s research theme 1.

CryoTEM study on beam-sensitive Bi2Sr2CaCu2O8+δ van der Waals crystal and its modification by lithium

About the presenter Peng Liu is a Research Associate with CI Xiaolin Wang at the University of Wollongong. He works within FLEET’s Research theme 1 and Enabling technology theme A. He is exploring the structural and transport properties of 2D superconducting materials, with focus in electric-field gating and transmission electron microscopy.

Mechanical manipulation of ferroelectricity for low-energy technology

About the presenter Peggy Schoenherr is an experimentalist physicist with Prof Jan Seidel (UNSW), where she studies materials’ magnetic, electric and mechanical properties at the nanoscale using room-temperature and low-temperature atomic force microscopy.  The materials investigated span a wide range from superconductors to skyrmion systems to ferroic materials, with all of them potentially exhibiting the topological structures (domain walls, vortices, …

Waveform synthesis for attosecond metrology

About the presenter Matthew Weidman is a group leader working with PI Ferenc Krausz at the Max-Planck institute of Quantum Optics.

Nonreciprocal signal propagation in magnetic thin films with nonuniform exchange

About the presenter Dr Karen Livesey is a theoretical condensed matter physicist based at the University of Newcastle and is a Scientific Associate Investigator in FLEET. Her research interests are in (i) exotic behaviours in magnetic thin films, and (ii) magnetic nanoparticles for biomedical applications. It is the first research area (magnetic thin films) that overlaps with the research themes within FLEET. Her …

Non-equilibrium dynamics of a quenched Fermi gas

About the presenter Dr Ivan Herrera is a Research Fellow at Swinburne University of Technology who performs experimental research to investigate universal phenomena at the few-body and many-body level in ultracold 2D gases of fermionic atoms. Ivan works within Research Theme 3: Light-transformed materials with CI Chris Vale.

Anomalous drag in electron-hole condensates with granulated order

About the presenter Dr Hong Liu is currently working with CI Nikhil Medhekar and AI Dmitry Efimkin, exploring spin-orbit coupling and interaction effect in topological materials theoretically. As a member of Research theme 1 team, she aims to understand the criteria for protection against dissipation and also include the operational criteria for achieving dissipationless transport.

Thermal Hall effect from topological magnon-polarons

About the presenter Dr Harley Scammell is a postdoctoral researcher working with Prof Oleg Sushkov at UNSW on the theory of artificial graphene in FLEET’s Research Theme 1, topological materials. Dr Scammell’s research focusses on the interplay of various tuning parameters – such as strain and spin-orbit coupling – on the electronic properties of artificial graphene. Key considerations are additional, …

Nonlinear Quantum Electrodynamics in Dirac Materials

Classical electromagnetism is linear, however  strong fields varying slowly at the electron rest energy scale, polarize the quantum vacuum and give rise to nonlinear phenomena, such as scattering or splitting of photons and birefringence. These effects become relevant only in very strong fields that exist in exotic environments e.g. in the vicinity of heavy nuclei or neutron stars. We show …

Ultrafast optical control of topological invariants in 2D materials

About the presenter Phat Tan Nguyen is a PhD student working under the supervision of Dr Agustin Schiffrin and Dr Gary Beane at Monash University, where he is investigating optically-driven topological phases of matter using terahertz time-domain spectroscopy and pump-probe spectroscopy with sub-picosecond time resolution, and at the scale of a single atom. He is mainly involved in Research theme …

Ultrafast Exciton-Polariton Dynamics in Microcavity Structures

About the presenter Mitko Oldfield is an experimental physicist specialising in terahertz time-domain spectroscopy and exciton-polariton condensation, working with Dr Agustin Schiffrin and Dr Gary Beane at Monash University within FLEET’s research theme 2 and research theme 3. Mikto’s research focuses on forming a polariton condensate in high Q-factor microcavities through the use of a terahertz pumping beam generated via …

Epitaxial graphene on cubic silicon carbide: transport, tunability and HF

About the presenters Dr Aiswarya Pradeepkumar and PhD student David Katzmarek work with Prof Francesca Iacopi, head of Communications and Electronics, in the Faculty of Engineering and IT, UTS. Within FLEET, Francesca is an associate investigator working on graphene for low-energy electronic devices. She also liaises with the IRDS, advising potential applications and integration strategies for novel technologies generated by FLEET …

Measurement of the non-Hermitian topological invariant in perovskite-based exciton polaritons

About the presenter Eliezer Estrecho studies the behaviour of exciton-polaritons as part of FLEET’s research theme 2, exciton superfluids, working with Elena Ostrovskaya at the ANU. He is currently studying condensation of polaritons in gallium-arsenide-based microcavities using single-shot experiments and large optically induced traps. He is also working on creating polariton condensates using atomically-thin materials.

Anomalous Hall Effect in Mn3Ge films

About the presenter Wafa Afzal is a PhD student and experimental condensed-matter physicist working with Prof Xiaolin Wang at the University of Wollongong, with experience in thin-films of magnetic nanoparticle dispersions in polymers, and has studied surface and magnetic states of these films using atomic force microscopy and magnetic force microscopy. For her PhD within FLEET’s Enabling Technology Theme A …

Magnetoresistance Measurements of Polycrystalline and Amorphous Bi2Te3 Thin Films

About the presenter Alexander Nguyen is a materials engineer working with Dr Julie Karel at Monash University, where he performs magnetoelectronic transport measurements on amorphous topological insulators within FLEET’s research theme 1 and enabling technology B. An important aim is to experimentally realise topologically-protected states in an amorphous material, which may offer some benefits over crystalline materials.  Another major career …

Diisopropylamine-enabled fabrication of high-quality 2D heterostructures

About the speakerDr Shao-Yu Chen is a research fellow working with Prof Michael Fuhrer at Monash University to realising Bose-Einstein Condensation of tightly bound excitons in 2D semiconductors. He has extensive research experiences on transport and optical measurement on 2D materials including graphene and transition metal dichalcogenides (TMDs). In particular, he has investigated strong Coulomb interaction and many-body correlation in …

Unconscious bias unplugged

FLEET members at the 2019 annual workshop spent time looking into their own unconscious bias, with a view to better identifying and heading off this in-built, prevalent bias. To help FLEET become more aware of unconscious bias and other barriers to cultural and gender diversity, every FLEET member must attend at least one training workshop or training session in Equity, …

Poster Session 2

First nameSurnameTitlePoster Number DimitrieCulcerMagneto-resistance of topological edge states64 GolAkhgarInvestigating Electronic Structure of Intrinsic Magnetic Topological Insulator: MnBi2Te424 YonatanAshlea AlavaPatterning GaAs heterostructures using anodic oxidation towards the fabrication of Artificial Graphene32 PatjareeAukarasereenont2D TeO2 - a novel high mobility wide bandgap semiconductor22 SemontiBhattacharyyaTowards contacting monolayer TMDC through touch-printed Ga2O3 tunnel barriers16 OlivierBleuQuantum theory of a weakly interacting exciton-polariton condensate44 Shao-YuChenIn situ monitoring ...

Poster Session 1

First nameSurnameTitlePoster Number WafaAfzalMn3Sn films27 GolAkhgarSignatures of Helical Edge Transport in Millimetre-Scale Thin Films of Na3Bi3 ShivananjuBannur NanjundaUltrasensitive and ultrafast optical biosensors based on 2D materials53 TommyBartoloInterplay of Aharonov-Bohm interference and signatures of Majorana fermions25 GaryBeaneTowards the THz time-domain spectroscopy of graphene21 PankajBhallaResonant photovoltaic effect in doped magnetic semiconductors45 SamuelBladwellValley separation via trigonal warping49 MarinaCastelliSurface assisted molecule-molecule hybridization15 Shao-YuChenMany-body correlation ...