Category Archive

Controlling interactions between two-dimensional (2D) materials and their substrate is critical if the properties of these materials are to be exploited in new technologies. One of the most dramatic examples of the influence of a substrate is the Kondo effect, in which local magnetic moments are screened by conduction electrons of a host metal. Here, we synthesise a 2D kagome …

Heavy objects like trucks, trains and shipping containers are typically weighed using devices known as weighbridges, which determine an object’s mass by measuring its downward force due to gravity. Unfortunately, these devices are slow to use, usually immobile, and provide no information about how mass is spatially distributed within the object. We propose a technology that will instead weigh large …

I will summarise our achievements of the last few years in the areas of 2D metal-organic nanomaterials for electronics, and broadband THz conductivity of electronic and optoelectronic materials. About the presenter A/Prof Agustin Schiffrin is an ARC Future Fellow. He investigates optically driven topological phases of materials by means of state-of-the-art ultrafast photonics, pump-probe spectroscopy and time-resolved scanning probe microscopy …

Josephson junctions are the key components used in superconducting qubits for quantum computing. The advancement of quantum computing is limited by a lack of stability and reproducibility of qubits which is likely to originate in the disordered oxide tunnel barrier in the Josephson junctions that constitute the qubits. Pinholes have been suggested as one of the possible contributors to these …

Scanning Tunnelling Microscopes (STM) are capable of obtaining images of surfaces with atomic scale resolution. They accomplish this by scanning an atomically sharp probe across the surface of a sample while monitoring an electric current. The quality of STM images depends greatly on the exact geometry and composition at the apex of the scanning probe. Blunt tips result in blurry …

The excitonic resonances in 2D TMDs are known to be dependent on magnetic field, often described with a simplified Hamiltonian featuring a diamagnetic term quadratic in B. This simple picture is sufficient for 1s excitons in realistic laboratory conditions, however it fails to capture the behaviour of higher order excitons even at moderate magnetic field strength. In this work we …

TBA About the presenter Feixiang Xiang is a Research Fellow at UNSW with CI Alex Hamilton. He is studying the emergent physical properties of topological matter using quantum transport measurements, as part of FLEET’s Research Theme 1, Topological Materials.

The charge density wave (CDW) is an example of a low temperature phase of matter which occurs due to strongly correlated electrons. CDW materials are characterised by a periodic distortion of the atomic lattice, periodic modulation of the electronic charge distribution, and a complex order parameter. These materials have potential application in mechanical vibration detectors, optoelectric devices, information processing, memory, …

The electron skew scattering by impurities is one of the major mechanisms causing the anomalous Hall effects in semiconductor nanostructures. In this Letter, we argue that in plasmonic setups the skew scattering of plasma waves can be engineered to be giant and observed directly via near-field probes. In particular, we consider the scattering of plasma waves in gated two-dimensional electron …

Topological materials are promising for future low energy electronic device applications. These materials have been predicted to exhibit ballistic transport along their 1D edge. However, experiments have revealed higher resistance than expected. We aim to characterise the scattering mechanisms causing this resistance in WTe2, a topological material. About the presenter Daniel McEwan is a PhD Student at Monash University with …

Here, we demonstrate up-conversion photoluminescence of optically forbidden (dark) excitons in few-layer transition metal dichalcogenides. Transition metal dichalcogenides were mechanically exfoliated onto sapphire substrates using a dry transfer technique. We show that the resonance between up-converted excitons and the bright exciton state at Γ valley results in a strongly enhanced photoluminescence, evidenced by temperature, layer and excitation dependent photoluminescence measurements. …

Overview of recent exciting results on room temperature condensation of exciton-polaritons and Optical Pump Terahertz Probe (OPTP) results in graphene. About the presenter Gary Beane is a Research Fellow working with A/Prof Agustin Schiffrin at Monash University, where he is investigating optically driven topological phases of matter using terahertz time domain spectroscopy and ultrafast pump-probe spectroscopy. He is mainly involved …

A long standing puzzle has been resolved… About the presenter CI Prof Oleg Sushkov leads two theoretical investigations within Research Theme 1: (i) Artificial nanofabricated materials including artificial topological insulators. (ii) Laterally modulated oxide interfaces. Within Research Theme 3 Sushkov also participates in studies of theoretical many-body physics aspects of exciton condensates and cold atoms aimed at support of the …

Magnetic and polar vortices hold tremendous power to revolutionize memory devices. Formation of magnetic vortices in magnetic systems and polar vortices in ferroic films have already been shown. However, unlike magnetic vortices, controlled motion of the polar vortex has not been achieved yet. Here, we show electric-field controlled – reversible and repeatable motion of spontaneously created polar vortex across the …

Liquid metal alloys are an ever growing industry with a myriad of potential applications such as catalysis, and electronics.1 Unfortunately, the full potential of these materials are under-utilised and is outside the scope of other research parameters.2 Herein, nanodroplet alloyed materials are probed and investigated with the use of a Transmission Electron Microscope (TEM), thus unlocking the potential these materials …

The surfaces of liquid metals can serve as a platform to synthesise two-dimensional materials. By exploiting the self-limiting Cabrera-Mott oxidation reaction that takes place at the surface of liquid metals exposed to ambient air, an ultrathin oxide layer can be synthesised and isolated. Several synthesis approaches based on this phenomenon have been developed in recent years, resulting in a diverse …

Atomic-scale quantum systems based on individual point defects and colour centres have become key elements in emerging quantum technologies, with applications in quantum sensing, computation, simulation, and communication. Different from conventional 3D semiconductors, electron (or hole) spins in atomically-thin (2D) semiconductors with hexagonal lattices [1], are coupled to an additional valley degree of freedom [2] in the presence of inversion …

Photoemission is the most information rich and widely used techniques for the elucidation of the electronic structure, surface states and chemistry of materials. The NanoESCA III, recently commissioned in Flinders Microscopy and Microanalysis, is a photoemission electron microscope (PEEM) and angle resolved photoemission spectrometer (ARPES). In PEEM mode it images surfaces by focusing and detecting electrons emitted from a material …

CSIRO is Australia’s national science agency tasked with addressing the nation’s greatest challenges through innovative scientific solutions. In recent years, CSIRO has invested heavily in quantum science and technologies via a range of programs that span quantum computing, sensing and communications. In this presentation, I will give an overview of the research and goals of CSIRO’s quantum activities, particularly within …

I will present on recent results in our group on 1) room temperature condensation of exciton-polaritons in perovskite-DBR microcavities and 2) Broadband optical-pump THz probe (OPTP) results with graphene. About the presenter Gary Beane is a Research Fellow working with A/Prof Agustin Schiffrin at Monash University, where he is investigating optically driven topological phases of matter using terahertz time domain …

Oscillation effects in crystals have been studied since the 1930s, when it was observed that a metal’s magnetisation and resistance are periodic in the inverse magnetic field. Typically, the oscillation frequency corresponds to the area of a closed cross-section of the Fermi surface, these are Onsager oscillations. We show that oscillations arise, in equilibrium, which do not correspond to any …

The interplay of the topology of electronic wavefunctions with spin configurations in intrinsically magnetic topological insulators (TIs) causes various exotic topological states, which attracts much attention in condensed matter physics. In this work, we study the magnetic and electronic properties and edge states of two-dimensional CoBi2Te4. Based on our density functional theory and tight-binding calculations, CoBi2Te4 films are predicted to …

About the presenter Brendan is working with CI Meera Parish to investigate the dynamics of excitons in two-dimensional semiconductors, with a particular focus on spectroscopic probes and the effect of electron doping or large carrier densities. to characterise the topology of an exciton-polariton system and to show how to calculate and measure its quantum geometric tensor (including complex Berry curvature). …

About the presenter Yow-Ming (Robin) Hu is a PhD student working with Chief Investigator Elena Ostrovskaya. Her project aims to characterise the topology of an exciton-polariton system and to show how to calculate and measure its quantum geometric tensor, including complex Berry curvature. This works towards a key objective of FLEET Research Theme 2 Exciton Superfluids to observe, theoretically and …

Optical properties of dark excitons in transition metal dichalcogenides (TMDs) have been received lots of attention due to its significant role in fundamental properties of exciton physics. Here, we demonstrate up-converted photoluminescence (PL) in few-layer WSe2 through exciton-exciton annihilation of intervalley dark excitons. WSe2 was mechanically exfoliated onto silicon substrates with 285-nm-thick SiO2 using a dry transfer technique. We performed …

Panel Discussion – Got PhD, What Next? Unveiling the FLEET Journey Join Tich-Lam for a discussion with four FLEET alumni as they reflect on their experiences with FLEET. This panel will take you on a journey through their professional growth, starting from their training and development and extending to their job search experiences.  Through the conversation, we’ll gain a deeper …

About the presenter Dr Steven Duvall is an independent semiconductor expert, he has been working in the semiconductor industry for over 40 years. He was Silanna’s Chief Technology Officer and General Manager of Technology Development for 14 years, where he led the research, development and commercialisation of new semiconductor manufacturing technologies and products. Prior to joining Silanna, Dr Duvall was …

About the presenter Dr Muhammad Nadeem is a Research Associate at University of Wollongong where he studies theory of 2D Chern/Z2 topological insulators with focus on Chern magnetism, role of various spin-orbit interactions, topological Skyrmion/Meron spin/pseudospin textures, and dissipationless transport. Working with CIs Xiaolin Wang, Dimi Culcer, Alex Hamilton and Michael Fuhrer, his PhD project on exploring applications of 2D …