Category Archive

About the presenter Prof Francesca Iacopi has over 20 years’ industrial and academic research expertise in semiconductor technologies, with over 130 peer-reviewed publications and 9 granted US patents. She is currently head of Communications and Electronics, in the Faculty of Engineering and IT, UTS. Her research focuses on the translation of basic scientific advances in nanomaterials and novel device concepts …

About the presenter Bianca is a PhD candidate in CI Elena Ostrovskaya‘s group. Her project aims to realise, experimentally, exciton polaritons in artificial lattices and observe novel topologically protected states. This work fits the FLEET Enabling Research Theme 2, Exciton Superfluids.

About the presenter Mitko Oldfield is an experimental physicist specialising in terahertz time-domain spectroscopy and exciton-polariton condensation, working with A/Prof 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 …

About the presenter Kenneth is a PhD candidate in CI Meera Parish‘s group. His research aims to investigate the interactions between excitons (or exciton-polaritons), and 2-D electron gas, with a view to inducing a collective, dissipationless flow of charged bosons: exciton-mediated superconductivity.

 TBA About the presenter TBA

 We have mapped the phase diagram of epitaxial MnSi films grown on Si(111) by magnetometry, differential susceptibility, extended X-ray absorption fine structure, planar Hall, polarised neutron reflectometry and small-angle neutron scattering [1-3]. Our experimental results are supported by micromagnetic simulations, which jointly reveal a magnetic phase diagram dominated by a field-induced cascade of single-Q soliton layers. The soliton layers are …

 Topological insulators (TIs) possess conductive surface states and insulating bulk properties. However, their limited operating temperatures hinder their practical implementation in everyday electronic devices. To tackle this challenge, we explore the potential of disordered TIs, which exhibit enhanced stability and increased defect tolerance. Here, we employed molecular beam epitaxy (MBE) and ion irradiation techniques at ANSTO to synthesize thin films …

 Our group focuses on the study of functional topological defects in ferroelectric (FE) and ferromagnetic (FM) materials via advanced scanning probe microscopy (SPM) techniques. Our research encompasses both exploring the underlying physics in domain walls, skyrmions and vortices of oxide and van der Waals (vdW) materials, as well as leveraging these novel functionalities for post-Moore’s law nanoelectronics, such as full …

In this work we use density functional theory plus dynamical mean-field theory (DFT + DMFT), to investigate in detail the electronic structures of 3D and 2D MnSn in the Ferromagnetic phase. We study the flat bands (FBs) in this material and discuss the composition, energetic position and correlation nature of these FBs. We also use a combination of first principles …

Mechanical friction leads to wear and energy dissipation, and its control is of high importance in new-generation miniature electromechanical devices. 2D materials such as graphene are considered to be excellent solid lubricants due to their ultralow friction and have attracted considerable research interest. Unique friction properties are discovered in various other 2D materials. However, the friction of functional van der …

Quantum gases with internal degrees of freedom give access to novel quantum vortex phases due to the interplay of mass and spin density-density interactions. Spin-1 Bose-Einstein condensates facilitate unusual vortex phenomenology as they are able to host different ground state phases which can in turn support vortex configurations with higher and even fractional winding numbers, such as polar core and …

About the presenter A/Prof Kirrily Rule is an internationally-recognized leader in understanding low-dimensional and frustrated magnetic materials. Within FLEET, Kirrily provides expertise in conducting experiments at ANSTO’s world-leading nuclear and synchrotron beam characterisation facilities for FLEET partner researchers. She is currently working with CI Xiaolin Wang and AI David Cortie in FLEET’s Enabling Technology A, atomically thin materials.

About the presenter Dr Eliezer Estrecho is a DECRA Fellow at the Australian National University and a Research Fellow of FLEET. His research interests are mainly on exciton-polariton condensates, non-Hermitian physics, and strong light-matter interaction, specifically between electronic excitations (excitons) and photonic modes.

About the presenter AI Shaffique Adam is currently an Associate Professor, Yale-NUS College and an NRF Fellow. A/Prof Adam is an expert in the theoretical physics of Dirac systems. Within FLEET, he is working on gaining an understanding of the electronic transport and other properties of novel Dirac semimetals, as well as the conventional insulator to topological insulator transition in …

Graphene, with its linear band dispersion at low energy and massless Dirac-like fermions, allows the Quantum Hall effect (QHE) to be observed at room temperature under a strong magnetic field[1]. In the QHE, electrons will travel in quantized cyclotron orbits with discrete energy levels called Landau levels (LLs). Yet, the massless Dirac-like behaviour of graphene provides a potential avenue to …

The quantum kicked rotor (QKR) is a system used to explore quantum chaos, which is extensively studied theoretically and experimentally. The QKR also has many flavours such as the single kicked rotor revealing localisation, delocalisation and anti-resonant behaviours. Moreover, it has the ability to expand to higher dimensions by the modulation of the kick strength with incommensurate frequencies resulting in …

Van der Waals (vdW) metal electrodes have been demonstrated as a promising approach to reduce the contact resistance and minimize the Fermi level pinning effect at two-dimensional materials. However, only a limited number of metals can be mechanically peeled off from a sacrificed substrate. In this work, we demonstrate a universal electrode pick-up technology for contacting two-dimensional (2D) semiconductors assisted …

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 n-layer WSe2 (n > 2) through exciton-exciton annihilation of dark excitons. Few-layer WSe2 were mechanically exfoliated onto silicon substrates with 285-nm-thick SiO2 using a dry transfer …

Using metal gates deposited in the wafer growth chamber reduces scattering from charge at the wafer surface, enhancing electron mobility and decreasing charge noise. This makes in situ grown gates ideal for a myriad of systems, from artificial lattices to quantum electronic devices such as quantum point contacts, quantum dots and quantum bits. About the presenter Yonatan Ashlea Alava is …

We identify a sizable nonlinear Hall effect of spin-3/2 heavy holes in zincblende nanostructures, driven by a quadrupole interaction with the electric field formerly believed to be negligible. The interaction is enabled by T_d-symmetry, reflects inversion breaking, and in two dimensions results in an electric-field correction to the in-plane g factor. The effect can be observed in state-of-the-art heterostructures, either …

We calculate the nonlinear response of 2D topological antiferromagnetic materials. We model the systems by a tilted Dirac cone. We find that the purely intrinsic contribution is strongly affected by disorder corrections such as side jump, skew scattering and Berry curvature dipole like. We discuss the effect of time reversal and inversion symmetry in such a system. About the presenter …

Recent advancement in fabrication of ultra-clean samples (in graphene and in semiconductor heterojunctions [1]) has led to the realisation of a new regime of electron transport previously unexplored, i.e, the hydrodynamic regime. In this work, the implications of hydrodynamic transport through interfaces with varying density profiles in 2DEGs are explored, as well as possible experimental realisation is discussed. [1] A. …

Using light to control non-equilibrium phenomena in quantum systems is at the forefront of condensed matter research. Here we utilise MDCS to create an inter-valley coherence in monolayer WS2 and measure the pump induced changes to the coherent exciton dynamics. About the presenter Mitchell Conway is a Research Fellow at Swinburne University with CI Jeff Davis. He just completed his …

Recent evidence suggests monolayer WTe2 could be an excitonic insulator. While this theory is controversial, if correct, the excitonic condensate should exhibit a charge density wave (CDW) and should collapse with electron doping. Through scanning tunnelling microscopy (STM) and angle-resolved photoelectron spectroscopy (ARPES) we display evidence of these phenomena and are making progress toward confirming their excitonic nature with theoretical …

Kagome metals (Mn3Sn, MnSn) with a two-dimensional network of corner-sharing triangles structure exhibit great potential in applications of future electronics and spintronics because of the unique combination of novel topological phases and high temperature magnetic ordering. Here, the ultra-thin Mn3-xSn film samples were successfully grown on Si(111) substrate by molecular beam epitaxy. And the crystal structure of the thin film …

Quantum phenomena such as tunnelling manifest in devices when the latter are scaled down to the nanoscale regime. Exploiting these effects in functional ferroic materials results in a new paradigm of memory devices, revolutionising current computer architecture. Indeed, the latter is plagued by the Von Neumann bottleneck, where the physical separation between computing and memory units leads to an inherent …

A superfluid transistor requires flow through a potentially disordered channel. This poster will provide an overview of research at UQ on the nonequilibrium flow of superfluids through two-dimensional channels. About the presenter Professor Matt Davis is a FLEET Chief Investigator at the University of Queensland. His research makes use of the methods of reservoirs and open quantum systems to drive …

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, …

In this work, we report the transport measurement of double aligned graphene heterostructures. We observe strong signature of Landau level fan of a second order moiré pattern due to the interference of the moiré patterns from top and bottom graphene surfaces. The periodicity of the second order moiré pattern is about double the maximum periodicity of moiré patterns in graphene …