Condensed Matter Seminar

Abstract: The antiferromagnetic ground state of the two-dimensional Hubbard model on a square lattice at half-filling was shown to become ferromagnetic with the addition of a single hole for infinite e-e repulsion (Nagaoka, 1966). However, Nagaoka ferromagnetism has not been seen in naturally occurring solid-state materials. The advent of synthetic platforms - atoms in optical lattices, and quantum dots/dopant clusters in semiconductors has led us to study Hubbard-like models on large finite lattices using DMRG techniques.

Abstract: I will present experimental studies on the topological and correlated properties of monolayer TaIrTe4. First, I will discuss a dual quantum spin Hall (QSH) insulator, arising from the interplay between its single-particle topology and density-tuned correlations. At charge neutrality, monolayer TaIrTe4 exhibits QSH insulator behavior, characterized by enhanced nonlocal transport and quantized helical edge conductance.

Abstract: The observation of superconductivity and correlated insulators in magic-angle graphene has ushered in the new paradigm of moiré materials, where two-dimensional materials are stacked and rotated to generate a variety of intriguing phases of quantum matter. Such physics is enabled by the confluence of band structure engineering, strong interactions, and electronic topology.

[EQI] Eddleman Quantum Institute Seminar Series

Abstract: Nanofluidic transport regime, where ions and molecules move through highly confined channels with molecular-scale dimensions, is important for many applications at the waterenergy nexus and beyond. Living systems have mastered nanofluidic transport: they move ions and small molecules across biological membranes using protein pores that rely on nanoscale confinement effects to achieve exquisite selectivity and efficiency.

Abstract: Advances in nanoscience have overcome materials compatibility issues and delivered novel functionalities. The progress has come with various nanomaterials, such as two-dimensional (2D) materials, nanowires, nanoparticles, and other hierarchical materials. There is no silver bullet as a universal solution for various applications. Therefore, heterostructuring to fabricate multi-dimensional or hybrid architectures, in which individual constituents’ properties are designed, is a common and promising way.

Abstract: Quantum twisting microscope (QTM) is a new and powerful platform to study in-situ twistronics and momentum-resolved band structure imaging of 2D materials. Further combining it with light allows probing the optical and optoelectronic properties of two layers of 2D materials stacked on top of each other with a tunable twist angle. In this talk, I will present the development of an optical quantum twisting microscope which is equipped with both vis-NIR lasers and home built Fourier transform infrared spectrometer.

Abstract: Quantum materials give us unprecedented access to a rich tapestry of complex properties that when harnessed allow us to overcome the intrinsic limitations of classical sensing, computing, and storage technologies. The underexplored intersection of strong spin-orbit coupling, electron-electron correlation effects, and local f-electron states provides fertile ground for discovery and the development of next-generation multifunctional quantum technologies. However, due to the vastness of the geometrical and compositional phase space we encounter an exponential wall.

Abstract: Unconventional phases in solids are predicted to arise when a Fermi surface is strongly coupled to bosonic excitations, such as phonons, spin- and density-wave fluctuations, and collective modes emerging in the vicinity of phase transitions. However, isolating relevant interaction channels is challenging, as electrons are typically coupled simultaneously to multiple bosonic modes.

[EQI] Eddleman Quantum Institute Seminar Series