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News Archive
12/2022: I gave an invited talk at the听听on "Engineering dynamical and topological phase transition from a non-Hermitian perspective".听
12/2022: I am really happy to announce that I was awarded the听.听
10/2022:听Thore Posske, Mircea Trif and I are organizing the听听on the interplay between topology, spin systems, and superconductivity. The conference will听 be held in person at the National Museum of Iceland,听 in the heart of Reykjav铆k.听
We have secured 32 invited speakers, but we have听 still few slots available for contributed talks and poster presentations: you are welcome to apply for one on them on our听!
10/2022: I gave a听听titled "Exceptional points as signatures of topological and dynamical phase transitions of the magnetization dynamics" at the听. Thanks for the invitation Giovanni!
10/2022: I听I gave a seminar titled听"New phenomena in dissipative magnetic systems"听听at听the UCCS. Thanks for the great visit听Ezio and Dima!
9/2022: Our听听is out! In this work, we review the progress resulting from applying non-Hermitian theories to the dynamics of both pure and hybrid magnonic systems, and we offer our perspective on future research.
8/2022: I gave an invited talk at the听听 on "Unveiling听 new phenomena in dissipative magnetic systems".
7/2022: Our paper听听听is out! In this work, we show that layered 2d听magnets driven by spin current injection can host a multitude of EPs, which can likely influence the response functions routinely probed in spintronics setups. Furthermore, we unveil a peculiar听k-dependent pseudo-Hermiticity and topological insulating phases analogous to the model's Hermitian counterpart.听
7/2022: Our paper听听is out!听听Recently, a colossal magnetoresistance (CMR) was observed in a听听that does not fit the conventional mixed-valence paradigm.听, we suggested a magnetic BKT transition as the mechanism underlying听 the dramatic increase in the temperature-dependence magnetoresistance. In this work,听 using Montecarlo techniques, we explore the magnetic phases of听Eu-based A-type antiferromagnets and听provide听qualitative numerical evidence that the effect听can be听related to a magnetic BKT transition.
6/2022: I gave a talk titled听"New phenomena in dissipative magnetic systems"听听at the Sol-SkyMag 2022 Conference in San Sebastian.
6/2022:听 I gave a seminar titled听"New phenomena in dissipative magnetic systems"听听at La Sorbonne University in Paris. Thanks for the great visit Massimiliano!
5/2022: Our paper听听is out! In this work, we show every ionic crystal in a magnetic field has a sizable Hall viscosity, independent of phonon coupling to external degrees of freedom.
5/2022:听 I gave an invited talk at the听Spin Caloritronics 2022听conference in Urbana-Champaign on new phenomena听in dissipative magnetic systems.听
5/2022:听听I gave an invited talk at the听2022 MRS Spring Meeting听in Honolulu on topological phases in dissipative magnetic systems.听
5/2022:听Our paper听听is out! In this work, we investigate听the听 interplay between linear and nonlinear spin dynamics in proximity of exceptional points.听
4/2022: I gave an (online) talk at Manchester University on topological phenomena in dissipative systems. Thanks Angelika for the invitation!
3/2022: I gave an听invited talk听at the 2022 March Meeting titled "Charged defects and phonon Hall effects in ionic crystals". The giant thermal Hall conductivities measured recently in dielectric oxides with different crystalline structures and unalike magnetic and ferroelectric orders (or lack of thereof) are a truly fascinating puzzle.听 If you are interested, here a link to听听.听 Thanks to Louis for organizing this APS session!
2/2022:听I am really happy to announce that our application to host the听听in 2024 at 艾可直播 College,听 in partnership with Wellesley College, has been accepted!
1/2022: Our paper听听is out! In this work, we investigate the non-linear and finite-temperature dynamics of a spin-torque oscillator array that realizes a non-Hermitian听topological听phase. Our results show that the topologically-protected lasing edge mode dynamics can persist for a broad range of temperatures and parameters.
1/2022: I gave an in-person seminar titled "Magnetic topological phases in dissipative systems" at Ohio State University. Thanks for the wonderful visit Jos and Yuanming!
1/2022:听Our paper听听has been published on Science Advances!听
2/2022: This year I have coordinated the inclusion of the physics department into the听Women in Science program at 艾可直播 College.听This initiative targets female students from 艾可直播-area high schools, with the goal of sparking their interest in science at an early age and of introducing them to female role models. Many thanks to Alenna, Bryan, and Faranak who have served as volunteers in our event and to all the help provided by Malavika.
12/2021: Our Women in Physics Group at 艾可直播 College has been awarded听an APS WiP Group Grant!
12/2021: I am really happy to announce that I was awarded the听NSF CAREER听award! This grant offers us continuing support (2022-2027) for our research on听Magnetic topological phases in dissipative systems.听
9/2021:听I gave a听seminar听titled "Magnetic topological phases in dissipative systems听" at Columbia University.听听Thanks for the invitation!
9/2021: I gave a talk titled "Magnon-polarons in magnetic insulators" at the听Virtual DPG Meeting 鈥淪KM21鈥�. In this talk, I discuss听the effects of strong magneto-elastic coupling on the transport properties of magnetic insulators and show that the听听can be attributed to the magnon-phonon interaction. For more details, click听.
9/2021: Our paper "Non-Hermitian skin effect in magnetic systems" is out! In this work, we show that the non-Hermitian skin effect, whose emergence is in two- or higher-dimensional solid-state systems remains largely unexplored, can appear in a van听der Waals magnetic monolayer听in a magnetic system due to intrinsic spin-spin and spin-phonon interactions. Moreover, we propose a guiding principle to predict the emergence of the skin effect and its dependence on the system鈥檚 parameters.听 For more details, click听.
9/2021: I gave a talk titled "Magnetic topological phases in dissipative systems听" at the听on-line SPICE-SPIN+X spintronics seminars. In this talk, I discuss听how the recent introduction of non-Hermitian topological classifications has opened up opportunities for engineering topological phases in magnetic systems, and I present听.听 Furthermore, I discuss the conditions under which magnetic insulating systems can host one of the most striking non-Hermitian phenomena with no Hermitian counterpart, i.e., the skin effect, which underlies the breakdown of the bulk-edge correspondence. For the video, click听.
9/2021: Our NGP collaboration focused on MonteCarlo simulations of spin systems with听听has officially started.听
8/2021: This fall semester I will be teaching the graduate-level class "Topology in condensed matter".
7/2021: Our paper "Charged Defects and Phonon Hall Effects in Ionic Crystals" is out!听Recently the striking observation of giant thermal Hall signals in many insulating oxides,听, has stimulated great interest. While it is clear听 now听 that phonons are the main heat carriers, the mechanism responsible for the enhanced magnitude of the thermal Hall signal at high magnetic fields remains puzzling. Up to now, most theoretical proposals that have addressed this puzzle rely on the coupling of phonons to a surrounding spin or electronic environment. 听 听 听 听 听 In this work, we propose an alternative mechanism based on phonon scattering on extrinsic impurities that break time-reversal symmetry. For more details, click听.
7/2021: Our paper "Magnetoresistance driven by the magnetic Berezinskii-Kosterlitz-Thouless transition" has been accepted for publication! Recently, a temperature-dependent colossal magnetoresistance听 was measured in the antiferromagnetic EuCd2P2. Motivated by this experimental discovery, in this work we investigate the interplay between electronic and magnetic degrees of freedom near the BKT transition and we show that a colossal magnetoresistance is consistent with an exponential proliferation of topological defects. For more details, click听.
4/2021: Our review "Magnonics in collinear magnetic insulating systems" has been听promoted to a听Featured Article听in the Journal of Applied Physics! In this work, we听provide a pedagogical introduction to theoretical and experimental advances in the study of magnonics in collinear magnetic insulating systems. For more details,听听click听.
3/2021: I gave an online听CMT Kids' Seminar听at Harvard University, titled "Unveiling new phenomena in magnetic systems".
1/2021: I gave an online Seminar at Aachen University, titled "Unveiling new phenomena in magnetic systems".
1/2021: Our paper "Floquet engineering of topological transitions in a twisted transition metal dichalcogenide homobilayer" has been chosen as Editor's Suggestions in Phys. Rev. B! In this work, we study听twisted transition metal dichalcogenide bilayers driven by different forms of monochromatic light. For more details, click听.听
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8/2021:听We had听our first social meeting for female undergraduate and graduate students at 艾可直播 College! If you want to join, we will be听meeting every first Monday of the month at 5pm.听
I am currently searching for undergraduates that would like to join with me the initiative听Women in Science at 艾可直播 College. This initiative targets female students from 艾可直播-area high schools, with the goal of sparking their interest in science at an early age and of introducing them to potential female role models in science. If you are interested in discussing more, drop by my office or send me an email at flebus@bc.edu.
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8/2021: Our paper "Spin interactions and topological magnonics in chromium trihalide CrClBrI" is out! Recently, experimental work has shown the discrete lattice symmetry and degree of anisotropy of spin-spin interactions in chromium halides can be tuned by changing the relative composition of halide atoms. Motivated by this advancement, here we derive a model chromium trihalide CrClBrI. For more details, click听here.听
6/2021: I gave a talk titled "Entangling Distant Spin qubits via a Magnetic Domain Wall" at听NSF Virtual Workshop on Emerging Opportunities at the Intersection of Quantum and Thermal Sciences. In this talk, I discuss听a scheme to entangle distant spin qubits, such as NV centers, via the soft modes of an antiferromagnetic domain wall. For more details on this proposal, click听听.听
11/2020: Our paper "Quantum Sensing of Spin Transport Properties of an Antiferromagnetic Insulator" is out! This theoretical/experimental collaboration shows听the potential of NV centers in diagnosing听spin transport properties in a broad range of high-frequency magnetic materials, which are challenging to access by more conventional measurement techniques. For more details, click听.听
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11/2020: I gave a talk titled "Non-Hermitian topology of 1D spin-torque oscillators arrays" at the SPICE workshop on听Coherent order and spin transport in spin-active systems.听In this talk, I听present听.听For the video, click听.
9/2020: I have officially started an Assistant Professor position at 艾可直播 College! This semester I will teach the graduate-level course "Topology in Condensed Matter".听听20s