Speaker: Adrian Kantian and Gunnar Bollmark (Uppsala University) Title: 1-D electrons coupled to reservoirs: towards new systems of correlated quantum matter and novel devices. Time: Wednesday, 2nd of […]
Speaker: Xiao-Jia Chen (Center for High-Pressure Science & Technology Advanced Research) Title: Discovery of superconductivity in phenyl molecules Time: Wednesday 6th of November, Fika 10:30-11:00 , Seminar 11:00-12:00, Place: Nordita South, room 112:028 . Abstract: Organic compounds are always promising candidates of superconductors with high transition temperatures Tc’s. In this talk, we […]
Date: Tuesday 28th April Time: 4pm Online via Zoom - stockholmuniversity.zoom.us/j/67021163168 (Meeting ID: 670 2116 3168) Title: Topological Magnons Abstract: I give an overview of the insights we and other […]
Speaker: Demitry Farfurnik (University of Maryland) (https://scholar.google.com/citations?user=ebOgrf0AAAAJ&hl=en) Location and time: Online @ 4pm Stockholm time Zoom Link: https://kth-se.zoom.us/j/61809414846 Meeting ID: 618 0941 4846 Abstract: Self-assembled Quantum Dots (QD) exhibit some of the best single photon emission properties, including nearly ideal efficiency and indistinguishability. As such, and considering their compatibility with nanofabrication techniques, on-chip integration of […]
Sang Wook Cheong (Rutgers) - Trompe L'oeil FerromagnetismZoom Link: kth-se.zoom.us/j/61226950287 Zoom ID: 612 2695 0287Date: Monday Nov 30Time: 17.30 Stockholm timeTitle: Trompe L'oeil FerromagnetismAbstract: The characteristics of ferro-(ferri)magnetism with non-zero magnetization include magnetic attraction, magnetic circular dichroism, and magneto-optical Kerr (MOKE), Faraday, and various anomalous Hall-type (Hall, Ettingshausen, Nernst, and thermal Hall) effects. Non-magnetic or […]
Seminar - Peter Litttlewood - Dynamical phase transitions at many body exceptional point Zoom Link: https://kth-se.zoom.us/j/67773156040 Zoom ID: 677 7315 6040 Date: Tuesday Dec 8 Time: 4pm Stockholm time Abstract: Michel Fruchart, Ryo Hanai, Peter Littlewood, and Vincenzo Vitelli Spontaneous synchronization is at the core of many natural phenomena. Your heartbeat is maintained because cells […]
Examining multi-band effects on the electronic compressibility of a 2D electron gas: Insights into the negative compressibility of LAO/STO In this study, we investigate the consequences of two electronic bands at the negative electronic compressibility (NEC) cross-over point for a two-dimensional electron gas (2DEG) using a simple homogeneous model with Coulombic interactions and first-order multi-band […]
Beyond BCS: An Exact Model for Superconductivity and MottnessHigh-temperature superconductivity in the cuprates remains an unsolved problem because the cuprates start off their lives as Mott insulators in which no organizing principle such a Fermi surface can be invoked to treat the electron interactions. Consequently, it would be advantageous to solve even a toy model […]
Spectral bulk-boundary correspondence of odd-frequency Cooper pairs Surface physics dominated by the bulk properties is attracting much attention. For example, bulk-boundary correspondence predicts topological surface states. Another important context where surface properties are determined by the bulk is the electric polarization: surface electric charge is the bulk property modulo a quantum . This fact might […]
Direct detection of odd-frequency superconductivity Odd-frequency superconductivity is a dynamical phenomenon. The time-dependence of the anomalous Green function matters. Therefore, a dynamical response is needed to directly detect odd-frequency superconductivity. We propose a novel type of detection scheme based on two-pulse, time-resolved ARPES noise measurements. Remarkably, the experimental response is directly proportional to the anomalous […]
Kekule spiral order in twisted bilayer graphene Twisted bilayer graphene has attracted a lot of attention due to the presence of correlated insulators proximate to superconductivity. In this talk I will present a new proposal for the nature of the correlated insulators. This order, which we dub the 'incommensurate Kekule spiral' (IKS) order, spontaneously breaks […]
Searches for dark matter and exotic astrophysics with networks of quantum sensors. As precision quantum sensors become ubiquitous, it is natural to combine them into networks. I will focus on searches for exotic physics signals with networks of quantum sensors. Most of my work is related to atomic clocks and I will give a general […]
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Theoretical Quantum Matter