CMSP

Europe/Rome 2019-01-22 11:00:00 2019-01-22 12:00:00 Joint ICTP/SISSA Statistical Physics Seminar: Algebraic localization of disordered long-range quantum models Several atomic, molecular, and optical systems, as well as certain condensed matter models, exhibit long-range interactions that decay with distance r as a power law 1/rα. In this talk, we will present recent results for the localization properties of correlation functions of these long-range quantum models in the presence of disorder. The latter is usually associated with exponential localization of wave functions and correlations. We demonstrate that in most situations in 1D power-law interactions imply algebraic decay of correlations. We will discuss the generality of these results and their application to experiments in atomic and molecular physics. SISSA, Via Bonomea 265 ICTP pio@ictp.it 22 Jan 2019

Europe/Rome 2019-01-25 11:00:00 2019-01-25 12:00:00 Condensed Matter and Statistical Physics Seminar: Identical Suppression and Universality of the Hall Response in Interacting Quantum Lattices The Hall effect is known as the voltage drop V perpendicular to the current I and magnetic field B (perpendicular to I) measurable in electric conductors. Its importance relies in the fact that, at weak field, the Hall constant R_H= V/IB ~ -1/nq and measures the charge q and density n of charge carriers. Nevertheless, its calculation remains an open problem in strongly correlated systems. We demonstrate the identical suppression of the Hall response in quasi two-dimensional ballistic lattices, which is robust to large variations of magnetic field, Fermi level, temperature, disorder and absence of particle-hole symmetry. This suppression is unexpected and we show its relation to the topological properties of the Fermi surface: namely its central charge. We show that this suppression is commonly achieved in standard (Landauer) quantum transport settings and we rely on DMRG to show that our results equally apply to strongly interacting regimes [1]. Time permitting, I will also discuss how, in some particular cases, interactions do not affect the Hall response at all, universally leading to the non-interacting result R_H=-1/nq. [1] Michele Filippone, Charles-Edouard Bardyn, Sebastian Greschner and Thierry Giamarchi. To appear soon [2] Sebastian Greschner, Michele Filippone and Thierry Giamarchi arXiv:1809.10927 ICTP ICTP pio@ictp.it 25 Jan 2019

Europe/Rome 2019-01-29 11:00:00 2019-01-29 12:00:00 Joint ICTP/SISSA Statistical Physics Seminar - Topology, Symmetry, and Anomalies: Investigating Domain Wall Physics in Quantum Hall Nematic States I will present  recent work on ferromagnetic quantum Hall states that form on (111) surfaces of elemental Bismuth in high magnetic fields. This unusual states of matter combine the topological features of quantum Hall states with orientational symmetry breaking characteristic of nematic order.  Recent scanning tunneling microscopy measurements have directly visualized the spontaneous formation of boundary modes between distinct nematic domains and investigated their electronic structure [1]. I will demonstrate that these boundary modes belong to a new class of `symmetry-protected’ Luttinger liquid that arise from the interplay of symmetry-breaking with quantum Hall physics, and that they provide a concrete  realization of `anomaly inflow’ [2]. The analysis reveals strikingly different behavior of domain wall transport at quantum Hall filling factor $\nu=1,2$, in striking agreement with the STM results. I will explore implications of these ideas for the global phase diagram of quantum Hall valley nematics [3]. References: 1. M.T. Randeria, K. Agarwal, B. E. Feldman, H. Ding , Huiwen Ji3 , R. J. Cava , S. L. Sondhi , S. A. Parameswaran, A. Yazdani, under review 2. K. Agarwal, M.T. Randeria, A. Yazdani, S.L. Sondhi, S.A. Parameswaran, arXiv:1807.10293 3. S.A. Parameswaran and B.E. Feldman, arXiv:1809.09616 ICTP ICTP pio@ictp.it 29 Jan 2019

Europe/Rome 2019-01-31 11:00:00 2019-01-31 12:00:00 ICTP Seminar Series in Condensed Matter and Statistical Physics: Phase Transitions under Drive What is the nature of phase transitions in driven quantum systems? We address this question in two opposite regimes, a rapidly periodically driven Floquet system coupled to a bath and a slowly driven one, within a non-equilibrium renormalization group approach. In the periodically driven case, the infinitely rapidly driven limit exhibits a second order phase transition analogous to a multi-mode laser. However, we reveal that fluctuations turn the transition first order when the driving frequency is finite. This can be traced back to a universal mechanism, which crucially hinges on the competition of degenerate, near critical modes associated to higher Floquet Brillouin zones, in some analogy to the Halperin-Lubensky-Ma or Coleman-Weinberg mechanism. A physical picture is that of a fluctuation induced many-body Kapitza pendulum. The critical exponents of the infinitely rapidly driven system -- including a new, independent one -- can yet be probed experimentally upon smoothly tuning towards that limit. The opposite, slowly driven limit, is governed by the Kibble-Zurek mechanism of diabatic freeze out of the divergence of the correlation length. Recasting this problem in a systematic RG formulation, we show that the slow drive can be used to resolve not only the leading critical exponents of the underlying equilibrium problem, but the full critical exponent spectrum. ICTP ICTP pio@ictp.it 31 Jan 2019

Europe/Rome 2019-01-14 07:00:00 2019-01-18 21:00:00 Workshop on Crystal Structure Prediction: Exploring the Mendeleev Table as a Palette to Design New Materials | (smr 3267)      Several million chemical compounds are known, but with 118 chemical elements the number of compounds that are stable and could be synthesized is potentially much larger.    The Workshop focuses on recent developments in the prediction of crystal structures by computational methods.   Thanks to enormous progresses in computational power and in algorithm development, we are now closer to the possibility to predict the structure of a material from the simple knowledge of its composition. This Workshop will be dedicated to presenting and discussing the algorithms for in-silico crystal structure prediction that were developed in the last years, focusing in particular on the approaches based on molecular modeling.      We find particularly appropriate holding this conference in 2019, the International Year of the Periodic Table, since crystal structure prediction is rooted in a deep knowledge of the properties of the atoms.      The Workshop will be divided into two parts: the first 3 days will be dedicated to an advanced discussion of the latest advances in the field and last 2 days will be dedicated to hands-on tutorials with structure prediction methods in combination with electronic structure and atomistic methods.      A Poster Session will also be organized, and interested candidates are invited to upload a short abstract of their proposed posters during the application process (max. half page, in pdf format). Poster presentation is not mandatory, however participants are encouraged to present their results.   Topics: Genetic algorithms Random search algorithms Metadynamics Machine learning methods Nucleation Atomistic methods and force fields Electronic structure methods   There is no registration fee. We acknowledge Psi-k generous co-sponsorship ICTP Workshop Secretariat: smr3267@ictp.it * * * ICTP ICTP pio@ictp.it 14 Jan 2019 - 18 Jan 2019

Europe/Rome 2019-02-18 07:00:00 2019-02-22 21:00:00 Advanced School on Ubiquitous Quantum Physics: the New Quantum Revolution | (smr 3273) The fast growing use of quantum theory in technology-oriented and information-related fields is attracting the interest of an increasing number of researchers, especially young ones. The reborn interest in quantum physics has created a unique framework in which theoretical and experimental physics can fruitfully dialogue with information theory and computer science. The School intends to convey such an interdisciplinary spirit to graduate students and young researchers and will focus upon three themes, i) Quantum dynamics in the macro-world: quantum coherence and entanglement ii) Quantum theory as an interdisciplinary paradigm: quantum information and simulation iii) Quantum physics as a technology boost: quantum devices and machines emphasizing their inter-relations and covering the relevant background material, that will be taught by nine renowned experts in the above fields. The School is followed by a more specialized Workshop in which students attending the School are invited to participate. The Workshop Web page is http://indico.ictp.it/event/8662/ ICTP ICTP pio@ictp.it 18 Feb 2019 - 22 Feb 2019

Europe/Rome 2019-02-25 07:00:00 2019-03-01 21:00:00 Workshop on Ubiquitous Quantum Physics: the New Quantum Revolution | (smr 3371) The fast growing use of quantum theory in technology-oriented and information-related fields is heralding a new technological revolution based on the fruitful dialogue among theoretical and experimental physics, information theory and computer science. The Workshop follows a School of the same title focussing from a more specialized perspective upon the same three topics: i) Quantum dynamics in the macro-world: quantum coherence and entanglement ii) Quantum theory as an interdisciplinary paradigm: quantum information and simulation iii) Quantum physics as a technology boost: quantum devices and machines. Aim of the Workshop is to bring together experts that will present their latest developments thus providing all participants, among them students who attended the School, with a unique venue for sharing and discussing novel trends and ideas, integrating the fundamentals with the ongoing state of the various disciplines. The School Web page is http://indico.ictp.it/event/8648/ ICTP ICTP pio@ictp.it 25 Feb 2019 - 1 Mar 2019

Europe/Rome 2019-03-11 07:00:00 2019-03-15 21:00:00 Conference on Modern Concepts and New Materials for Thermoelectricity | (smr 3269)   THIS CONFERENCE IS CO-SPONSORED BY: MAGENTA - MAGnetic nanoparticle based liquid ENergy materials for Theromoelectric device Applications. MAGENTA project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 731976.   More information on MAGENTA website:  https://www.magenta-h2020.eu   --- The purpose of this Conference is to bring together experts and active researches working on fundamentals of thermoelectricity, new thermoelectric materials and applications. Tutorial lectures by experts in  field are planned in the beginning of each topical session. There is no registration fee. Topics Thermoelectricity is now a subject of rising interest caused by the fundamental significance, technological development in creating new materials and applications both in physics and engineering. The purpose of this Conference is to bring together experts in fundamentals of thermoelectricity as well as those of materials science and applications. The list of topics to be discussed includes: • Seebeck effect as a tool for studying topological transformations of the Fermi surface in heavy fermion systems and other materials • Thermoelectric and thermo-spin-related phenomena in Dirac and Weil materials • Thermoelectric and thermomagnetic phenomena in nanodevices • Thermo-electric and thermomagnetic phenomena in superconductors • Anomalous Nernst effect and the Berry phase • Figure of merit and the ways to increase it • New materials: nanostructured metals (bismuth chalcogenides, half Heusler alloys, oxide compounds, silicon-germanium alloys) • Specifics of the Seebeck effect in electrolytes • Thermo-electrochemical reactions • Thermo-electrodiffusion in soft condensed matter • Applications of thermoelectricity in engineering Preliminary list of speakers Kamran BEHNIA, ESPCI Paris Kakoli BHATTACHARYA, CEA Saclay Maciej BOBROWSKI, Gdansk University of Technology Jorge GARCÍA-CAÑADAS, Universitat Jaume I, Spain Xavier CRISPIN, Linköping University Benoit FAUQUÉ, ESPCI Paris Yuri GALPERIN, University of Oslo Andreas GLATZ, Argonne National Laboratory/NIU Christophe GOUPIL, Université Paris Diderot Valeriy GUSYNIN, Bogolyubov Inst. for Theoretical Physics Koichi IZAWA, Tokyo Institute of Technology Ahron KAPITULNIK, Stanford University Herbert KEPPNER, Haute Ecole-Arc, Switzerland Michail KISELEV, ICTP Georg KNEBEL, CEA Grenoble Yakov KOPELEVICH, UNICAMP, Brazil Yo MACHIDA, Tokyo Institute of Technology Yukka PEKOLA, Aalto University, Finland Régine PERZYNSKI, Sorbonne Université Vladimir PUDALOV, Lebedev Physical Institute, Moscow Mauro SGROI, Centro Ricerche Fiat, Italy Sergei SHARAPOV, Bogolyubov Inst. for Theoretical Physics Valerii SHIKIN, Institute of Solid State Physics,Chernogolovka Simone WIEGAND, Forschungszentrum Jülich Alois WÜRGER, Université de Bordeaux Zengwei ZHU, Huazhong Univ. of Science and Technology Veljko ZLATIC, Institute of Physics, Zagreb - - - Secretariat: smr3269@ictp.it   ICTP ICTP pio@ictp.it 11 Mar 2019 - 15 Mar 2019