Goethe-Universität

Hofstetter

QMTG

Seminar on Aspects of Quantum Matter Theory

Im Sommersemester 2023 findet das Arbeitsgruppenseminar donnerstags von 14:00 bis 16:15 im Seminarraum 2.114 statt. Im Seminar diskutieren wir Forschungsergebnisse unserer Arbeitsgruppe, sowie neue Veröffentlichungen und Entwicklungen in folgenden Themenbereichen: Ultrakalte Quantengase, Quantensimulation, Quantencomputing, Quantenoptik, und Quantenvielteilchensysteme. Interessierte Studierende sind herzlich willkommen, am Seminar teilzunehmen!

Our group seminar takes place every Thursday from 14:00 to 16:15 in room 2.114. Each seminar is devoted to presenting and discussing our recent research work, as well as recent publications and developments in the fields of ultracold gases, quantum optics, quantum simulation and quantum many-body systems. Interested students are very welcome to attend the seminar.

Please do not confuse our group seminar with the "Condensed Matter Theory Seminar", which is held each Friday at 15:15 in room 1.114.

SS23 WS22/23 SS22 WS21/22 SS21 WS20/21 SS20 WS19/20

Summer Semester 2023

Date	Speaker	Topic
13/04/23	Youjiang Xu	Status report: Topology in Quasicrystalline Kapit-Mueller Model
20/04/23	Arijit Dutta	Laughlin charge pump and edge state winding in the AFAI phase
27/04/23	Youjiang Xu	Topology in 2D Floquet system
04/05/23	Arijit Dutta	(cont.) Laughlin charge pump and edge state winding in the AFAI phase
11/05/23	Efe Sen	High-frequency approximation in Floquet systems
25/05/23	Youjiang Xu	Geometric interpretation and interpolation of many-body fermionic product states
01/06/23	Renan da Silva Souza
15/06/23	Arijit Dutta
22/06/23	Renan da Silva Souza
29/06/23	Efe Sen
06/07/23	Arijit Dutta
13/07/23	Youjiang Xu

Winter Semester 2022/2023

Date	Speaker	Topic
10/02/23	Youjiang Xu	Status report: Migrating GPU-RDMFT code from GoetheHLR to JUWELS
19/01/23	Arijit Dutta	Status report: The periodically driven topological Falicov-Kimball model within DMFT
08/12/22	Morad Ebrahimkhas	Status report: The Anderson-Haldane-Hubbard model
17/11/22	Youjiang Xu	Journal club: Topological pumping in a finite-size system
10/11/22	Arijit Dutta	Journal club: Broyden's method for solving self-consistent equations and its implementation within DMFT
03/11/22	Morad Ebrahimkhas	Status report
27/10/22	Youjiang Xu	Status report; The DPG meeting review
20/10/22	Arijit Dutta	Status report; The DPG meeting review

Summer Semester 2022

Date	Speaker	Topic
14/07/22	Morad Ebrahimkhas	Status report
	Youjiang Xu	Journal club: An introduction of topological states in quasicrystals
07/07/22	Arijit Dutta	Status report
	Teodora Niculae	Journal club: Encoding of Matrix Product States into Quantum Circuits of One- and Two-Qubit Gates
30/06/22	Morad Ebrahimkhas	Journal club: Metal-insulator transition in the disordered Hubbard model of the Lieb lattice
23/06/22	Arijit Dutta	Journal club: Probing finite-temperature observables in quantum simulators with short-time dynamics
09/06/22	Youjiang Xu	Status report: generalizing the single-site DMFT to approximate non-local self-energy by 1/d expansion
02/06/22	Youjiang Xu	Journal club: Imaging tunable quantum Hall broken-symmetry orders in graphene
19/05/22	Morad Ebrahimkhas	Journal club: Bosonic Bott Index and Disorder-Induced Topological Transitions of Magnons
12/05/22	Arijit Dutta ; Mathieu Barbier	Journal club: Breakdown of quantisation in a Hubbard-Thouless pump ; Breakdown of topological Thouless pumping in the strongly interacting regime ; Splitting of topological charge pumping in an interacting two-component fermionic Rice-Mele Hubbard model
05/05/22	Irakli Titvinidze	Journal club: Phase diagram of superconductivity in the integer quantum Hall regime
	Youjiang Xu	Journal club: Spectral functions of the half-filled 1D Hubbard chain within the exchange-correlation potential formalism
28/04/22	Morad Ebrahimkhas	Status report
	Teodora Niculae	Status report
21/04/22	Arijit Dutta	Journal club: Topological Frequency Conversion in Strongly Driven Quantum Systems
	Mathieu Barbier	Journal club: Accessing the topological Mott insulator in cold atom quantum simulators with realistic Rydberg dressing
14/04/22	Irakli Titvinidze	Hubbard model on the kagome lattice with time-reversal invariant flux and spin-orbit coupling ; Spin-orbit coupling in the kagome lattice with flux and time-reversal symmetry

Winter Semester 2021/2022

Date	Speaker	Topic
17/02/22	Arijit Dutta	Journal club: Anomalous Floquet-Anderson Insulator as a Nonadiabatic Quantized Charge Pump
10/02/22	Urs Gebert	Journal club: Realising the Symmetry-Protected Haldane Phase in Fermi-Hubbard Ladders
03/02/22	Youjiang Xu	"Invisible Flat Bands on a Topological Chiral Edge"
27/01/22	Mathieu Barbier	Journal club: Blackbody-radiation-induced facilitated excitation of Rydberg atoms in optical tweezers
	Morad Ebrahimkhas	Journal club: Connecting topological Anderson and Mott insulators in disordered interacting fermionic systems
20/01/22	Irakli Titvinidze	Journal club: Magnetic correlations around the Mott transition in the Kagomé lattice Hubbard model
13/01/22	Mathieu Barbier	Journal club: Self-generated quantum gauge fields in arrays of Rydberg atoms
16/12/21	Youjiang Xu	Journal club: Discovering hydrodynamic equations of many-body quantum systems
09/12/21	Irakli Titvinidze	Journal club: Dynamical mean-field theory of correlated hopping: A rigorous local approach
	Urs Gebert	Journal club: Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator
02/12/21	Arijit Dutta	Journal club: Floquet Engineering Correlated Materials with Unpolarized Light
	Morad Ebrahimkhas	Journal club: Interplay of interactions, disorder, and topology in the Haldane-Hubbard model
25/11/21	Irakli Titvinidze	"Falicov-Kimball model with Density dependent Peierls phase: DMFT study"
18/11/21	Arijit Dutta	"Falicov-Kimball model with Density dependent Peierls phase: QMC study"
	Youjiang Xu	"Emergent chiral symmetry and domain-wall states in quantum Hall ferromagnets formed by topological flat band with Hubbard interaction"
11/11/21	Mathieu Barbier	Journal club: Competition and interplay between topology and quasi-periodic disorder in Thouless pumping of ultracold atoms
	Morad Ebrahimkhas	"Emergence of antiferromagnetic Chern insulator in a centrosymmetric time-reversal-invariant system"
04/11/21	Irakli Titvinidze	Journal club: Local vs non-local correlation effects in interacting quantum spin Hall insulators
28/10/21	Youjiang Xu	Status report
	Mathieu Barbier	Journal club: Controlling quantum many-body dynamics in driven Rydberg atom arrays
21/10/21	Morad Ebrahimkhas	Journal club: Temperature-Driven Gapless Topological Insulator ; Extended Falicov-Kimball model: Exact solution for finite temperatures ; Extended Falicov–Kimball model: Exact solution for the ground state ;
	Arijit Dutta	Journal club: Measurement of Spin Chern Numbers in Quantum Simulated Topological Insulators

Summer Semester 2021

Date	Speaker	Topic
15/07/21	Morad Ebrahimkhas	Journal club: Higher-order topological insulators in a magnetic field
	Irakli Titvinidze	Journal club: Dynamical Cluster Approximation Study of Electron Localization in the Extended Hubbard Model
08/07/21	Mathieu Barbier	Journal club: Topologically protected edge states in small Rydberg systems ; Charge Excitation Dynamics in Bosonic Fractional Chern Insulators
	Arijut Dutta	Journal club: Double-Exchange Interaction in Optically Induced Nonequilibrium State: A Conversion from Ferromagnetic to Antiferromagnetic Structure
01/07/21	Youjiang Xu	"An introduction to the restructured R-DMFT code"
	Mathieu Barbier	Journal club: Observation of a symmetry-protected topological phase of interacting bosons with Rydberg atoms ; Realization of a Density-Dependent Peierls Phase in a Synthetic, Spin-Orbit Coupled Rydberg System
24/06/21	Arijit Dutta	"Nonequilibrium transport and dynamics in Mott insulators II"
	Morad Ebrahimkhas	AF-Chern insulator in time-reversal-invariant Harper-Hofstadter-Hubbard model
17/06/21	Martina Jung	Journal club: A learning algorithm with emergent scaling behavior for classifying phase transitions
10/06/21	Arijit Dutta	"Nonequilibrium transport and dynamics in Mott insulators"
	Mathieu Barbier	Status update
27/05/21	Youjiang Xu	"Building Flat-band Models via Gram Matrices"
	Urs Gebert	Journal club: Photoinduced anomalous Hall effect in the interacting Haldane model: targeting topological states with pump pulses
20/05/21	Irakli Titvinidze	Journal club: Simulating a ring-like Hubbard system with a quantum computer
06/05/21	Youjiang Xu	"Realizing Multicriticality in Generalized Dicke Models "
	Martina Jung	Journal club: Transverse spin dynamics in the anisotropic Heisenberg model realized with ultracold atoms.
29/04/21	Mathieu Barbier	Test talk
	Urs Gebert	Journal club: Short introduction to topological quantum computing.
22/04/21	Irakli Titvinidze	Status update
	Morad Ebrahimkkhas	Journal club: Mott insulating states with competing orders in the triangular lattice Hubbard model
15/04/21	Michael Pasek	Tutorial: "Introduction to the Git version control system"
	Irakli Titvinidze	"Falicov-Kimball model with Density dependent Peierls phase"