报告题目：Mapping as a probe for heating suppression in periodically driven quantum many-body systems
报告人：Dr. (Mr.) Etienne WAMBA
报告时间：2022.5.30 9：00
报告地点：zoom ：https://www.we-heraeus-stiftung.de/index.php?id=2230
邀请人：汪涛
报告摘要：
Space-time mappings are widely known as crucial tools for mapping solvable problems from complex forms into simpler ones. We introduced a non-traditional use of exact space-time mappings which consists in exactly mapping time evolutions of different quantum many-body systems, whether the actual problem can be solved or not. Our mappings are applicable to quantum gas experiments without [1] and with [2] dissipation. In this talk, I will discuss a mean-field model of many-body systems with rapid periodic driving. The driving is a certain periodic but anharmonic modulation of the gas's two-body interaction at a particular frequency, which makes it possible to map the Floquet experiment onto an evolution with slowly varying parameters. Such a mapping between a Floquet evolution and a slow process allows us to investigate non-equilibrium many-body dynamics and examine how rapidly driven systems may avoid heating up, at least when mean-field theory is still valid. We learn that rapid periodic driving may not yield to secular heating because the time evolution of the system has a kind of hidden adiabaticity, inasmuch as it can be mapped exactly onto that of an almost static system [3].
References
[1] Etienne Wamba, Axel Pelster, and James R. Anglin, Exact quantum field mappings between different experiments on quantum gases, Phys. Rev. A 94, 043628 (2016)
[2] Etienne Wamba and Axel Pelster, Exact N-point-function mapping between pairs of experiments with Markovian open quantum systems, Phys. Rev. A 102, 043320 (2020)
[3] Etienne Wamba, Axel Pelster, and James R. Anglin, Mapping as a probe for heating suppression in periodically driven quantum many-body systems, arxiv:2108.07171
报告人介绍：
Dr. (Mr.) Etienne WAMBA
Senior Lecturer, Faculty of Engineering and Technology, University of Buea
Fellow of the Wissenschaftskolleg zu Berlin (Temporary)
Citizenship: Cameroon
Email: wamba.etienne@gmail.com
EDUCATION
2013: Doctorate/PhD in Physics, University of Yaounde I
2006: DEA (Master of Science with Thesis) in Physics, University of Yaounde I
2005:DIPES 2 (Master of Education) in Physics, Higher Teachers Training College Yaounde
2004: Maîtrise (Master of Science) in Physics, University of Yaounde I
2002: Licence (Bachelor of Science) in Physics, University of Dschang
1998: Baccalauréat (G.C.E. A Level), Maths and Natural Sciences, Gov’t High school Penka-Michel
SCIENTIFIC PRODUCTION AND PROFESSIONAL EXPERIENCE
v Research field and interests
Current field: theoretical investigation of the dynamics of quantum many-body systems.
Particular interests:
- Atomic, molecular and optical physics
- Nonlinear dynamical systems
Focus on matter-wave solutions, instabilities, collective excitations, patterns formation, transport phenomenon, parallels of quantum gas theory with condensed matter physics, with nonlinear optics, with quantum optics, and with cosmology.
v Lecturing and Tutoring experience (at the University level)
# Lecturer (since 2019) at the University of Buea/ Cameroon
Courses taught: - Undergraduate: Classical Mechanics, Rigid-body mechanics, Linear Algebra, Analysis, and Numerical Methods
-Master: Numerical Analysis, Microwave Engineering
# Visiting Lecturer (since 2015) at the African Institute for Mathematical Sciences/ AIMS-Cameroon
Courses taught (Master): Concepts in Physics and Physics Problem solving, Quantum Mechanics
# Teaching Assistant: (2018) in the Department of Physics, Technical University of Kaiserslautern/ Germany.
Course tutored (Master): Quantum Field theory (with Prof. James Anglin)
# Resident Teaching Assistant (2013-2015) in Mathematical Sciences, AIMS-Cameroon.
Duty: Assist the lecturers and the Academic director, organize tutorials, interact on a continuous basis with students in individual and group study, and assist in the evaluation of students.
v Research stays
# Postdoctoral Researcher (2015 - 2019) at the Technical University Kaiserslautern, Germany
Host group: Foundations of Quantum Physics (Supervisors: Profs. Axel Pelster and James Anglin)
# Visiting researcher
- Wissenschaftskolleg zu Berlin, Germany: 2022
- Stellenbosch Institute for Advanced Studies (STIAS), South Africa: 2020
- Condensed Matter & Statistical Physics Section, ICTP, Italy: 2012, 2015, 2017, 2019, 2021
- Institute of Physics, Belgrade, Serbia: Nov 2016, Mar 2018, Jan 2019
- AIMS South Africa, Muizenberg, South Africa: June – Aug. 2013
- Physics Department, Pondicherry University, India: July – Sept. 2012
v Research awards received
1- WIKO’s fellow (Wissenschaftskolleg zu Berlin, Institute for Advanced Study), Germany, April-June 2022.
2- Iso Lomso Fellow (Stellenbosch Institute for Advanced Studies), South Africa, 2020-2022.
3- Fachbereich Physik Research Fellow (Technical University Kaiserslautern), Germany, December 2018 - May 2019. Scientific host: Priv.-Dr. Axel Pelster and Prof.-Dr. James R. Anglin.
4- Humboldt Postdoc Fellow (Technical University Kaiserslautern), Germany, October 2015 - May 2018. Scientific hosts: Priv.-Dr. Axel Pelster and Prof.-Dr. James R. Anglin.
5- Simons Associate of the Abdus Salam ICTP (Trieste), Italy, from 01 January 2015 to 31 December 2021. Scientific Coordinator: Prof. Rosario Fazio.
6- AIMS Visiting Fellow (African Institute for Mathematical Sciences, Cape Town), South Africa, from 29 June to 28 August 2013. Host: Prof. Barry Green.
7- CV Raman Visiting Fellow (Department of Physics, Pondicherry University), India, 11 July-15 September 2012, granted by DST - Government of India. Host scientist: Prof. K. Porsezian.
8- ICTP Short-term visiting fellow (Condensed Matter and Statistical Physics Section, Trieste), Italy, from 13 May to 13 June 2012. Host: Prof. Vladimir Kravtsov
v Scientific Dissertations
E. Wamba, “Matter waves of Bose-Einstein condensates with two- and three-body interactions”, PhD Thesis, University of Yaounde I (2013).
E. Wamba, “Out-of-equilibrium stochastic systems and critical behaviours: Case of the hearing organ”, M.Phil Thesis, University of Yaounde I (2006).
E. Wamba, “Dynamics and synchronisation of two wirelessly coupled electromechanical devices”, Thesis of Master of Education (DIPES II), Higher Teachers Training College Yaounde (2005).
