Birefringent Spin-Laser as a System of Coupled Harmonic Oscillators
Adding spin-polarized carriers to semiconductor lasers strongly changes their properties and, through the
transfer of angular momentum, leads to the emission of the circularly polarized light. In such spin-lasers the
polarization of the emitted light can be modulated an order of magnitude faster than its intensity in the best
conventional lasers1. This ultrafast operation in spin-lasers relies on the large linear birefringence, usually viewed
as detrimental in spin and conventional lasers, which couples the two linearly polarized emission modes. We
show that the dynamical properties of birefringent spin-lasers under intensity and polarization modulation are
accurately described as coupled harmonic oscillators2. Our model agrees with the intensity-equation description3
which, unlike the common complex field components describing the role of birefringence in laser dynamics, uses
simpler real quantities and allows analytical solutions. We further predict unexplored operation regimes and
elucidate the difference between the weak and strong coupling in spin-lasers2 and how they can build on the
recent breakthroughs in spin-light emitting diodes4
.
References:
1. M. Lindemann, G. Xu, T. Pusch, R. Michalzik, M. R. Hofmann, I. Žutić, Nature 568, 212 (2019).
2. V. Labinac, J. D. Cao, G. Xu, I. Žutić, Phys. Rev. B, under review.
3. G. Xu, J. D. Cao, V. Labinac, I. Žutić, Phys. Rev. B 103, 045306 (2021).
4. P. A. Dainone,…
Date and Time
Location
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Registration
- Date: 26 Jun 2025
- Time: 08:30 AM UTC to 09:32 AM UTC
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- Campus Artem,
- 2 allée André Guinier,
- Nancy , Lorraine
- France 54011
- Building: Institut Jean Lamour
- Room Number: Alnot 4-A014,
- Starts 01 June 2025 10:00 PM UTC
- Ends 25 June 2025 10:00 PM UTC
- No Admission Charge
Speakers
Igor Žutić
Biography:
Igor Žutić is a Professor of Physics at the University at Buffalo, the State University of
New York. He received PhD in theoretical physics at the University of Minnesota in
1998. His work spans topics from spin transport, superconductors, and Majorana
fermions, to magnetic semiconductors, proximity effects, and two-dimensional
materials. His predictions for spin devices not limited to magnetoresistance, such as
spin-photodiodes, transistors, and lasers, have been experimentally realized. Igor Žutić
is a fellow of the American Physical Society, a recipient of 2006 National Science
Foundation CAREER Award, and 2019 State University of New York Chancellor’s
Award for Excellence
Mohammed Balli
Biography:
Mohamed Balli is Full Professor at International University of Rabat (Morocco), Associate Professor at Sherbrooke University (Canada) & Adjunct Full professor at Mississippi State University (USA). He aims to understand how to particularly make functional materials useful in our daily life such as in clean and efficient refrigeration/heating, hydrogen storage, solar cells, batteries and much more. M. Balli received his master’s degree in Mechanics of Materials from Montpellier II University (2003, France), a second master’s degree in Magnetism from Joseph Fourier University, Grenoble 1 (2004, France) and, a PhD degree (2007) in physics of materials, from Joseph Fourier University, prepared at Néel Institute (CNRS). M. Balli has occupied several academic and research positions in France, Switzerland and Canada. His research work has received numerous awards including, "Rising star researcher award" given by the Research Fund: Nature and Technology, Canada (2014) and the “Research and Innovation Prize 2015” from Sherbrooke University. He is classified at the top 2% scientists in the world by Stanford University (2024).
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