Dr Tristram Alexander

A28 - Physics Building
The University of Sydney

Telephone +61 2 9351 5897
Fax +61 2 9351 7726

Biographical details

Dr Tristram Alexander is a Senior Lecturer in the School of Physics. He is trained as a theoretical physicist, completing his PhD under Professor Yuri Kivshar at the Nonlinear Physics Centre (ANU) in the area of nonlinear wave dynamics in Bose-Einstein condensations. He continues to work in the field of nonlinear waves, but has broadened his interests to a wide range of nonlinear phenomena, from heat flow to social dynamics.

Research interests

Dr Alexander's research focuses on modelling and predicting new behaviour in complex systems. His research falls into three categories:

  1. Nonlinear wave dynamics in optics and Bose-Einstein condensates, including the theory of solitons and non-equilibrium wave dynamics;
  2. Heat flow and control and associated problems in nonlinear dynamics;
  3. Social dynamics modelling, involving data science techniques for managing and analyzing social data, and computational modelling of social systems.

Computational techniques are an essential part of his research, and include the simulation and analysis of nonlinear partial differential equations, the simulation of agent-based models, and machine learning techniques to extract information from data. His research is intrinsically interdisciplinary and he collaborates with researchers from a wide range of backgrounds across the University.

Teaching and supervision

  • Course coordinator and lecturer for COSC2002/COSC2902 “Computational Modelling”
  • Lecturer for PHYS3035 “Electrodynamics (Mainstream)”
  • Lecturer for Thermal Physics module in PHYS1001
  • Co-developer of the OLE “How to Estimate Anything”

Current projects

  • Theory of dark solitons in the presence of quartic dispersion
  • Moving solitons in the presence of higher-order dispersion
  • Development of a defect-based thermal diode
  • Modelling atmospheric water capture
  • Hashtag dynamics on social media
  • Classification of political orientation of social media users
  • Emergence of extremism in politically polarised interactions
  • Modelling gun control scenarios
  • Using machine learning to understand laughter dynamics

Selected publications

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Journals

  • Pinsker, F., Ruan, X., Alexander, T. (2017). Effects of the non-parabolic kinetic energy on non-equilibrium polariton condensates. Scientific Reports, 7(1), 1-11. [More Information]
  • Alexander, T., Xu, Y., Sidhu, H. (2016). Horizontally shaken impact pendulums. Journal of Sound and Vibration, 366, 471-483. [More Information]
  • Palmero, F., Han, J., English, L., Alexander, T., Kevrekidis, P. (2016). Multifrequency and edge breathers in the discrete sine-Gordon system via subharmonic driving: Theory, computation and experiment. Physics Letters. Section A: General, Atomic and Solid State Physics, 380(3), 402-407. [More Information]
  • Alexander, T. (2016). Spontaneous rotation in a driven mechanical system. Journal of Sound and Vibration, 371, 295-304. [More Information]
  • Pinsker, F., Alexander, T. (2015). Nonlinear eigenmodes of a non-equilibrium harmonic oscillator. Proceedings of the Royal Society A, 471(2180), 1-12. [More Information]
  • Xu, Y., Alexander, T., Sidhu, H., Kevrekidis, P. (2014). Instability dynamics and breather formation in a horizontally shaken pendulum chain. Physical Review E, 90(4). [More Information]
  • Alexander, T., Yan, D., Kevrekidis, P. (2013). Complex mode dynamics of coupled wave oscillators. Physical Review E, 88(6), 062908-1-062908-6. [More Information]
  • Alexander, T., Heenan, K., Salerno, M., Ostrovskaya, E. (2012). Dynamics of matter-wave solitons in harmonic traps with flashing optical lattices. Physical Review A, 85(6), 063626-1-063626-8. [More Information]
  • Xu, Y., Alexander, T., Sidhu, H. (2011). Instability dynamics of a horizontally shaken pendulum. ANZIAM Journal, 53(SUPPL), C325-C339.
  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Observation of nonlinear self-trapping of broad beams in defocusing waveguide arrays. Physical Review Letters, 106(9), 093901-1-093901-4. [More Information]
  • Alexander, T. (2011). Self-guiding of matter waves in optical lattices. Physical Review A, 83(4). [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Low Temperature Physics, 36(8), 700-706. [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Low Temperature Physics, 36(8), 700-706. [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Fizika Nizkikh Temperatur, 36, 883-890.
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2009). Excited spin states and phase separation in spinor Bose-Einstein condensates. Physical Review A, 80(2). [More Information]
  • Wang, J., Wang, J., Alexander, T., Kivshar, Y. (2009). Truncated-Bloch-wave solitons in optical lattices. Physical Review A, 79(4). [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2008). Spin-domain formation in antiferromagnetic condensates. Physical Review A, 78(2). [More Information]
  • Alexander, T., Desyatnikov, A., Kivshar, Y. (2007). Multivortex solitons in triangular photonic lattices. Optics Letters, 32(10), 1293-1295. [More Information]
  • Ostrovskaya, E., Alexander, T., Kivshar, Y. (2006). Generation and detection of matter-wave gap vortices in optical lattices. Physical Review A, 74(2). [More Information]
  • Lee, C., Alexander, T., Kivshar, Y. (2006). Melting of discrete vortices via quantum fluctuations. Physical Review Letters, 97(18). [More Information]
  • Alexander, T., Ostrovskaya, E., Kivshar, Y. (2006). Self-trapped nonlinear matter waves in periodic potentials. Physical Review Letters, 96(4). [More Information]
  • Alexander, T., Kivshar, Y. (2006). Soliton complexes and flat-top nonlinear modes in optical lattices. Applied Physics B: Lasers and Optics, 82(2 SPEC. ISS.), 203-206. [More Information]
  • Alexander, T., Ostrovskaya, E., Sukhorukov, A., Kivshar, Y. (2005). Three-dimensional matter-wave vortices in optical lattices. Physical Review A, 72(4). [More Information]
  • Alexander, T., Sukhorukov, A., Kivshar, Y. (2004). Asymmetric vortex solitons in nonlinear periodic lattices. Physical Review Letters, 93(6), 63901-1-063901-4. [More Information]
  • Neshev, D., Alexander, T., Ostrovskaya, E., Kivshar, Y., Martin, H., Makasyuk, I., Chen, Z. (2004). Observation of discrete vortex solitons in optically induced photonic lattices. Physical Review Letters, 92(12), 123903-1-123903-4. [More Information]
  • Cusack, B., Alexander, T., Ostrovskaya, E., Kivshar, Y. (2002). Existence and stability of coupled atomic-molecular Bose-Einstein condensates. Physical Review A, 65(1), 4. [More Information]
  • Alexander, T., Berge, L. (2002). Ground states and vortices of matter-wave condensates and optical guided waves. Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 65(2). [More Information]
  • Alexander, T., Ostrovskaya, E., Kivshar, Y., Julienne, P. (2002). Vortices in atomic-molecular Bose-Einstein condensates. Journal of Optics B: Quantum and Semiclassical Optics, 4(2), S33-S38. [More Information]
  • Sukhorukov, A., Alexander, T., Kivshar, Y., Saltiel, S. (2001). Multistep cascading and fourth-harmonic generation. Physics Letters. Section A: General, Atomic and Solid State Physics, 281(1), 34-38. [More Information]
  • Kivshar, Y., Alexander, T., Turitsyn, S. (2001). Nonlinear modes of a macroscopic quantum oscillator. Physics Letters. Section A: General, Atomic and Solid State Physics, 278(4), 225-230. [More Information]
  • Berge, L., Alexander, T., Kivshar, Y. (2000). Stability criterion for attractive Bose-Einstein condensates. Physical Review A, 62(2), 23607-23601.
  • Berge, L., Alexander, T., Kivshar, Y. (2000). Stability criterion for attractive Bose-Einstein condensates. Physical Review A, 62(2), 6. [More Information]
  • Kivshar, Y., Alexander, T., Saltiel, S. (1999). Spatial optical solitons resulting from multistep cascading. Optics Letters, 24(11), 759-761. [More Information]
  • Alexander, T., Buryak, A., Kivshar, Y. (1998). Stabilization of dark and vortex parametric spatial solitons. Optics Letters, 23(9), 670-672. [More Information]

Conferences

  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Nonlinear self-trapping of broad beams in defocusing lithium niobate waveguide arrays. 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011, United States.
  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Self-trapping of broad beams in defocusing nonlinear Lithium Niobate waveguide arrays. 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, Germany: Institute of Electrical and Electronics Engineers (IEEE). [More Information]

2017

  • Pinsker, F., Ruan, X., Alexander, T. (2017). Effects of the non-parabolic kinetic energy on non-equilibrium polariton condensates. Scientific Reports, 7(1), 1-11. [More Information]

2016

  • Alexander, T., Xu, Y., Sidhu, H. (2016). Horizontally shaken impact pendulums. Journal of Sound and Vibration, 366, 471-483. [More Information]
  • Palmero, F., Han, J., English, L., Alexander, T., Kevrekidis, P. (2016). Multifrequency and edge breathers in the discrete sine-Gordon system via subharmonic driving: Theory, computation and experiment. Physics Letters. Section A: General, Atomic and Solid State Physics, 380(3), 402-407. [More Information]
  • Alexander, T. (2016). Spontaneous rotation in a driven mechanical system. Journal of Sound and Vibration, 371, 295-304. [More Information]

2015

  • Pinsker, F., Alexander, T. (2015). Nonlinear eigenmodes of a non-equilibrium harmonic oscillator. Proceedings of the Royal Society A, 471(2180), 1-12. [More Information]

2014

  • Xu, Y., Alexander, T., Sidhu, H., Kevrekidis, P. (2014). Instability dynamics and breather formation in a horizontally shaken pendulum chain. Physical Review E, 90(4). [More Information]

2013

  • Alexander, T., Yan, D., Kevrekidis, P. (2013). Complex mode dynamics of coupled wave oscillators. Physical Review E, 88(6), 062908-1-062908-6. [More Information]

2012

  • Alexander, T., Heenan, K., Salerno, M., Ostrovskaya, E. (2012). Dynamics of matter-wave solitons in harmonic traps with flashing optical lattices. Physical Review A, 85(6), 063626-1-063626-8. [More Information]

2011

  • Xu, Y., Alexander, T., Sidhu, H. (2011). Instability dynamics of a horizontally shaken pendulum. ANZIAM Journal, 53(SUPPL), C325-C339.
  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Nonlinear self-trapping of broad beams in defocusing lithium niobate waveguide arrays. 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011, United States.
  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Observation of nonlinear self-trapping of broad beams in defocusing waveguide arrays. Physical Review Letters, 106(9), 093901-1-093901-4. [More Information]
  • Alexander, T. (2011). Self-guiding of matter waves in optical lattices. Physical Review A, 83(4). [More Information]
  • Bennet, F., Alexander, T., Haslinger, F., Mitchell, A., Neshev, D., Kivshar, Y. (2011). Self-trapping of broad beams in defocusing nonlinear Lithium Niobate waveguide arrays. 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, Germany: Institute of Electrical and Electronics Engineers (IEEE). [More Information]

2010

  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Low Temperature Physics, 36(8), 700-706. [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Low Temperature Physics, 36(8), 700-706. [More Information]
  • Matuszewski, M., Alexander, T., Kivshar, Y. (2010). Magnetic domains in spinor Bose-Einstein condensates. Fizika Nizkikh Temperatur, 36, 883-890.

2009

  • Matuszewski, M., Alexander, T., Kivshar, Y. (2009). Excited spin states and phase separation in spinor Bose-Einstein condensates. Physical Review A, 80(2). [More Information]
  • Wang, J., Wang, J., Alexander, T., Kivshar, Y. (2009). Truncated-Bloch-wave solitons in optical lattices. Physical Review A, 79(4). [More Information]

2008

  • Matuszewski, M., Alexander, T., Kivshar, Y. (2008). Spin-domain formation in antiferromagnetic condensates. Physical Review A, 78(2). [More Information]

2007

  • Alexander, T., Desyatnikov, A., Kivshar, Y. (2007). Multivortex solitons in triangular photonic lattices. Optics Letters, 32(10), 1293-1295. [More Information]

2006

  • Ostrovskaya, E., Alexander, T., Kivshar, Y. (2006). Generation and detection of matter-wave gap vortices in optical lattices. Physical Review A, 74(2). [More Information]
  • Lee, C., Alexander, T., Kivshar, Y. (2006). Melting of discrete vortices via quantum fluctuations. Physical Review Letters, 97(18). [More Information]
  • Alexander, T., Ostrovskaya, E., Kivshar, Y. (2006). Self-trapped nonlinear matter waves in periodic potentials. Physical Review Letters, 96(4). [More Information]
  • Alexander, T., Kivshar, Y. (2006). Soliton complexes and flat-top nonlinear modes in optical lattices. Applied Physics B: Lasers and Optics, 82(2 SPEC. ISS.), 203-206. [More Information]

2005

  • Alexander, T., Ostrovskaya, E., Sukhorukov, A., Kivshar, Y. (2005). Three-dimensional matter-wave vortices in optical lattices. Physical Review A, 72(4). [More Information]

2004

  • Alexander, T., Sukhorukov, A., Kivshar, Y. (2004). Asymmetric vortex solitons in nonlinear periodic lattices. Physical Review Letters, 93(6), 63901-1-063901-4. [More Information]
  • Neshev, D., Alexander, T., Ostrovskaya, E., Kivshar, Y., Martin, H., Makasyuk, I., Chen, Z. (2004). Observation of discrete vortex solitons in optically induced photonic lattices. Physical Review Letters, 92(12), 123903-1-123903-4. [More Information]

2002

  • Cusack, B., Alexander, T., Ostrovskaya, E., Kivshar, Y. (2002). Existence and stability of coupled atomic-molecular Bose-Einstein condensates. Physical Review A, 65(1), 4. [More Information]
  • Alexander, T., Berge, L. (2002). Ground states and vortices of matter-wave condensates and optical guided waves. Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 65(2). [More Information]
  • Alexander, T., Ostrovskaya, E., Kivshar, Y., Julienne, P. (2002). Vortices in atomic-molecular Bose-Einstein condensates. Journal of Optics B: Quantum and Semiclassical Optics, 4(2), S33-S38. [More Information]

2001

  • Sukhorukov, A., Alexander, T., Kivshar, Y., Saltiel, S. (2001). Multistep cascading and fourth-harmonic generation. Physics Letters. Section A: General, Atomic and Solid State Physics, 281(1), 34-38. [More Information]
  • Kivshar, Y., Alexander, T., Turitsyn, S. (2001). Nonlinear modes of a macroscopic quantum oscillator. Physics Letters. Section A: General, Atomic and Solid State Physics, 278(4), 225-230. [More Information]

2000

  • Berge, L., Alexander, T., Kivshar, Y. (2000). Stability criterion for attractive Bose-Einstein condensates. Physical Review A, 62(2), 23607-23601.
  • Berge, L., Alexander, T., Kivshar, Y. (2000). Stability criterion for attractive Bose-Einstein condensates. Physical Review A, 62(2), 6. [More Information]

1999

  • Kivshar, Y., Alexander, T., Saltiel, S. (1999). Spatial optical solitons resulting from multistep cascading. Optics Letters, 24(11), 759-761. [More Information]

1998

  • Alexander, T., Buryak, A., Kivshar, Y. (1998). Stabilization of dark and vortex parametric spatial solitons. Optics Letters, 23(9), 670-672. [More Information]

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