Spatiotemporal dynamics of coupled nonlinear oscillators on complex networks Zhonghuai Hou( 侯中怀 ) Beijing Department of Chemical Physics Hefei National Lab of Physical Science at Microscale University of Science and Technology of China

Our research interest  Statistical problems in mesoscopic chemical systems  Dynamics of coupled nonlinear oscillators on complex networks Complexity + Nonlinearity

Our research interest Statistical problems in mesoscopic chemical systems Nano-thermodynamics Nonlinear chemical dynamics Fluctuation theorems Effects of fluctuation

Effects of internal noise near HB  System Size Resonance ChemPhysChem 5, 407(2004); J.Chem.Phys. 119,11508(2003); J.Phys.Chem.A 109, 2745(2005); J.Phys.Chem.B 108,17796(2004); Chem.Phys.Lett. 401,307(2005);...

Effects of internal noise near HB  System Size Bi-Resonance ChemPhysChem 5, 1041(2004); 7, 1520(2006); J.Chem.Phys. 122, (2005); J.Phys.Chem.A 109, 8715(2005);

Effects of internal noise near HB  Two System Size Resonances N 个耦合的介观化学振荡体系 …… VVV V N Log(V) ChemPhysChem 5, 1602(2004); Phys.Rev.E 74, (2006) Optimal number of noisy oscillators of optimal size function the best

Dynamics of coupled nonlinear oscillators on complex networks Our research interest Spatiotemporal evolution Clustering Amplitude death Bifurcation and phase transition Other than synchroni- zation

Our research interest Dynamics of coupled nonlinear oscillators on complex networks Chaotic oscillator Relaxation oscillator Limit-cycle oscillator Chaotic map

Our research interest Dynamics of coupled nonlinear oscillators on complex networks Regular(K neighbors) Scale-Free... Global coupled Small-World(WS/WN) Key features of network topology

Today ’ s Contents SystemPhenomenon Chaotic oscillator Relaxation oscillator Limit-cycle oscillator Chaotic map Taming chaos Optimal coherence Oscillation death Pattern branching Driven oscillator Frequency selection

Taming Chaos Ordering Chaos by Random shortcuts F. Qi, Z.Hou, H.Xin. Phys.Rev.Lett. 91, (2003)

Taming Chaos Ordering Spatiotemporal Chaos in Complex Neuron Networks M. Wang, Z.Hou*, H.Xin. ChemPhysChem 7 ， 579( Mar 2006) ?

Pattern branching stable unstable

Pattern branching stable unstable

Optimal coherence ChemPhysChem, 6, 1042(2005); Chin.Phys.Lett. 23(10), 2666(2006)

Oscillation death K=4,p=0

Oscillation death Oscillator death on small-world networks Z.Hou, H.Xin, Phys.Rev.E 68,055103R(2003)

Frequency selective response Global Coupled Network G. Zhao, Z. Hou, H. Xin, Phys.Chem.Chem.Phys. 7,3634(2005)

Frequency selective response From regular to global Single: Fast; Global: Slow G. Zhao, Z. Hou, H. Xin, Chaos 16, (2006)

Concluding remarks Spatiotemporal chaos observed in a regular network can be tamed into ordered state via adding an optimal number of random shortcuts Coupled noisy relaxation oscillators show best coherence in time when an optimal number of random shortcuts are added to a regular network Network topology show a nontrivial effect on oscillation death, namely, partial death can be eliminated, and global death can be induced Larger network response more frequently to slow external signal than to the fast internal signal in coupled noisy FHN neuron models Fast transition from internal signal to external signal response happens within a narrow change of the number of random shortcuts

Thank you !

Frequency selective response G. Zhao, Z. Hou, H. Xin, Phys.Chem.Chem.Phys. 7,3634(2005) Single Isolated Oscillator