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            <title xml:lang="en">Emergent states in dense systems of active rods: From swarming to turbulence</title>
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                <term xml:lang="en">Order parameter</term>
                <term xml:lang="en">Computer simulation</term>
                <term xml:lang="en">Dynamics</term>
                <term xml:lang="en">Suspensions (fluids)</term>
                <term xml:lang="en">Anisometric particles</term>
                <term xml:lang="en">Coherent motion</term>
                <term xml:lang="en">Colloidal rods</term>
                <term xml:lang="en">Aspect ratio</term>
                <term xml:lang="en">Variable shape</term>
                <term xml:lang="en">Slender particles</term>
                <term xml:lang="en">Rod-like particles</term>
                <term xml:lang="en">Correlation function</term>
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                <term xml:lang="en">Number fluctuations</term>
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                <term xml:lang="en">Minimal model</term>
                <term xml:lang="en">Many-body systems</term>
                <term xml:lang="en">Low density</term>
                <term xml:lang="en">Large aspect ratio</term>
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                <term xml:lang="en">High density</term>
                <term xml:lang="en">Dynamical state</term>
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              <p>Dense suspensions of self-propelled rod-like particles exhibit a fascinating variety of non-equilibrium phenomena. By means of computer simulations of a minimal model for rigid self-propelled colloidal rods with variable shape we explore the generic diagram of emerging states over a large range of rod densities and aspect ratios. The dynamics is studied using a simple numerical scheme for the overdamped noiseless frictional dynamics of a many-body system in which steric forces are dominant over hydrodynamic ones. The different emergent states are identified by various characteristic correlation functions and suitable order parameter fields. At low density and aspect ratio, a disordered phase with no coherent motion precedes a highly cooperative swarming state with giant number fluctuations at large aspect ratio. Conversely, at high densities weakly anisometric particles show a distinct jamming transition whereas slender particles form dynamic laning patterns. In between there is a large window corresponding to strongly vortical, turbulent flow. The different dynamical states should be verifiable in systems of swimming bacteria and artificial rod-like micro-swimmers.</p>
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