# Monte Carlo Simulation technique. S. B. Santra Department of Physics Indian Institute of Technology Guwahati

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1 Monte Carlo Simulation technique S. B. Santra Department of Physics Indian Institute of Technology Guwahati

2 What is Monte Carlo (MC)? Introduction Monte Carlo method is a common name for a wide variety of stochastic techniques. These techniques are based on the use of random numbers (sampling) and probability statistics to investigate problems in areas as diverse as economics, Material Science, Statistical Physics, Chemical and Bio Physics, nuclear physics, flow of traffic and many others. In general, to call something a "Monte Carlo" method, all you need to do is use random numbers to examine your problem. Why MC? Difficult to solve analytically, may have too many particles in the system, may have complex interactions among the particles and or with the external field.

3 A simple example of MC Can we determine the value of π using a Monte Carlo method? Draw a square on the ground, then inscribe a circle within it. Uniformly scatter some objects of uniform size (grains of rice or sand) over the square. Count the number of objects inside the circle and the total number of objects. The ratio of the two counts is an estimate of the ratio of the two areas, which is π/4. Multiply the result by 4 to estimate π.

4 What have we done? 1. Defined a domain of possible inputs. 2. Generated inputs randomly from a probability distribution over the domain. 3. Performed a deterministic computation on the inputs. 4. Aggregate the results. Domain of inputs is the square that circumscribes the circle. Common properties of Monte Carlo methods: The inputs should truly be random. If grains are purposefully dropped into only the center of the circle, they will not be uniformly distributed, and so our approximation will be poor. There should be a large number of inputs. The approximation will generally be poor if only a few grains are randomly dropped into the whole square. On average, the approximation improves as more grains are dropped.

5 Evaluation of definite Integral by MC Very effective in evaluating higher dimensional integrations. Error is less in MC

6 How to make things random? You need to have Random Number Generator. RNG provides uniformly distributed numbers between 0 and 1. How to generate? Congruential method: a simple and popular algorithm provides numbers between 1 and N max. In 32-bit linear congruential algorithm, a 0 is zero, X 0 is taken as an odd number, c=16807, Nmax=2 31-1=

7 Different types of MC Classical Monte Carlo: samples are drawn from a probability distribution, often the classical Boltzmann distribution, to obtain thermodynamic properties or minimumenergy structures; Quantum Monte Carlo: random walks are used to compute quantum-mechanical energies and wave functions, often to solve electronic structure problems, using Schrödinger's equation as a formal starting point;

8 Macroscopic system: Classical MC Consider a macroscopic system described by a Hamiltonian H in thermodynamic equilibrium with a heat bath at temperature T. = 1 The expectation value of a physical quantity A is given by If the system is described by discrete energy states One needs to calculate Z, the partition function, which gives an exact description of the system. Evaluation of an infinite series or an integration over a 6N dimensional space. In most of the cases, it is not possible to evaluate Z exactly. Difficulty is not only in evaluating the integral/infinite series but also handling the complex interaction appearing in the exponential.

9 Monte Carlo sampling In general, it is not possible to evaluate the summation over such a large number of state or the integral in such a high dimensional space. It is always possible to take average over a finite number of states, a subset of all possible states, if one knows the correct Boltzmann weight of the states and the probability with which they have to be picked up. Say, a small subset of all possible states are chosen at random with certain probability distribution p s. So the best estimate of a physical quantity A will be For a two state system: = 2, 2 10 Usually, in a MC simulation N is taken as 10 6 to 10 8.

10 Simple sampling Monte Carlo The problem is how to specify p s so that the chosen N states will lead to right <A>? A simple choice of p s =p for all state will lead the estimator Such average is generally suitable for non-thermal, non-interacting systems. For these systems, T is taken constant but high.

11 Example-1: Random walk - Diffusion = For square lattice, = 4. For = 400, No. of configurations 10 = + = 1 2 ~ = 1 2

12 Example-2: Self-avoiding walk- Linear polymers in dilute solution For = 2, = = 3 4

13 Percolation disordered systems Composite material 1 I (0,0) C* C 1 Composite material= mixture of metal and non-metal, C is the concentration of conducting elements, I is the current flowing in the circuit. C<C* Non-conducting C=C* Just conducting/ Percolation C>C* Always conducting*

14 Other Examples Dilute magnet: Paramagnet disordered by non-magnetic ions. Concentration of magnetic ions is, say p. p<p c Non-magnetic p>p c Magnetic Polymer gelation: Concentration of monomers is p. p<p c Solution p>p c Gel Flow of liquid in porous media Spread of a disease in a population Stochastic star formation in spiral galaxies Quarks in nuclear matter Local /extended wetting Containment/epidemic Non-propagation/propagation Confinement/non-confinement

15 Percolation model p=0.4 p=0.6 p=0.8

16 Percolation clusters at different occupation probability p = 0.55 p = 0.58 p = p = 0.65

17 Moments of cluster size distribution and Connectivity length: ~ ~ Signature of a second order phase transition

18 Importance sampling MC: The statistical average of a quantity A is given by: Sum is over all possible states. At high temperature, the Boltzmann probability goes to 1 and it leads to simple average. However, in the low temperature limit, the system spends almost all its time sitting in the ground state or one of the lowest excited states. An extremely restricted part of the phase space should contribute to the average and the sum should be over the few low energy states. Picking up points randomly over the whole phase space is no good here.

19 Importance Sampling It is a method that will lead us automatically in the important region of phase space. How one could sample points preferentially from the region which is populated by the appropriate states? Such a method is realizable via the importance sampling MC scheme. In such a scheme, a state s is picked up with a probability p s proportional to the Boltzmann factor. A MC estimator then can be defined for a subset of N microstates (much smaller than all possible states) as Note that p s =p leads to simple sampling

20 Importance Sampling Instead of picking N states randomly, pick them with a probability p s, the correct Boltzmann weight. This averaging is called importance sampling average. Hoverer, it is not a easy task to pick up states which appear with its correct Boltzmann weight.

21 Markov chain It is possible to realize importance sampling with the help of Markov chain. A Markov chain is a sequence of states each of which depends only on the preceding one. The transition probability W nm from state n to m should not vary over time and depends only on the properties of current states (n,m). The Markov chain has the property that average over a successive configurations if the states are weighted by Boltzmann factor.

22 Master equation: At time t:.. ( ) State n State m ( ) = + ( )

23 Ergodicity It should be possible in Markov process to reach any state of the system starting from any other state in long run. This is necessary to achieve a state with its correct Boltzmann weight. Since each state m appears with some non-zero probability p m in the Boltzmann distribution, and if that state is inaccessible from another state n, then the probability to find the state m starting from state n is zero. This is in contradiction with Boltzmann distribution which demands the state should appear with a probability p m. This means that there must be at least one path of non-zero transition probabilities between any two states. One should take care in implementing MC algorithms that it should not violate ergodicity.

24 Detailed balance In the steady state, the probability flux out of a state n is equal to the probability flux into the state n and the steady state condition is given by the global balance equation However, the above condition is not sufficient to guarantee that the probability distribution will tend to p n after a long evolution of a Markov chain starting from any state. Detailed balance:

25 Metropolis algorithm = 1 and = 1 where = Since the canonical partition function Z is extremely difficult to calculate exactly, or is not known exactly. = = where = Algorithm: = > Using this transition probability one cane now generate a series of states with their right Boltzmann weight.

26 How to implement? = for > 0? Call a random number = 0,1 uniformly distributed between 0 and 1. If, change the state otherwise do not change the state. n m P nm E nm E nm

27 Application to Ising Model: Set B=0. The critical temperature: Applications: Para to ferromagnetic transition Liquid gas transition Binary alloys Scaling: = ~ Critical exponents: = 15

28 Metropolis algorithm for spin-1/2 Ising model 1. Choice of initial state: Take a (L L) square lattice. A random spin configuration is taken as initial state assigning s = +1 (or 1) to the lattice sites randomly with probability 0.5 corresponding to up spin (or down spin) respectively. 2. Calculation of energy change: Choose a site j randomly from the sites with s = +1 or 1 which correspond to the initial state of the jth spin. The final state is the state with the overturned spin at the jth site. The change in energy = for the sing Hamiltonian without external field is given by where sj is the initial spin state and s k s are the nearest neighbour spins. 3. Accept or reject the spin flip: If E < 0 flip the spin, else call a random number r uniformly distributed between 0 and 1. If flip the spin, otherwise do not flip it. 4. Iteration: Go to the next site and start from (2). Repeat the process for all spins.

29 Calculation of change in energy: =

30 Spin configuration:

31 Spin configuration:

32 Equilibrium:

33 Equilibrium configurations

34 Magnetization and Susceptibility: The magnetization m per spin in a state n is given by = Since only one spin (k) flips at a time in the Metropolis algorithm, so the change in magnetization is given by = = = = 2 = One can then calculate the magnetization at the beginning of the simulation and then use the following equation = + = + 2 = One could calculate the per spin susceptibility as 1 = 1

35 Magnetization and Susceptibility: On a 2d square lattice of size

36 Energy and specific heat: = Set J=1 The energy difference in going from state n to state m is: One may calculate the per spin specific heat as

37 Energy and specific heat:

38 Time auto correlation In order to take average of a physical quantity, we have presumed that the states over which the average has been made are independent. Thus to make sure that the states are independent, one needs to measure the correlation time τ of the simulation. The time auto correlation C m (t) of magnetization is defined as The auto correlation C m (t) is expected to fall off exponentially at long time Thus, at t = τ, C m (t) drops by a factor of 1/e from the maximum value at t = 0. For independent samples, one should draw them at an interval greater than τ. In most of the definitions of statistical independence, the interval turns out to be 2τ.

39 Time auto correlation C m (t) Critical slowing down

40 Cluster update algorithms Cluster update algorithms are the most successful global update methods in use. These methods update the variables globally, in one step, whereas the standard local methods operate on one variable at a time A global update can reduce the autocorrelation time of the update and thus greatly reduce the statistical errors. Two famous algorithms: Swendsen-Wang and Wolff

41 Swendsen-Wang algorithm: PRL 58 (1987) 86. Beginning with an arbitrary configuration s i, one SW cluster update cycle is:

42 Wolff single cluster algorithm: PRL 62 (1989) 361 Principle: do the cluster decomposition as in S-W, but invert ( flip ) only one randomly chosen cluster! In practice:

43 Auto correlation in cluster algorithm

44 Effect of finite size Critical temperature: Thermodynamic quantities: At = :

45 Wang-Landau Instead of configuration sum, one may sum over the energy levels with right g(e). Again it is difficult to calculate value of g(e) for large systems. In conventional MC, one directly generate the canonical distribution: In WL, g(e) is estimated directly and accurately by performing a random in energy space. Change the states with a probability that depends on the density of states as given below:

46 Kinetic Monte Carlo With MD we can only reproduce the dynamics of the system for 100 ns. Slow thermally activated processes, such as diffusion, cannot be modeled. Metropolis Monte Carlo samples configurational space and generates configurations according to the desired statistical-mechanics distribution. However, there is no time in Metropolis MC and the method cannot be used to study evolution of the system or kinetics. An alternative computational technique that can be used to study kinetics of slow processes is the kinetic Monte Carlo (kmc) method. As compared to the Metropolis Monte Carlo method, kinetic Monte Carlo method has a different scheme for the generation of the next state. The main idea behind kmc is to use transition rates that depend on the energy barrier between the states, with time increments formulated so that they relate In Metropolis MC methods we decide whether to accept a move by considering the energy difference between the states. In kmc methods we use rates that depend on the energy barrier between the states.

47 Hybrid Monte Carlo A hybrid Monte Carlo move involves running a molecular dynamics simulation for a fixed length of time. The configuration at the end of this molecular dynamics run is accepted or rejected based on the Metropolis criterion, where E(n) is the potential energy before the molecular dynamics run, and E(m) is the potential energy at the end of the run. Thus, molecular dynamics can be used to propose a Monte Carlo move that involves the collective motion of many particles. An advantage that this method has over conventional molecular dynamics simulations is that large time steps may be used in the hybrid Monte Carlo move. State n MD State m E n E m

48 Thank you

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