use warnings; use strict; use PDL; use PDL::Complex; my $eprim=0.001; my $X =pdl [ [ 0, -sqrt(1),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [sqrt(1),0, sqrt(2),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0, sqrt(2),0,sqrt(3),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,sqrt(3),0,sqrt(4),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,sqrt(4),0,sqrt(5),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,sqrt(5),0,sqrt(6),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,sqrt(6),0,sqrt(7),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,sqrt(7),0,sqrt(8),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,sqrt(8),0,sqrt(9),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,sqrt(9),0,sqrt(10),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,sqrt(10),0,sqrt(11),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,sqrt(11),0,sqrt(12),0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], 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0.0000000000469012,0.0000000000000001,0.0000000031569888,-0.0000000000000001,0.0000000829508766,0.0000000000000000,0.0000013139183774,-0.0000000000000001,0.0000144662736142,0.0000000000000001,0.0001187954144757,-0.0000000000000001,0.0007576595856397,0.0000000000000002,0.0038457059058298,-0.0000000000000001,0.0157544770583618,0.0000000000000002,0.0524034914224598,-0.0000000000000002,0.1412730634268711,0.0000000000000000,0.3051191205191895,-0.0000000000000000,0.5135323458897670,0.0000000000000002,0.6319248579965772,-0.0000000000000001,0.4699894042726668,-0.0000000000000000 ], [ -0.0000000000000000,0.0000000001872384,-0.0000000000000000,0.0000000073974097,-0.0000000000000000,0.0000001531161950,-0.0000000000000000,0.0000020854332860,-0.0000000000000000,0.0000206106783438,-0.0000000000000000,0.0001558996179038,-0.0000000000000000,0.0009318666076831,-0.0000000000000000,0.0044889011562547,-0.0000000000000000,0.0176207946824076,-0.0000000000000000,0.0565953635430333,-0.0000000000000000,0.1482728021860708,-0.0000000000000000,0.3129386149972143,-0.0000000000000000,0.5172629611893457,-0.0000000000000001,0.6280792712999990,-0.0000000000000001,0.4631473700646182 ] ]; #matrix T de los vectores del doblepozo my $vect= transpose($vec); #matrix con los vectores en la columna # my $V= $vec x $X x $vect; my $step=0.1; my $hbar=1; #print &Vnm(0,1); #print&Vnm(1,0); my @Em=(-3.49090786,-3.48609059,-0.94249804,-0.72223315,0.84486159,1.98334101,3.52168993,5.19562490,7.00900149,8.96758961,11.0614444444542760,13.1282317263938650,15.4597663541535190,18.2923955058715430,19.5751133106800170,21.3254642902799140,27.3060148356095880,33.6153274807702470,48.2864949409823790,58.1657460989797170,83.0782032408711330,97.3475523518670660,137.5307666823436800,157.3985331875067300,221.5161226004345300,248.6116702653141900,353.3740736965299900,390.0680354316574500,577.9792266930371600,628.4681868621187300); my $w=$Em[1]-$Em[0]; sub Vnm { my ($x1,$x2)=@_; return $V->range([$x1,$x2]); }; my $n; my $m; my $f; my @c = (1, 0, 0, 0); #INITIAL CONDITIONS #@c=F=(F0,F1,F2,F3) sub F0 { my ($t,@c)=@_; $m=0; $f=0; for ($n=0;$n<4;$n++){ my $a= &Vnm($n,$m)*exp(-(i)*($Em[$m]-$Em[$n])*($t/$hbar)); if ($n!=$m){ $f = $f + $a*(-(i)*(-$eprim)*cos($w*$t)*$c[$n]); }; }; return $f; }; sub F1 { my ($t,@c)=@_; $m=1; $f=0; for ($n=0;$n<4;$n++){ my $a= &Vnm($n,$m)*exp(-(i)*($Em[$m]-$Em[$n])*($t/$hbar)); if ($n!=$m){ $f = $f + $a*(-(i)*(-$eprim)*cos($w*$t)*$c[$n]); }; }; return $f; }; sub F2 { my ($t,@c)=@_; $m=2; $f=0; for ($n=0;$n<4;$n++){ my $a= &Vnm($n,$m)*exp(-(i)*($Em[$m]-$Em[$n])*($t/$hbar)); if ($n!=$m){ $f = $f + $a*-(i)*(-$eprim)*cos($w*$t)*$c[$n]; }; }; return $f; }; sub F3 { my ($t,@c)=@_; $m=3; $f=0; for ($n=0;$n<4;$n++){ my $a= &Vnm($n,$m)*exp(-(i)*($Em[$m]-$Em[$n])*($t/$hbar)); for ($n!=$m){ $f = $f +$a*(-(i)*(-$eprim)*cos($w*$t)*$c[$n]); }; }; return $f; }; #Método RK4 my $k1; my $k2; my $k3; my $k4; my $k1_1; my $k2_1; my $k3_1; my $k4_1; my $k1_2; my $k2_2; my $k3_2; my $k4_2; my $k1_3; my $k2_3; my $k3_3; my $k4_3; sub RK4_c0 { my ($t,@c)=@_; sub k1 { my ($t1,@c)=@_;return $step*&F0($t1,@c); }; sub k2 { my ($t2,@c)=@_;return $step*&F0(($t2+$step/2),( @c + (&k1($t2)/2)));}; sub k3 { my ($t3,@c)=@_;return $step*&F0(($t3+$step/2),( @c + (&k2($t3)/2))) ;}; sub k4 { my ($t4,@c)=@_;return $step*&F0(($t4+$step),( @c + &k3($t4)));}; return $c[0] + (1/6)*(&k1($t,@c)+ 2*(&k2($t,@c) + &k3($t,@c)) + &k4($t,@c)); }; sub RK4_c1 { my ($t,@c)=@_; sub k1_1 { my ($t1,@c)=@_;return $step*&F1($t1,@c); }; sub k2_1 { my ($t2,@c)=@_;return $step*&F1(($t2+$step/2),( @c + &k1($t2/2)));}; sub k3_1 { my ($t3,@c)=@_;return $step*&F1(($t3+$step/2),( @c + &k2($t3)/2)) ;}; sub k4_1 { my ($t4,@c)=@_;return $step*&F1(($t4+$step),( @c + &k3($t4)));}; return $c[1] + (1/6)*(&k1_1($t,@c)+ 2*(&k2_1($t,@c) + &k3_1($t,@c)) + &k4_1($t,@c)); }; sub RK4_c2 { my ($t,@c)=@_; sub k1_2 { my ($t1,@c)=@_;return $step*&F2($t1,@c); }; sub k2_2 { my ($t2,@c)=@_;return $step*&F2(($t2+$step/2),( @c + &k1($t2)/2));}; sub k3_2 { my ($t3,@c)=@_;return $step*&F2(($t3+$step/2),( @c + &k2($t3)/2)) ;}; sub k4_2 { my ($t4,@c)=@_;return $step*&F2(($t4+$step),( @c + &k3($t4)));}; return $c[2] + (1/6)*(&k1_2($t,@c)+ 2*(&k2_2($t,@c) + &k3_2($t,@c)) + &k4_2($t,@c)); }; sub RK4_c3 { my ($t,@c)=@_; sub k1_3 { my ($t1,@c)=@_;return $step*&F3($t1,@c); }; sub k2_3 { my ($t2,@c)=@_;return $step*&F3(($t2+$step/2),( @c + &k1($t2)/2));}; sub k3_3 { my ($t3,@c)=@_;return $step*&F3(($t3+$step/2),( @c + &k2($t3)/2)) ;}; sub k4_3 { my ($t4,@c)=@_;return $step*&F3(($t4+$step),( @c + &k3($t4)));}; return $c[3] + (1/6)*(&k1_3($t,@c)+ 2*(&k2_3($t,@c) + &k3_3($t,@c)) + &k4_3($t,@c)); }; my $t=0; open (FILE , ">C0_V1W01p2.dat"); for ($t=0; $t<2500;$t+=$step){ #print " @c $t \n"; #print abs($c[0])*abs($c[0]), "\n"; $c[0]= &RK4_c0($t,@c); $c[1]= &RK4_c1($t,@c); $c[2]= &RK4_c2($t,@c); $c[3]= &RK4_c3($t,@c); my $x= abs($c[0])**2; my $b= abs($c[1])**2; my $s= abs($c[2])**2; my $d= abs($c[3])**2; print FILE "$x $b $s $d $t\n"; }; close (FILE);