Haldane Model笔记

六角蜂窝晶格

晶格规范与原子规范

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FIG.1: 色散关系，晶格规范(a)，原子规范(b)。Berry曲率，晶格规范(c)，原子规范(d)。[CODE]

边界态，Winding loops与二维系统Winding Number

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FIG.2: 理论模型，能带结构，winding loop以及winding number。分别对应Zigzag边界(a)(e)(i)(m)，Bearded边界(b)(f)(j)(n)，Armchair边界(c)(g)(k)(o)和twig边界(d)(h)(l)(p)。

Haldane Model

模型

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FIG.3: 色散关系及贝利曲率（对应陈数1，-1）。

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FIG.4: 能带结构。

相变与能带结构

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能带结构之前的图改下参数即可，画了没保存，相变交接不仅陈数会变为0，贝利曲率的正负也会出现突变。

手性边界态

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Modified Haldane Model

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FIG.5: 色散关系及能带结构。

核心代码

FIG.1

色散关系（晶格规范）

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clc
clear all

%% 参数
e_0=1;
a=sqrt(3)*e_0;
r1=a*[1,0]';
r2=a*[1/2,-sqrt(3)/2]';
t=1;

%% 循环次数
count_x=500;
count_y=500;

%% k_x,k_y 取值
k_xx=4*linspace(-1*pi,1*pi,count_x)/a;
k_yy=4*linspace(-1*pi,1*pi,count_y)/a;

%% 颜色
colorrd=[207,108,82]/255;
coloryl=[241,141,0]/255;
colorbl=[109,152,165]/255;

%% 计算
bar = waitbar(0,'色散关系计算中...'); %显示进度条
for x = 1:count_x
    per=x/count_x;
    str=['色散关系计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1:count_y
        k_x=k_xx(x);
        k_y=k_yy(y);
        k=[k_x k_y];
        % Hamiltonian
        H=zeros(2);
        H(1,2)=t+t*exp(-1i*k*r1)+t*exp(-1i*k*r2);
        H(2,1)=conj(H(1,2));
        E(x,y,:)=eig(H);
    end
end

%% 绘图
% 设置图窗
f1=figure(1);
position0=get(f1,'position');
set(f1,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

%结果
nexttile
pcolor(k_xx/(pi/a),k_yy/(pi/a),E(:,:,1)')
hold on
pcolor(k_xx/(pi/a),k_yy/(pi/a),E(:,:,2)')
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
clim([0,max(max(max(E)))])
load('colorData.mat');
axis([min(k_xx/(pi/a)),max(k_xx/(pi/a)),min(k_yy/(pi/a)),max(k_yy)/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[min(k_xx/(pi/a)):1:max(k_xx/(pi/a))], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[min(k_yy/(pi/a)):1:max(k_yy/(pi/a))], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
colormap(Purples6);

%% 第一布里渊区

% 计算倒格子的基矢量
b1 = 2 * pi * [r2(2), -r2(1)] / (r1(1)*r2(2) - r1(2)*r2(1));
b2 = 2 * pi * [-r1(2), r1(1)] / (r1(1)*r2(2) - r1(2)*r2(1));

% 生成倒格子的点
point_N = 5; % 在每个方向生成的点的数量
points = [];
for i = -point_N:point_N
    for j = -point_N:point_N
        point = i * b1 + j * b2;
        points = [points; point];
    end
end

% 计算到原点的距离
distances = sqrt(sum((points - [0,0]).^2, 2));

% 找到距离最小的6个点
[~, indices] = mink(distances, 7);
nearest_points = points(indices, :);

% 计算第一布里渊区的顶点
K = convhull(nearest_points);

% 绘制第一布里渊区
plot(nearest_points(K, 1)/(pi/a), nearest_points(K, 2)/(pi/a),':','Color','k');
K1=[K(1),K(3),K(5),K(1)];
K2=[K(2),K(4),K(6),K(2)];
plot(nearest_points(K1, 1)/(pi/a), nearest_points(K1, 2)/(pi/a),':','Color','k');
plot(nearest_points(K2, 1)/(pi/a), nearest_points(K2, 2)/(pi/a),':','Color','k');

% 绘制倒格子点
plot(points(:, 1)/(pi/a), points(:, 2)/(pi/a), '.','Color','black');

% 正六边形
n = 6;
radius = 4*sqrt(3)/3/a;
theta = linspace(0, 2*pi, n+1);
x = radius * cos(theta);
y = radius * sin(theta);
plot(x, y, '--','LineWidth',1.5,'Color',colorrd);

close(bar)%关闭进度条

色散关系（原子规范）

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clc
clear all

%% 参数
e_0=1;
a=sqrt(3)*e_0;
e1=e_0*[0,1]';
e2=e_0*[sqrt(3)/2,-0.5]';
e3=e_0*[-sqrt(3)/2,-0.5]';
a1=a*[1,0]';
a2=a*[1/2,-sqrt(3)/2]';
t=1;
%% 循环次数
count_x=500;
count_y=500;

%% k_x,k_y 取值
k_xx=4*linspace(-1*pi,1*pi,count_x)/a;
k_yy=4*linspace(-1*pi,1*pi,count_y)/a;

%% 颜色
colorrd=[207,108,82]/255;
coloryl=[241,141,0]/255;
colorbl=[109,152,165]/255;

%% 计算
bar = waitbar(0,'色散关系计算中...'); %显示进度条
for x = 1:count_x
    per=x/count_x;
    str=['色散关系计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1:count_y
        k_x=k_xx(x);
        k_y=k_yy(y);
        k=[k_x k_y];
        % Hamiltonian
        H=zeros(2);
        H(1,2)=t*exp(-1i*k*e1)+t*exp(-1i*k*e2)+t*exp(-1i*k*e3);
        H(2,1)=conj(H(1,2));
        E(x,y,:)=eig(H);
    end
end

%% 绘图
% 设置图窗
f1=figure(1);
position0=get(f1,'position');
set(f1,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

%结果
nexttile
pcolor(k_xx/(pi/a),k_yy/(pi/a),E(:,:,1)')
hold on
pcolor(k_xx/(pi/a),k_yy/(pi/a),E(:,:,2)')
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
clim([0,max(max(max(E)))])
load('colorData.mat');
axis([min(k_xx/(pi/a)),max(k_xx/(pi/a)),min(k_yy/(pi/a)),max(k_yy)/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[min(k_xx/(pi/a)):1:max(k_xx/(pi/a))], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[min(k_yy/(pi/a)):1:max(k_yy/(pi/a))], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
colormap(Purples6);

%% 第一布里渊区

% 计算倒格子的基矢量
b1 = 2 * pi * [a2(2), -a2(1)] / (a1(1)*a2(2) - a1(2)*a2(1));
b2 = 2 * pi * [-a1(2), a1(1)] / (a1(1)*a2(2) - a1(2)*a2(1));

% 生成倒格子的点
point_N = 5; % 在每个方向生成的点的数量
points = [];
for i = -point_N:point_N
    for j = -point_N:point_N
        point = i * b1 + j * b2;
        points = [points; point];
    end
end

% 计算到原点的距离
distances = sqrt(sum((points - [0,0]).^2, 2));

% 找到距离最小的6个点
[~, indices] = mink(distances, 7);
nearest_points = points(indices, :);

% 计算第一布里渊区的顶点
K = convhull(nearest_points);

% 绘制第一布里渊区
plot(nearest_points(K, 1)/(pi/a), nearest_points(K, 2)/(pi/a),':','Color','k');
K1=[K(1),K(3),K(5),K(1)];
K2=[K(2),K(4),K(6),K(2)];
plot(nearest_points(K1, 1)/(pi/a), nearest_points(K1, 2)/(pi/a),':','Color','k');
plot(nearest_points(K2, 1)/(pi/a), nearest_points(K2, 2)/(pi/a),':','Color','k');

% 绘制倒格子点
plot(points(:, 1)/(pi/a), points(:, 2)/(pi/a), '.','Color','black');

% 正六边形
n = 6;
radius = 4*sqrt(3)/3/a;
theta = linspace(0, 2*pi, n+1);
x = radius * cos(theta);
y = radius * sin(theta);
plot(x, y, '--','LineWidth',1.5,'Color',colorrd);

close(bar)%关闭进度条

贝里曲率（晶格规范）

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clc
clear all

%% 参数
e_0=1;
a=sqrt(3)*e_0;
a1=a*[1,0]';
a2=a*[1/2,-sqrt(3)/2]';
t=1;

% 颜色
colorrd = [207,108,82]/255;
coloryl = [241,141,0]/255;
colorbl = [109,152,165]/255;

% 循环次数
count_x = 200;
count_y = 200;

% 区间
[x_min,x_max]=deal(4*-pi/a,4*pi/a);
[y_min,y_max]=deal(4*-pi/a,4*pi/a);

%处理数据
delta_k_x = (x_max-x_min)/count_x;
delta_k_y = (y_max-y_min)/count_y;
k_x_valuex = (x_min:delta_k_x:x_max);
k_y_valuey = (y_min:delta_k_y:y_max);
% n = 1;

%% 计算
bar = waitbar(0,'贝里曲率计算中...'); %显示进度条
for x = 1: count_x+1
    per=x/(4*count_x);
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    k_x = k_x_valuex(x);
    for y = 1: count_y+1
        k_y = k_y_valuey(y);
        k = [k_x, k_y];
        % Hamiltonian
        H(1,2,x,y)=t+t*exp(-1i*k*a1)+t*exp(-1i*k*a2);
        H(2,1,x,y)=conj(H(1,2));
    end
end
for x = 1: count_x
    per=(count_x+x)/(4*count_x);;
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1: count_y
        H_k_x_delta_k_x(:,:,x,y) = H(:,:,x+1,y);
        H_k_y_delta_k_y(:,:,x,y) = H(:,:,x,y+1);
        H__k_x_k_y_delta_k_x_k_y(:,:,x,y) = H(:,:,x+1,y+1);
    end
end
H(:,:,:,count_y+1)=[];
H(:,:,count_x+1,:)=[];

for n = 1:2
for x = 1: count_x
    per=((n+1)*count_x+x)/(4*count_x);;
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1: count_y
        [vecs, Energy(x,y,:)] = eigen(H(:,:,x,y));
        [vecs_k_x_delta_k_x, Energy_k_x_delta_k_x(x,y,:)] = eigen(H_k_x_delta_k_x(:,:,x,y));
        [vecs_k_y_delta_k_y, Energy_k_y_delta_k_y(x,y,:)] = eigen(H_k_y_delta_k_y(:,:,x,y));
        [vecs__k_x_k_y_delta_k_x_k_y, Energy__k_x_k_y_delta_k_x_k_y(x,y,:)] = eigen(H__k_x_k_y_delta_k_x_k_y(:,:,x,y));

        % 归一化
        U_x(n) = dot(vecs(:,n), vecs_k_x_delta_k_x(:,n)) / abs(dot(vecs(:,n), vecs_k_x_delta_k_x(:,n)));
        U_y(n) = dot(vecs(:,n), vecs_k_y_delta_k_y(:,n)) / abs(dot(vecs(:,n), vecs_k_y_delta_k_y(:,n)));
        U_x_y(n) = dot(vecs_k_y_delta_k_y(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)) / abs(dot(vecs_k_y_delta_k_y(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)));
        U_y_x(n) = dot(vecs_k_x_delta_k_x(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)) / abs(dot(vecs_k_x_delta_k_x(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)));

        F_tilde(x,y,n) = log(U_x(n) * U_y_x(n) / (U_x_y(n) * U_y(n)));
        Berry_Curvature(x,y,n) = real(1i * F_tilde(x,y,n) / (delta_k_x * delta_k_y));
        Chern_number_point(x,y,n)=-F_tilde(x,y,n)/(2*pi*1i); % 从Field_strength求陈数
    end
end
Chern_number(n)=sum(Chern_number_point(:,:,n),"all")
end


%% 绘图
% 设置图窗
f1=figure(1);
position0=get(f1,'position');
set(f1,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

% 绘制曲率
nexttile
surf(k_x_valuex(1:count_x)/(pi/a), k_y_valuey(1:count_y)/(pi/a), Berry_Curvature(:,:,1))
hold on
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
load('colorData.mat');
axis([min(k_x_valuex(1:count_x)/(pi/a)),max(k_x_valuex(1:count_x)/(pi/a)),min(k_y_valuey(1:count_y)/(pi/a)),max(k_y_valuey(1:count_y))/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[x_min/(pi/a):1:x_max/(pi/a)], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[y_min/(pi/a):1:y_max/(pi/a)], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
view(-44.5,85);
load('colorData.mat');
colormap(Purples6);

f2=figure(2);
position0=get(f2,'position');
set(f2,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

nexttile
surf(k_x_valuex(1:count_x)/(pi/a), k_y_valuey(1:count_y)/(pi/a), Berry_Curvature(:,:,2))
hold on
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
load('colorData.mat');
axis([min(k_x_valuex(1:count_x)/(pi/a)),max(k_x_valuex(1:count_x)/(pi/a)),min(k_y_valuey(1:count_y)/(pi/a)),max(k_y_valuey(1:count_y))/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[x_min/(pi/a):1:x_max/(pi/a)], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[y_min/(pi/a):1:y_max/(pi/a)], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
view(-44.5,85);
colormap(Purples6);

close(bar)%关闭进度条
%% 求本征值并排序
function [vecs, Energy] = eigen(H)
    [v, E] = eig(H);
    [Energy, index] = sort(real(diag(E)));
    vecs = v(:, index);
end

贝里曲率（原子规范）

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clc
clear all

%% 参数
e_0=1;
a=sqrt(3)*e_0;
e1=e_0*[0,1]';
e2=e_0*[sqrt(3)/2,-0.5]';
e3=e_0*[-sqrt(3)/2,-0.5]';
t=1;

% 颜色
colorrd = [207,108,82]/255;
coloryl = [241,141,0]/255;
colorbl = [109,152,165]/255;

% 循环次数
count_x = 200;
count_y = 200;

% 区间
[x_min,x_max]=deal(2*-pi,2*pi);
[y_min,y_max]=deal(2*-pi,2*pi);

%处理数据
delta_k_x = (x_max-x_min)/count_x;
delta_k_y = (y_max-y_min)/count_y;
k_x_valuex = (x_min:delta_k_x:x_max);
k_y_valuey = (y_min:delta_k_y:y_max);
% n = 1;

%% 计算
bar = waitbar(0,'贝里曲率计算中...'); %显示进度条
for x = 1: count_x+1
    per=x/(4*count_x);
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    k_x = k_x_valuex(x);
    for y = 1: count_y+1
        k_y = k_y_valuey(y);
        k = [k_x, k_y];
        % Hamiltonian
        H(1,2,x,y)=t*exp(-1i*k*e1)+t*exp(-1i*k*e2)+t*exp(-1i*k*e3);
        H(2,1,x,y)=conj(H(1,2));
    end
end
for x = 1: count_x
    per=(count_x+x)/(4*count_x);;
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1: count_y
        H_k_x_delta_k_x(:,:,x,y) = H(:,:,x+1,y);
        H_k_y_delta_k_y(:,:,x,y) = H(:,:,x,y+1);
        H__k_x_k_y_delta_k_x_k_y(:,:,x,y) = H(:,:,x+1,y+1);
    end
end
H(:,:,:,count_y+1)=[];
H(:,:,count_x+1,:)=[];

for n = 1:2
for x = 1: count_x
    per=((n+1)*count_x+x)/(4*count_x);;
    str=['贝里曲率计算中...',num2str(100*per),'%']; % 百分比形式显示
    waitbar(per,bar,str)
    for y = 1: count_y
        [vecs, Energy(x,y,:)] = eigen(H(:,:,x,y));
        [vecs_k_x_delta_k_x, Energy_k_x_delta_k_x(x,y,:)] = eigen(H_k_x_delta_k_x(:,:,x,y));
        [vecs_k_y_delta_k_y, Energy_k_y_delta_k_y(x,y,:)] = eigen(H_k_y_delta_k_y(:,:,x,y));
        [vecs__k_x_k_y_delta_k_x_k_y, Energy__k_x_k_y_delta_k_x_k_y(x,y,:)] = eigen(H__k_x_k_y_delta_k_x_k_y(:,:,x,y));

        % 归一化
        U_x(n) = dot(vecs(:,n), vecs_k_x_delta_k_x(:,n)) / abs(dot(vecs(:,n), vecs_k_x_delta_k_x(:,n)));
        U_y(n) = dot(vecs(:,n), vecs_k_y_delta_k_y(:,n)) / abs(dot(vecs(:,n), vecs_k_y_delta_k_y(:,n)));
        U_x_y(n) = dot(vecs_k_y_delta_k_y(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)) / abs(dot(vecs_k_y_delta_k_y(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)));
        U_y_x(n) = dot(vecs_k_x_delta_k_x(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)) / abs(dot(vecs_k_x_delta_k_x(:,n), vecs__k_x_k_y_delta_k_x_k_y(:,n)));

        F_tilde(x,y,n) = log(U_x(n) * U_y_x(n) / (U_x_y(n) * U_y(n)));
        Berry_Curvature(x,y,n) = real(1i * F_tilde(x,y,n) / (delta_k_x * delta_k_y));
        Chern_number_point(x,y,n)=-F_tilde(x,y,n)/(2*pi*1i); % 从Field_strength求陈数
    end
end
Chern_number(n)=sum(Chern_number_point(:,:,n),"all")
end


%% 绘图
% 设置图窗
f1=figure(1);
position0=get(f1,'position');
set(f1,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

% 绘制曲率
nexttile
surf(k_x_valuex(1:count_x)/(pi/a), k_y_valuey(1:count_y)/(pi/a), Berry_Curvature(:,:,1))
hold on
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
load('colorData.mat');
axis([min(k_x_valuex(1:count_x)/(pi/a)),max(k_x_valuex(1:count_x)/(pi/a)),min(k_y_valuey(1:count_y)/(pi/a)),max(k_y_valuey(1:count_y))/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[x_min/(pi/a):1:x_max/(pi/a)], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[y_min/(pi/a):1:y_max/(pi/a)], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
view(-44.5,85);
load('colorData.mat');
colormap(Purples6);

f2=figure(2);
position0=get(f2,'position');
set(f2,'position',position0+[0*position0(3),0*position0(4),-1*position0(3)+1.05*position0(4),0*position0(4)]);

nexttile
surf(k_x_valuex(1:count_x)/(pi/a), k_y_valuey(1:count_y)/(pi/a), Berry_Curvature(:,:,2))
hold on
shading interp
grid off
set(gca,'linewidth',1)
set(gca,'boxstyle','full','box','on')
set(gca,'xticklabel','','yticklabel','','zticklabel','','xtick','','ytick','','ztick','')
xlabel('$k_{x}\ (\pi/a)$','Interpreter','latex','FontSize',22);
ylabel('$k_{y}\ (\pi/a)$','interpreter','latex','FontSize',22,'FontName','Arial')
load('colorData.mat');
axis([min(k_x_valuex(1:count_x)/(pi/a)),max(k_x_valuex(1:count_x)/(pi/a)),min(k_y_valuey(1:count_y)/(pi/a)),max(k_y_valuey(1:count_y))/(pi/a)]*1.05)
xtickangle(0);
set(gca,'xminortick','on');%小刻度打开
set(gca,'yminortick','on');%小刻度打开
set(gca,'ticklength',[0.015 0.025]);%刻度长度
set(gca, 'xtick',[x_min/(pi/a):1:x_max/(pi/a)], 'XTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
set(gca, 'ytick',[y_min/(pi/a):1:y_max/(pi/a)], 'yTickLabel', {'$-4$', '', '', '', '$0$', '', '', '','$4$'}, 'TickLabelInterpreter', 'latex', 'FontSize', 18)
view(-44.5,85);
colormap(Purples6);

close(bar)%关闭进度条
%% 求本征值并排序
function [vecs, Energy] = eigen(H)
    [v, E] = eig(H);
    [Energy, index] = sort(real(diag(E)));
    vecs = v(:, index);
end