How access session username after session is authenticated in other controller

I am using Ember-simple-auth to authenticate my routes, and is working fine. I have:

login - login route
index - after login in ok

And i'm using the ember-cli-notification to pop up this message:

"Welcome USER NAME"

Like this, in IndexController:

export default Ember.Controller.extend({
  init () {
    this.notifications.addNotification({
      message: 'Welcome USER NAME',
      type: 'success',
      autoClear: true,
      clearDuration: 5000
    });
  }
});

I would like to ask... how can i access the properties of the current logged user? I'm in a complete different controller, so i don't have any idea in how can i do that...

And.. i would like to ask if possible.. i am using the init function for this.. am i doing it right?

Thanks.