Edit in JSFiddle

var myApp = angular.module('myApp', []);

myApp.controller('navCtrl', function ($scope) {
$scope.user = "";
});

myApp.controller('loginCtrl', function ($scope) {

});

//Recommendations:
/*

*/

<div ng-controller="navCtrl">
   <div>navCtrl text: {{user}}</div>
   <div ng-controller="loginCtrl">
        <div> loginCtrl text: {{user}}</div>
       <br/>
        <input ng-model="user"></input>
   </div>
</div>