致命错误：未捕获错误：在动态变量命名空间中找不到类

I have this main controller:

namespace App\Core;
/**
* Controller class
*/

class Controller
{
    /** @var View View The view object */
    public $View;
    public $templates;
    /**
     * Construct the (base) controller. This happens when a real controller is constructed, like in
     */
    public function __construct()
    {

    }

    public function loadModel($name) {

        $path = '\\App\\Front\\Model\\'.$name; // Not Work

        //$this->model = new \App\Front\Model\IndexModel(); Work

        $this->model = new $path;

        return $this->model;

    }
}

In IndexController I have:

namespace App\Front\Controller;

use App\Front\Model\IndexModel;

class IndexController extends \App\Core\Controller {

    public function index(){
        $this->loadModel('IndexModel()')->test();
    }
}

Now in action I see error:

Fatal error: Uncaught Error: Class '\App\Front\Model\IndexModel()' not found in /Applications/MAMP/htdocs/mvc/application/Core/Controller.php:64

how do fix error?