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<p>: where  is the <a href="page.php?w=Hall_effect">Hall voltage</a>,  is the channel <a href="page.php?w=electric_current">current</a>,   is the <a href="page.php?w=elementary_charge">elementary charge</a> and  is the <a href="page.php?w=Planck_constant">Planck constant</a>. The divisor  can take on either integer  or fractional  values. Here,  is roughly but not exactly equal to the filling factor of <a href="page.php?w=Landau_levels">Landau levels</a>. The quantum Hall effect is referred to as the integer or fractional quantum Hall effect depending</p><p>
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