Quite generally, an insulator is theoretically defined by a vanishingconductivity tensor at the absolute zero of temperature. In classicalinsulators, such as band insulators, vanishing conductivities lead to divergingresistivities. In other insulators, in particular when a high magnetic field(B) is added, it is possible that while the magneto-resistance diverges, theHall resistance remains finite, which is known as a Hall insulator. In thisletter we demonstrate experimentally the existence of another, more exotic,insulator. This insulator, which terminates the quantum Hall effect series in atwo-dimensional electron system, is characterized by a Hall resistance which isapproximately quantized in the quantum unit of resistance h/e^2. This insulatoris termed a quantized Hall insulator. In addition we show that for the samesample, the insulating state preceding the QHE series, at low-B, is of the HIkind.
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机译：通常，绝缘体理论上是由温度绝对为零时消失的电导率张量定义的。在经典的绝缘子中，例如带状绝缘子，电导率消失会导致电阻变化。在其他绝缘子中，特别是当添加高磁场（B）时，有可能在磁阻发散的同时霍尔电阻保持有限，这被称为霍尔绝缘子。在本文中，我们将通过实验证明存在另一种更奇特的绝缘子。该绝缘体终止了二维电子系统中的量子霍耳效应系列，其特征在于以电阻h / e ^ 2的量子单位近似量化的霍尔电阻。该绝缘子称为量化霍尔绝缘子。此外，我们表明，对于同一样品，在低B的QHE系列之前的绝缘状态为HIkind。
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