Phys. Rev. Lett. 90, 046807 (2003) [4 pages]Evidence for a New Dissipationless Effect in 2D Electronic TransportReceived 6 September 2002; published 30 January 2003 In an ultraclean 2D electron system (2DES) subjected to crossed millimeterwave (30–150 GHz) and weak (B<2 kG) magnetic fields, a series of apparently dissipationless states emerges as the system is detuned from cyclotron resonances. Such states are characterized by an exponentially vanishing low-temperature diagonal resistance and a classical Hall resistance. The activation energies associated with such states exceed the Landau level spacing by an order of magnitude. Our findings are likely indicative of a collective ground state previously unknown for 2DES. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.046807
DOI:
10.1103/PhysRevLett.90.046807
PACS:
73.40.–c, 73.21.–b, 73.43.–f
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