Evidence for a new dissipationless effect in 2D electronic transport

Phys Rev Lett. 2003 Jan 31;90(4):046807. doi: 10.1103/PhysRevLett.90.046807. Epub 2003 Jan 30.


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.