[qmeso-seminar] семинар сектора 31 января

[Mikhail Skvortsov]

                      СЕМИНАР СЕКТОРА КВАНТОВОЙ МЕЗОСКОПИКИ

                          пятница 31 января, 15:00, ИТФ


                              С. И. Дорожкин (ИФТТ)

               Flips of electric field in microwave-induced states
                        with spontaneously broken symmetry


We present new results on the bistability effect recently observed 
[Dorozhkin et
al., Nature Physics 7, 336 (2011)] in two-dimensional electron systems 
subjected
to the microwave radiation. The effect appears as switching between two 
states
with different electric potential distribution across a sample. Our 
results here
imply that the main difference between these two states is an opposite 
direction
of a long lengthscale electric field which arises spontaneously under 
conditions
when the observable magnetoresistance tends to zero. Although a 
possibility of
the field reversal is an inherent property of states with spontaneously 
broken
symmetry, so far such effect was never observed under stationary 
external
conditions.