Microwave spectroscopic observation of distinct electron solid phases in wide quantum wells.

Abstract:

:In high magnetic fields, two-dimensional electron systems can form a number of phases in which interelectron repulsion plays the central role, since the kinetic energy is frozen out by Landau quantization. These phases include the well-known liquids of the fractional quantum Hall effect, as well as solid phases with broken spatial symmetry and crystalline order. Solids can occur at the low Landau-filling termination of the fractional quantum Hall effect series but also within integer quantum Hall effects. Here we present microwave spectroscopy studies of wide quantum wells that clearly reveal two distinct solid phases, hidden within what in d.c. transport would be the zero diagonal conductivity of an integer quantum-Hall-effect state. Explanation of these solids is not possible with the simple picture of a Wigner solid of ordinary (quasi) electrons or holes.

journal_name

Nat Commun

journal_title

Nature communications

authors

Hatke AT,Liu Y,Magill BA,Moon BH,Engel LW,Shayegan M,Pfeiffer LN,West KW,Baldwin KW

doi

10.1038/ncomms5154

subject

Has Abstract

pub_date

2014-06-20 00:00:00

pages

4154

issn

2041-1723

pii

ncomms5154

journal_volume

5

pub_type

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