Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-31
Nature Physics, Vol 2 No 7, 452 (2006) (published online: 4 June 2006)
Physics
Condensed Matter
Strongly Correlated Electrons
Some typos corrected and 2 references added. Final version with minor editoriol revisions published in Nature Physics
Scientific paper
10.1038/nphys322
The melting temperature ($T_m$) of a solid is generally determined by the pressure applied to it, or indirectly by its density ($n$) through the equation of state. This remains true even for helium solids\cite{wilk:67}, where quantum effects often lead to unusual properties\cite{ekim:04}. In this letter we present experimental evidence to show that for a two dimensional (2D) solid formed by electrons in a semiconductor sample under a strong perpendicular magnetic field\cite{shay:97} ($B$), the $T_m$ is not controlled by $n$, but effectively by the \textit{quantum correlation} between the electrons through the Landau level filling factor $\nu$=$nh/eB$. Such melting behavior, different from that of all other known solids (including a classical 2D electron solid at zero magnetic field\cite{grim:79}), attests to the quantum nature of the magnetic field induced electron solid. Moreover, we found the $T_m$ to increase with the strength of the sample-dependent disorder that pins the electron solid.
Chen Yong P.
Engel Lloyd W.
Lewis Myron R.
Pfeiffer Loren N.
Sambandamurthy G.
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