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      <title>Quartz 4</title>
      <link>https://nanotheochem.github.io/the-grid</link>
      <description>Last 10 notes on Quartz 4</description>
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    <title>THE GRID</title>
    <link>https://nanotheochem.github.io/the-grid/</link>
    <guid>https://nanotheochem.github.io/the-grid/</guid>
    <description><![CDATA[  What this is THE GRID — public, perpetually unfinished notes on condensed-matter physics, electronic structure, and the methods I use day to day. ]]></description>
    <pubDate>Mon, 22 Jun 2026 11:29:40 GMT</pubDate>
  </item><item>
    <title>The Atlas</title>
    <link>https://nanotheochem.github.io/the-grid/atlas</link>
    <guid>https://nanotheochem.github.io/the-grid/atlas</guid>
    <description><![CDATA[  What this is The whole GRID as one tree, ordered by depth instead of topic. ]]></description>
    <pubDate>Mon, 22 Jun 2026 09:02:32 GMT</pubDate>
  </item><item>
    <title>Methods</title>
    <link>https://nanotheochem.github.io/the-grid/methods/</link>
    <guid>https://nanotheochem.github.io/the-grid/methods/</guid>
    <description><![CDATA[ Practical DFT and beyond — the machinery behind the physics. What I run, why, and where it lies to you. ]]></description>
    <pubDate>Mon, 22 Jun 2026 09:02:32 GMT</pubDate>
  </item><item>
    <title>Physics</title>
    <link>https://nanotheochem.github.io/the-grid/physics/</link>
    <guid>https://nanotheochem.github.io/the-grid/physics/</guid>
    <description><![CDATA[ Condensed-matter physics and many-body methods. ]]></description>
    <pubDate>Mon, 22 Jun 2026 09:02:32 GMT</pubDate>
  </item><item>
    <title>Mathematics</title>
    <link>https://nanotheochem.github.io/the-grid/mathematics/</link>
    <guid>https://nanotheochem.github.io/the-grid/mathematics/</guid>
    <description><![CDATA[ The backbone the physics leans on. Thin by design — these exist so the physics notes can point here instead of re-deriving. ]]></description>
    <pubDate>Sun, 21 Jun 2026 23:17:40 GMT</pubDate>
  </item><item>
    <title>Materials &amp; systems</title>
    <link>https://nanotheochem.github.io/the-grid/materials/</link>
    <guid>https://nanotheochem.github.io/the-grid/materials/</guid>
    <description><![CDATA[ The specific systems I compute — where the methods meet a real lattice. ]]></description>
    <pubDate>Sun, 21 Jun 2026 08:36:49 GMT</pubDate>
  </item><item>
    <title>Conventions</title>
    <link>https://nanotheochem.github.io/the-grid/conventions</link>
    <guid>https://nanotheochem.github.io/the-grid/conventions</guid>
    <description><![CDATA[ How this wiki is graded and wired. Mostly notes-to-self so the tree stays consistent. Complexity levels Every note carries exactly one level/* tag. ]]></description>
    <pubDate>Sun, 21 Jun 2026 05:48:18 GMT</pubDate>
  </item><item>
    <title>Perovskite structure (ABX₃)</title>
    <link>https://nanotheochem.github.io/the-grid/materials/perovskite-structure</link>
    <guid>https://nanotheochem.github.io/the-grid/materials/perovskite-structure</guid>
    <description><![CDATA[ The perovskite ABX_3 aristotype is the corner-sharing octahedral framework that organizes a huge slice of functional-materials physics: ferroelectricity, the manganite/cuprate oxides, and the halide photovoltaics. ]]></description>
    <pubDate>Sun, 21 Jun 2026 00:00:00 GMT</pubDate>
  </item><item>
    <title>Perovskite variants — double &amp; antiperovskites</title>
    <link>https://nanotheochem.github.io/the-grid/materials/perovskite-variants</link>
    <guid>https://nanotheochem.github.io/the-grid/materials/perovskite-variants</guid>
    <description><![CDATA[ Two structural derivatives of the parent perovskite structure reuse its corner-sharing octahedral framework but change what occupies the sites. ]]></description>
    <pubDate>Sun, 21 Jun 2026 00:00:00 GMT</pubDate>
  </item><item>
    <title>BdG &amp; para-Hermitian diagonalization</title>
    <link>https://nanotheochem.github.io/the-grid/mathematics/bogoliubov-de-gennes</link>
    <guid>https://nanotheochem.github.io/the-grid/mathematics/bogoliubov-de-gennes</guid>
    <description><![CDATA[ How to diagonalize a quadratic bosonic Hamiltonian that contains anomalous (pairing) terms \hat b^\dagger\hat b^\dagger and \hat b\,\hat b — the situation one always lands in after a Holstein–Primakoff expansion of a magnet, or for any Bogoliubov problem with a condensate. ]]></description>
    <pubDate>Sun, 21 Jun 2026 00:00:00 GMT</pubDate>
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