Finding literature

Why this matters

Before starting any project, a scientist asks: what is already known? Repeating work that was published ten years ago wastes months. Finding the right five papers, especially a recent reviewAn article that summarises a field and cites its key papers; a good starting point for a search., is often the fastest way into a new topic. Literature searching is a skill, and two free tools cover most needs in physical science: Google ScholarA free search engine for journal articles, preprints, theses, books and conference papers. and arXivA free preprint server run by Cornell University, organised by category such as cond-mat..

Google Scholar

Google Scholar indexes journal articles, preprints, theses, books and conference papers across all fields. Useful features:

• Exact phrases: put quotation marks around a phrase, such as "solid electrolyte", to require those words together.
• Exclude words: a minus sign removes results, for example graphene -oxide.
• Author search: author:"A Smith" limits results to an author.
• Title-only search: start with allintitle: to require every term in the title.
• Date filter: the left-hand menu limits results to recent years.
• Cited byA Google Scholar link to newer papers that cite a result, used to move forward in time.: shows newer papers that cite a result, which is how you move forward in time from a classic paper.
• Related articles: finds papers similar to one you like.
• Alerts: emails you when new papers match a search.
• Cite: produces a formatted reference you can copy.

Results are ranked partly by citations, so older papers float to the top. Use the date filter to find recent work.

arXiv

arXiv is a free preprint server run by Cornell University. Physicists, mathematicians and many materials scientists post papers there, often before or at the same time as journal submission. It is organised by category; for example cond-mat (condensed matter, which includes materials), physics.chem-ph (chemical physics), quant-ph (quantum physics) and astro-ph (astrophysics).

Things to know:

• arXiv papers are moderated for basic suitability but are not necessarily peer reviewed.
• Each paper's abstract page shows its versions (v1, v2...) and, once published, often a journal reference or DOI.
• Daily listings of new submissions per category are a common way researchers keep up.

Chemistry has its own preprint server, ChemRxiv, which works in a similar way. Checked on 2026-10-23.

Getting the full text

Many journal articles are behind paywalls. Legal routes include: your university library, which subscribes to many journals; the arXiv or author-posted version; open-access journals; and tools like Unpaywall, which find legal free versions. You can also email the corresponding author; most are happy to share.

Worked example: starting a search

Topic: "How does temperature affect sodium-ion battery performance?"

1. Terms: "sodium-ion battery", temperature, "low temperature", performance, review.
2. Search: "sodium-ion battery" "low temperature" review on Google Scholar, filtered to the last five years. A recent review appears near the top.
3. Read the review first. It summarises the field and cites the key papers, so its reference list becomes your reading list.
4. Go forward in time: open "Cited by" on the review to find papers published after it.
5. Check arXiv: search sodium-ion low temperature and look in the cond-mat and physics results for the newest preprints.
6. Record: keep a table or use a free reference manager (such as Zotero) with authors, year, title, source and a one-line note.

Judging what you find

• Prefer recent reviews for orientation and original research papers for specific results.
• Check whether a preprint has since been published, and whether results have been reproduced by other groups.
• Watch for predatory journalsUnfamiliar journals that promise very fast publication for a fee without proper review.: unfamiliar journals that promise very fast publication for a fee. Ask a librarian or mentor if unsure.
• Citation counts show attention, not correctness.

Common mistakes

• Searching only one term. Fields use different words for the same idea; try synonyms.
• Reading only the most cited papers. They are often old; filter by date.
• Skipping review articles. A good review can save weeks.
• Losing track of sources. Record every useful paper as you find it.
• Treating preprints as settled. Check for a published version and later work.

Quick recap

• Google Scholar: quotation marks, minus, author and title operators, date filter, Cited by, alerts.
• arXiv: free preprints by category; not necessarily peer reviewed; check for a journal reference.
• Start with a recent review, move forward with Cited by, and record every source.

Try it

Open the Do tab and run a small literature search with Google Scholar and arXiv.