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Exchange operator

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1121: 1133: 25: 1601:. Therefore, it is always possible and usually most convenient to choose a basis in which the states are eigenstates of the exchange operator. Such a state is either completely symmetric under exchange of all identical bosons or completely antisymmetric under exchange of all identical fermions of the system. To do so for fermions, for example, the 1862: 1421: 1565: 1265: 208: 1667: 1144:
Exchange of two particles in 2 + 1 spacetime by rotation. The rotations are inequivalent, since one cannot be deformed into the other (without the worldlines leaving the plane, an impossibility in 2d space).
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for this case. The exchange operator is not well defined in a strictly 1-dimensional system, though there are constructions of 1-dimensional networks that behave as effective 2-dimensional systems.
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In 2 dimensions, the adiabatic exchange of particles is not necessarily possible. Instead, the eigenvalues of the exchange operator may be complex phase factors (in which case
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K. Kitaura; K. Morokuma (2004). "A new energy decomposition scheme for molecular interactions within the Hartree-Fock approximation".
2203: 42: 2227: 2180: 1154:, the exchange operator can represent a literal exchange of the positions of the pair of particles by motion of the particles in an 221: 108: 310: 417: 397: 89: 2142: 1594: 968: 265: 387: 61: 657: 46: 1661:
arising from the exchange statistics described above. In this method, one often defines an energetic exchange operator as:
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Bylander, D. M.; Kleinman, Leonard (1990). "Good semiconductor band gaps with a modified local-density approximation".
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R.K. Nesbet (1958). "The Heisenberg exchange operator for ferromagnetic and antiferromagnetic systems".
345: 330: 1120: 257: 2041: 1998: 2389: 2315: 2268: 2137: 1658: 1110: 906: 662: 574: 300: 2439: 1098: 1037: 761: 569: 487: 315: 295: 247: 1132: 2423: 2368: 2339: 2305: 1598: 482: 407: 340: 252: 1611: 1560:{\displaystyle {\hat {P}}\left|x_{1},x_{2}\right\rangle =\pm \left|x_{2},x_{1}\right\rangle \,.} 1429: 998: 2409: 82: 2331: 2296:
A.P. Polychronakos (1992). "Exchange Operator Formalism for Integrable Systems of Particles".
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Quantum mechanical operator interchanging particle states as arguments to a function
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Both signs are realized in nature. Particles satisfying the case of +1 are called
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acted upon by the exchange operator as functions of the electron positions, and
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operation. Consider two repeated operations of such a particle exchange:
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are bosons whereas all particles with half-integer spin are fermions.
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Exchange of Identical and Possibly Indistinguishable Particles
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Szépfalusy, P. (1957). "On a new exchange potential".
2107: 2087: 2044: 2001: 1961: 1925: 1873: 1670: 1614: 1576:, and particles satisfying the case of −1 are called 1468: 1432: 1276: 1175: 1049: 1001: 141: 2388:(1). Lincoln, Massachusetts, USA: Elsevier: 87–103. 1093:. Since the particles are identical, the notion of 49:. Unsourced material may be challenged and removed. 2120: 2093: 2073: 2030: 1983: 1947: 1911: 1856: 1629: 1559: 1447: 1415: 1259: 1085: 1016: 202: 1649:A modified exchange operator is defined in the 1086:{\displaystyle \left|x_{1},x_{2}\right\rangle } 1605:builds such a completely antisymmetric state. 2353:Acta Physica Academiae Scientiarum Hungaricae 969: 8: 197: 171: 1919:is the one-electron exchange operator, and 2240:International Journal of Quantum Chemistry 976: 962: 120: 2309: 2153:Exchange symmetry or permutation symmetry 2112: 2106: 2086: 2081:are the one-electron wavefunction of the 2062: 2049: 2043: 2019: 2006: 2000: 1972: 1960: 1936: 1924: 1900: 1887: 1876: 1875: 1872: 1847: 1838: 1830: 1816: 1803: 1790: 1777: 1772: 1765: 1764: 1752: 1739: 1723: 1710: 1697: 1684: 1673: 1672: 1669: 1616: 1615: 1613: 1586:dictates that all particles with integer 1553: 1542: 1529: 1503: 1490: 1470: 1469: 1467: 1434: 1433: 1431: 1402: 1389: 1366: 1353: 1333: 1332: 1318: 1305: 1290: 1279: 1278: 1275: 1246: 1233: 1210: 1197: 1177: 1176: 1174: 1072: 1059: 1048: 1003: 1002: 1000: 189: 178: 177: 163: 148: 140: 109:Learn how and when to remove this message 1593:The exchange operator commutes with the 2164: 1097:requires that the exchange operator be 145: 128: 2195:A modern approach to quantum mechanics 2222:(4th ed., Prentice Hall 1991) p.403. 2175:(4th ed., Prentice Hall 1991) p.262. 1912:{\displaystyle {\hat {K}}_{j}(x_{1})} 1459:of 1, which leaves the possibilities 7: 47:adding citations to reliable sources 1839: 508:Sum-over-histories (path integral) 194: 168: 124:Part of a series of articles about 14: 2074:{\displaystyle \phi _{j}(x_{2})} 2031:{\displaystyle \phi _{j}(x_{1})} 1455:is not only unitary but also an 1131: 1119: 1040:described by the joint position 23: 2143:Hamiltonian (quantum mechanics) 34:needs additional citations for 2068: 2055: 2025: 2012: 1978: 1965: 1942: 1929: 1906: 1893: 1881: 1822: 1809: 1796: 1783: 1758: 1745: 1729: 1716: 1703: 1690: 1678: 1621: 1475: 1439: 1338: 1284: 1182: 1008: 658:Relativistic quantum mechanics 190: 183: 164: 1: 698:Quantum statistical mechanics 2402:10.1016/0003-4916(58)90039-3 2410:"The Hartree-Fock Equation" 1657:, in order to estimate the 1030:quantum mechanical operator 668:Quantum information science 2482: 2328:10.1103/PhysRevLett.69.703 1630:{\displaystyle {\hat {P}}} 1448:{\displaystyle {\hat {P}}} 1108: 1017:{\displaystyle {\hat {P}}} 2442:Multiple Particle States 2281:10.1103/PhysRevB.41.7868 1984:{\displaystyle f(x_{2})} 1948:{\displaystyle f(x_{1})} 703:Quantum machine learning 456:Wheeler's delayed-choice 1637:is not Hermitian), see 1584:spin–statistics theorem 1032:that acts on states in 413:Leggett–Garg inequality 2192:J.S. Townsend (2000). 2122: 2121:{\displaystyle r_{12}} 2095: 2075: 2032: 1985: 1949: 1913: 1858: 1631: 1561: 1449: 1417: 1261: 1126:Anticlockwise rotation 1087: 1018: 204: 2252:10.1002/qua.560100211 2246:(2). Wiley: 325–340. 2123: 2096: 2076: 2033: 1991:are the one-electron 1986: 1950: 1914: 1859: 1632: 1562: 1450: 1418: 1262: 1088: 1019: 398:Elitzur–Vaidman 388:Davisson–Germer 205: 2138:Exchange interaction 2105: 2085: 2042: 1999: 1959: 1923: 1871: 1668: 1612: 1466: 1457:operator square root 1430: 1274: 1173: 1111:Exchange interaction 1047: 1026:permutation operator 999: 663:Quantum field theory 575:Consistent histories 212:Schrödinger equation 139: 43:improve this article 2426:Identical particles 2394:1958AnPhy...4...87N 2320:1992PhRvL..69..703P 2273:1990PhRvB..41.7868B 1782: 1651:Hartree–Fock method 1597:and is therefore a 1150:In three or higher 1038:identical particles 451:Stern–Gerlach 248:Classical mechanics 58:"Exchange operator" 2433:2013-07-01 at the 2365:10.1007/BF03156345 2118: 2091: 2071: 2028: 1981: 1945: 1909: 1854: 1768: 1627: 1599:conserved quantity 1557: 1445: 1413: 1257: 1138:Clockwise rotation 1083: 1014: 639:Von Neumann–Wigner 619:Objective-collapse 418:Mach–Zehnder 408:Leggett inequality 403:Franck–Hertz 253:Old quantum theory 200: 2466:Quantum chemistry 2382:Annals of Physics 2267:(11): 7868–7871. 2261:Physical Review B 2220:Quantum Chemistry 2173:Quantum Chemistry 2094:{\displaystyle j} 1884: 1836: 1681: 1655:quantum chemistry 1645:Quantum chemistry 1624: 1478: 1442: 1341: 1287: 1185: 1156:adiabatic process 1095:exchange symmetry 1011: 994:exchange operator 990:quantum mechanics 986: 985: 693:Scattering theory 673:Quantum computing 446:Schrödinger's cat 378:Bell's inequality 186: 161: 130:Quantum mechanics 119: 118: 111: 93: 2473: 2413: 2405: 2376: 2347: 2313: 2292: 2255: 2230: 2216: 2210: 2209: 2189: 2183: 2169: 2148:Coulomb operator 2127: 2125: 2124: 2119: 2117: 2116: 2100: 2098: 2097: 2092: 2080: 2078: 2077: 2072: 2067: 2066: 2054: 2053: 2037: 2035: 2034: 2029: 2024: 2023: 2011: 2010: 1990: 1988: 1987: 1982: 1977: 1976: 1954: 1952: 1951: 1946: 1941: 1940: 1918: 1916: 1915: 1910: 1905: 1904: 1892: 1891: 1886: 1885: 1877: 1863: 1861: 1860: 1855: 1853: 1852: 1851: 1842: 1837: 1835: 1834: 1825: 1821: 1820: 1808: 1807: 1795: 1794: 1781: 1776: 1766: 1757: 1756: 1744: 1743: 1728: 1727: 1715: 1714: 1702: 1701: 1689: 1688: 1683: 1682: 1674: 1636: 1634: 1633: 1628: 1626: 1625: 1617: 1566: 1564: 1563: 1558: 1552: 1548: 1547: 1546: 1534: 1533: 1513: 1509: 1508: 1507: 1495: 1494: 1480: 1479: 1471: 1454: 1452: 1451: 1446: 1444: 1443: 1435: 1422: 1420: 1419: 1414: 1412: 1408: 1407: 1406: 1394: 1393: 1376: 1372: 1371: 1370: 1358: 1357: 1343: 1342: 1334: 1328: 1324: 1323: 1322: 1310: 1309: 1295: 1294: 1289: 1288: 1280: 1266: 1264: 1263: 1258: 1256: 1252: 1251: 1250: 1238: 1237: 1220: 1216: 1215: 1214: 1202: 1201: 1187: 1186: 1178: 1160:parity inversion 1135: 1123: 1092: 1090: 1089: 1084: 1082: 1078: 1077: 1076: 1064: 1063: 1024:, also known as 1023: 1021: 1020: 1015: 1013: 1012: 1004: 978: 971: 964: 605:Superdeterminism 258:Bra–ket notation 209: 207: 206: 201: 193: 188: 187: 179: 167: 162: 160: 149: 121: 114: 107: 103: 100: 94: 92: 51: 27: 19: 2481: 2480: 2476: 2475: 2474: 2472: 2471: 2470: 2456: 2455: 2435:Wayback Machine 2420: 2408: 2379: 2350: 2298:Phys. Rev. Lett 2295: 2258: 2237: 2234: 2233: 2217: 2213: 2206: 2191: 2190: 2186: 2170: 2166: 2161: 2134: 2108: 2103: 2102: 2083: 2082: 2058: 2045: 2040: 2039: 2015: 2002: 1997: 1996: 1968: 1957: 1956: 1932: 1921: 1920: 1896: 1874: 1869: 1868: 1843: 1826: 1812: 1799: 1786: 1767: 1748: 1735: 1719: 1706: 1693: 1671: 1666: 1665: 1659:exchange energy 1647: 1610: 1609: 1603:antisymmetrizer 1538: 1525: 1524: 1520: 1499: 1486: 1485: 1481: 1464: 1463: 1428: 1427: 1398: 1385: 1384: 1380: 1362: 1349: 1348: 1344: 1314: 1301: 1300: 1296: 1277: 1272: 1271: 1242: 1229: 1228: 1224: 1206: 1193: 1192: 1188: 1171: 1170: 1148: 1147: 1146: 1145: 1141: 1140: 1139: 1136: 1128: 1127: 1124: 1113: 1107: 1068: 1055: 1054: 1050: 1045: 1044: 997: 996: 982: 953: 952: 951: 716: 708: 707: 653: 652:Advanced topics 645: 644: 643: 595:Hidden-variable 585:de Broglie–Bohm 564: 562:Interpretations 554: 553: 552: 522: 514: 513: 512: 470: 462: 461: 460: 427: 383:CHSH inequality 372: 364: 363: 362: 291:Complementarity 285: 277: 276: 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625: 624:Quantum logic 622: 620: 617: 615: 612: 606: 603: 602: 601: 598: 597: 596: 593: 591: 588: 586: 583: 581: 578: 576: 573: 571: 568: 567: 563: 558: 557: 549: 546: 544: 541: 539: 536: 534: 531: 529: 526: 525: 518: 517: 509: 506: 504: 501: 499: 496: 494: 491: 489: 486: 484: 481: 480: 476: 473: 472: 466: 465: 457: 454: 452: 449: 447: 444: 443: 437: 434: 433: 432: 429: 428: 424: 421: 419: 416: 414: 411: 409: 406: 404: 401: 399: 396: 394: 391: 389: 386: 384: 381: 379: 376: 375: 368: 367: 357: 354: 353: 352: 351:Wave function 349: 347: 344: 342: 339: 337: 334: 332: 331:Superposition 329: 327: 324: 322: 319: 317: 314: 312: 309: 307: 304: 302: 299: 297: 294: 292: 289: 288: 281: 280: 272: 269: 267: 264: 263: 259: 256: 254: 251: 249: 246: 245: 239: 238: 233: 230: 228: 225: 223: 220: 219: 218: 217: 213: 180: 174: 157: 154: 150: 142: 135: 134: 131: 127: 123: 122: 113: 110: 102: 99:February 2016 91: 88: 84: 81: 77: 74: 70: 67: 63: 60: â€“  59: 55: 54:Find sources: 48: 44: 38: 37: 32:This article 30: 26: 21: 20: 2448: 2441: 2440:Chapter 12, 2425: 2385: 2381: 2356: 2352: 2301: 2297: 2264: 2260: 2243: 2239: 2219: 2214: 2194: 2187: 2172: 2167: 1866: 1648: 1607: 1592: 1577: 1571: 1569: 1425: 1149: 1105:Construction 1025: 993: 987: 533:Klein–Gordon 469:Formulations 306:Energy level 301:Entanglement 284:Fundamentals 271:Interference 222:Introduction 105: 96: 86: 79: 72: 65: 53: 41:Please help 36:verification 33: 2451:, J. Denker 2428:, P. Haynes 1595:Hamiltonian 1426:Therefore, 922:von Neumann 907:Schrödinger 683:EPR paradox 614:Many-worlds 548:Schrödinger 503:Schrödinger 498:Phase-space 488:Interaction 393:Double-slit 371:Experiments 346:Uncertainty 316:Nonlocality 311:Measurement 296:Decoherence 266:Hamiltonian 2159:References 1152:dimensions 1034:Fock space 917:Sommerfeld 832:Heisenberg 827:Gutzwiller 767:de Broglie 715:Scientists 629:Relational 580:Copenhagen 483:Heisenberg 341:Tunnelling 242:Background 69:newspapers 2373:124672448 2047:ϕ 2004:ϕ 1882:^ 1779:∗ 1770:ϕ 1762:∫ 1737:ϕ 1679:^ 1622:^ 1518:± 1476:^ 1440:^ 1339:^ 1285:^ 1183:^ 1009:^ 947:Zeilinger 792:Ehrenfest 521:Equations 198:⟩ 195:Ψ 184:^ 172:⟩ 169:Ψ 146:ℏ 2460:Category 2431:Archived 2344:14319416 2336:10047011 2132:See also 1579:fermions 1550:⟩ 1511:⟩ 1410:⟩ 1374:⟩ 1326:⟩ 1254:⟩ 1218:⟩ 1080:⟩ 872:Millikan 797:Einstein 782:Davisson 737:Blackett 722:Aharonov 590:Ensemble 570:Bayesian 475:Overview 356:Collapse 336:Symmetry 227:Glossary 2390:Bibcode 2316:Bibcode 2289:9993089 2269:Bibcode 1582:. The 1099:unitary 1028:, is a 912:Simmons 902:Rydberg 867:Moseley 847:Kramers 837:Hilbert 822:Glauber 817:Feynman 802:Everett 772:Compton 543:Rydberg 232:History 83:scholar 2371:  2342:  2334:  2287:  2226:  2202:  2179:  1867:where 1573:bosons 992:, the 942:Zeeman 937:Wigner 887:Planck 857:Landau 842:Jordan 493:Matrix 423:Popper 85:  78:  71:  64:  56:  2369:S2CID 2340:S2CID 2306:arXiv 1639:anyon 897:Raman 882:Pauli 877:Onnes 812:Fermi 787:Debye 777:Dirac 742:Bloch 732:Bethe 600:Local 538:Pauli 528:Dirac 326:State 90:JSTOR 76:books 2424:2.3. 2332:PMID 2285:PMID 2224:ISBN 2200:ISBN 2177:ISBN 2038:and 1588:spin 932:Wien 927:Weyl 892:Rabi 862:Laue 852:Lamb 807:Fock 762:Bose 757:Born 752:Bohr 747:Bohm 727:Bell 62:news 2398:doi 2361:doi 2324:doi 2277:doi 2248:doi 1653:of 1162:or 988:In 45:by 2462:: 2396:. 2384:. 2367:. 2355:. 2338:. 2330:. 2322:. 2314:. 2302:69 2300:. 2283:. 2275:. 2265:41 2263:. 2244:10 2242:. 2114:12 1832:12 1101:. 2412:. 2404:. 2400:: 2392:: 2386:4 2375:. 2363:: 2357:7 2346:. 2326:: 2318:: 2308:: 2291:. 2279:: 2271:: 2254:. 2250:: 2208:. 2110:r 2089:j 2069:) 2064:2 2060:x 2056:( 2051:j 2026:) 2021:1 2017:x 2013:( 2008:j 1979:) 1974:2 1970:x 1966:( 1963:f 1955:, 1943:) 1938:1 1934:x 1930:( 1927:f 1907:) 1902:1 1898:x 1894:( 1889:j 1879:K 1849:2 1845:x 1840:d 1828:r 1823:) 1818:2 1814:x 1810:( 1805:i 1801:f 1797:) 1792:2 1788:x 1784:( 1774:j 1759:) 1754:1 1750:x 1746:( 1741:j 1733:= 1730:) 1725:1 1721:x 1717:( 1712:i 1708:f 1704:) 1699:1 1695:x 1691:( 1686:j 1676:K 1619:P 1555:. 1544:1 1540:x 1536:, 1531:2 1527:x 1522:| 1515:= 1505:2 1501:x 1497:, 1492:1 1488:x 1483:| 1473:P 1437:P 1404:2 1400:x 1396:, 1391:1 1387:x 1382:| 1378:= 1368:1 1364:x 1360:, 1355:2 1351:x 1346:| 1336:P 1330:= 1320:2 1316:x 1312:, 1307:1 1303:x 1298:| 1292:2 1282:P 1248:1 1244:x 1240:, 1235:2 1231:x 1226:| 1222:= 1212:2 1208:x 1204:, 1199:1 1195:x 1190:| 1180:P 1074:2 1070:x 1066:, 1061:1 1057:x 1052:| 1006:P 977:e 970:t 963:v 191:| 181:H 175:= 165:| 158:t 155:d 151:d 143:i 112:) 106:( 101:) 97:( 87:· 80:· 73:· 66:· 39:.

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Quantum mechanics
Schrödinger equation
Introduction
Glossary
History
Classical mechanics
Old quantum theory
Bra–ket notation
Hamiltonian
Interference
Complementarity
Decoherence
Entanglement
Energy level
Measurement
Nonlocality
Quantum number
State
Superposition

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